CN1440180A - 112 testboard gating array - Google Patents

Abstract

A matrix for selecting lines of 112 testing platform is characterized in that it is constituted by 1-32 frames LAMS for selecting lines, on which each are mounted a master board LAMM for selecting lines, a board CTP for communication controlling, self-testing and power source, 18-19 boards L16 for selecting 16 lines and a matrix board M32 for selecting 32 lines. The connectors for shorting SHC and passive connecting board STC for self-testing are inserted in the shocket positioned in the back of the board L16 for selecting 16 lines. This invention can ensure that the switching-in does not affect the current operation, and any circuit board can be inserted in and pulled out in hot-line without impairment to normal operation.

Description

Subscriber line test platform route selection matrix

Affiliated technical field

The present invention relates to a kind of matrix, particularly a kind of subscriber line test platform route selection matrix.

Background technology

Telecommunications subscriber line test platform need be tested local side and ustomer premises access equipment, subscribers feeder, to determine guilty culprit.In recent years along with the development of broadband networks, ADSL user is more and more, and original subscriber line test platform can not testing ADSL, needs to be equipped with special-purpose ADSL measuring head, for numerous users being tested, need to use the route selection relay matrix of front end with a spot of measuring head.But import equipment costs an arm and a leg, and circuit board can not warm swap.

Goal of the invention

The object of the present invention is to provide a kind of any circuit board all can charged plug and do not influence the user and normally use, minimum capacity is 304 users of 1 measuring head service, and heap(ed) capacity is 1 subscriber line test platform route selection matrix of serving unlimited a plurality of users with the mode of cascade to a plurality of measuring heads.

Summary of the invention

Purpose of the present invention can reach by following measure: a kind of subscriber line test platform route selection matrix, it is characterized in that: constitute by 1～32 route selection frame LAMS, be equipped with a route selection frame motherboard LAMM on each route selection frame LAMS, assigned a Control on Communication, test oneself and power panel CTP, 18-19 piece 16 line selection line plate L16,32 tunnel route selection matrix plate M32, Control on Communication, test oneself and power panel CTP provides the power supply of whole route selection frame LAMS, there is the RS-485 mouth to communicate by letter with host computer, and to 32 tunnel route selection matrix plate M32 on the whole frame, 16 line selection line plate L16 control and test oneself, 32 tunnel route selection matrix plate M32 input is the line that each route selection frame LAMS is chosen, output to measuring head, 16 line selection line plate L16 can be subjected to CTP control route selection, all L16 can only choose one the tunnel simultaneously on each frame, on the socket at the 16 line selection line plate L16 back sides, be inserted with short circuit connector SHC and the passive connecting plate STC that tests oneself, short circuit connector SHC uses when warm swap 16 line selection line plate L16, being used for 16 corresponding with it route roads is communicated with and is normal operating condition, the passive connecting plate STC that tests oneself can be all local side A lines of 16 tunnel of 16 line selection line plate L16, the B line, user side A line, the B line separately and to connect be four buses, and outgoing cable is inserted into Control on Communication, test oneself and power panel CTP, 16 line selection line plate L16 and 32 tunnel route selection matrix plate M32 are tested.

Purpose of the present invention can also reach by following measure; Before measuring head, can be provided with two groups of terminal emulation plate TE2, and by Control on Communication, test oneself and power panel CTP control, cooperate measuring head to use.Control on Communication, test oneself and power panel CTP comprises single-chip microprocessor MCU, the RS-485 interface, the parallel bus drive circuit, electrify restoration circuit, L16/M32 relay contact contact resistance test circuit, bouncing pilotage is imported 485 port addresss, drive circuit, power supply/indicator light circuit,-48V changes the 5V switching power circuit, user side and local side link tester are crossed L16/M32 relay contact contact resistance test circuit test result are delivered to single-chip microprocessor MCU, single-chip microcomputer is sent to 32 tunnel route selection matrix plate M32 and terminal emulation plate TE2 to clock data, and control signal is delivered to 16 line selection line plate L16 by the parallel bus drive circuit, bouncing pilotage imports 485 port addresss and electrify restoration circuit all links to each other with single-chip microprocessor MCU, and the signal of single-chip microprocessor MCU output is also delivered to power supply/communication indicator light circuit by drive circuit.32 tunnel route selection matrix plates comprise CPLD circuit, RC monostable trigger-action circuit, communication, three kinds of pattern indicator light circuits, drive circuit, 32 relays, the CPLD circuit links to each other with single-chip microprocessor MCU by the Serial Control line, and link to each other with the RC monostable trigger-action circuit, the signal one tunnel of CPLD circuit output is delivered to communication, three kinds of pattern indicator light circuits, and 32 relays are delivered to by drive circuit in another road.16 line selection line plate L16 comprise by plate address comparison circuit, 4-16 decoder, 32 CPLD circuit that 2 input AND circuit are formed, and drive circuit, 32 are grabbed line relay, are grabbed the line indicator light circuit, the output one tunnel of plate address comparison circuit is delivered to and is grabbed the line indicator light, the 4-16 decoder is delivered on another road, 32 2 input AND circuit are delivered in the output of 4-16 decoder, and the signal of 32 input AND circuit output is delivered to 32 by drive circuit and grabbed line relay.

The present invention has following advantage compared to existing technology:

1, assurance business is not interrupted: adopt carrier-class integrated circuit board designing technique, by the external short-circuiting device of row's formula, can not interrupt realizing on-line maintenance under the normal situation about using of subscriber's line, all integrated circuit boards can charged hot plug.

2, assurance business is not disturbed: the control logic of each integrated circuit board adopts the address decoding logical design of mutual exclusion, guarantees that every test bus only chooses a pair of subscribers feeder.

3, configuration is flexible: adopt the capacity extension technology of level networking, a matrix can expand to and can connect 32 test bus and 9712 pairs of subscribers feeders, and every test bus all can be chosen arbitrary subscribers feeder arbitrarily.

Description of drawings

Figure 1A is a system principle block diagram of the present invention;

Fig. 1 is for only there being the logic block-diagram of a route selection frame (LAMS);

Fig. 2 is the logic block-diagram that two 32 route selection frames (LAMS) are formed a cover system;

Fig. 3 is the logic connection layout of many cover systems;

Fig. 4 is the panel figure of route selection frame;

Fig. 5 is the front schematic view of route selection frame motherboard (LAMM);

Fig. 6 is the schematic rear view of route selection frame motherboard (LAMM);

Fig. 7 is the structure connection diagram that a plurality of route selection frames (LAMS) are formed a cover system;

Fig. 8 is Control on Communication, test oneself and the functional-block diagram of power panel CTP;

Fig. 9 is the functional-block diagram of 32 tunnel route selection matrix plate M32;

Figure 10 is the functional-block diagram of 16 line selection line plate L16;

Figure 11 is 16 line selection line plate L16 relay finding circuit figure;

Figure 12 is the functional-block diagram of terminal emulation plate TE2.

Embodiment

The present invention is described in further detail below in conjunction with accompanying drawing (embodiment):

With reference to Figure 1A ~ Fig. 7, the present invention is made of 1 ~ 32 route selection frame LAMS, is equipped with a motherboard LAMM on each route selection frame LAMS; Assigned a Control on Communication, tested oneself and power panel CTP; 18 ~ 19 16 line selection line plate L16; 32 tunnel route selection matrix plate M32; Two groups of terminal emulation point plate TE2; On the socket at the back side of L16, be inserted with short circuit connector SHC and the passive connecting plate STC that tests oneself.

Among Fig. 1,16 ~ 304 lines use a measuring head.

Among Fig. 2,305 ~ 9216 lines, 1 ~ 32 (generally only use 1 ~ several) measuring head, but the measuring head flexible allocation is tested 32 frames.

Among Fig. 3, greater than 9216 lines, the system of the above-mentioned Fig. 2 of the many covers of use connects with the mode of M32 cascade.

Among Fig. 4 ~ Fig. 7, each LAMS frame has 20 slots (1 to No. 20), and the 1st the fixing CTP that inserts can insert M32 or TE2, also can insert L16 for the 2nd.Can only insert L16 for the 3rd to 20.Each L16 can insert SHC behind to a socket should be arranged.

A system is made up of 32 LAMS at most, and their annexation as shown in the figure.Wherein-and 48V power supply, RS-485 be bus, and all frames are all in parallel.Tested subscribers feeder is then received on the distributing frame, omits among the figure, has only drawn the line between M32, L16, TE2, the CTP under certain conditions.6 LAMS are arranged this moment, and all L16 sticks with, and wherein two LAMS have inserted M32-C, have inserted TE2 for 3, have connect 5 measuring heads.For convenient with the aid of pictures, should cable usefulness straight line and the curve representation of cloth in the frame wire casing.

The figure cathetus is represented the line that L16 chose on each frame, is input to M32, outputs to TE2 after selecting through M32, outputs to measuring head (black curve) from TE2 again.

The system configuration method

System need be equipped with the transducer of a PC and a RS-232 commentaries on classics RS-485, controls maximum 128 LAMS frames.As surpassing 128 LAMS, can use another serial ports of PC, perhaps join a PC in addition.According to user's demand, 32 LAMS frames of the total line traffic control of general 1 RS-485.The collocation method of LAMS and institute's plate thereof and part exemplary such as table 1.

The quantity that needs to be equipped with SHC equals to pull up the quantity of keeping in repair L16 simultaneously.

Table 1 LAMS and each plank configuration quantity under different situations

User's request		Equipment disposition					Remarks
								Test line number (N)	Measuring head number (M)	LAMS number=CTP number (P)	L16 number (Q)	M32 number and type (R)		TE2 number (S depends on the needs of measuring head)
4609～9216	Less than 32 and P	Depend on N (17～32)	Depend on N (289～576)	The M piece	?M32-A	0~M/2(S+ R＜＝P)									More than 4608 lines
							Example: 9216	????1	????32	????576	1	????0～1	Single measuring head is surveyed 32 frames
Example: 9216	??20	????32	????576	20		????0~10
							Example: 5000	??10	????18	????313	10	????0～5
?2305～4608	Less than 16 and P	Depend on N (9～16)	Depend on N (145～288)	The M/2 piece		??M32-B								0～M/2 (S+R＜＝P)	Intermediate size
					Example: 4605		??10	????16	????288	????5	????0～5
Example: 2400	????8	????9	????150	????4									????0～4
					Example: 4605		????1	????16	????288	????1	????0～1	Single measuring head is surveyed 16 frames

????305????～ 2304	Less than 8 and P	Depend on N (2～8)	Depend on N (19～144)	The M/4 piece	?M32-C	0～M/2 (S+R＜＝P)	Than low capacity
								Example: 2300	????7	????8	????144	2	????0～4
Example: 2300	????1	????8	????144	1		????0～1	Single measuring head is surveyed 8 frames
								Example: 1000	????2	????4	????63	1	????0～1
Example: 2300	????4	????8	????144	1		????0～2
								????1～304	????1	????1	Depend on N (1 ~ 19)	????0		????0~1	(minimum capacity) single frame list measuring head connection
Example: 200	????1	????1	????13	????0		????0～1

Annotate:

A, all user tests in each LAMS are had alternative, can only survey one the tunnel simultaneously in the frame;

B, the test of different LAMS is not had alternative, only be subject to the measuring head that is connected and whether taken by other frame;

Equate with required LAMS quantity if c user is equipped with measuring head quantity, then need not to adopt M32, directly adopt the connection of several groups of single frame list measuring heads, per two frames can be shared and use a TE2.

D, M32-A, M32-B and M32-C select for use, and their purposes of part occasion is alternative, but software control is different.To decide according to incoming line (LAMS quantity) and output line (measuring head quantity) when selecting for use, if M32-A then must be used in LAMS quantity＞16,

The quantity of M32-A=measuring head quantity;

If 17＞LAMS quantity＞8, the most handy M32-B (also available M32-A, but waste is arranged),

M32-B quantity=measuring head quantity/2;

If 9＞LAMS quantity＞1, the most handy M32-C (with M32-A or M32-B also can, but waste is arranged),

M32-C quantity=measuring head quantity/4.

Indicator light implication on each plate

CTP

1, LED1 (tri coloured lantern): RS-485 communications status indicator light, free of data are green when transmitting; The 250ms that goes out when receiving the correct packet of verification recovers green then; Recover green when receiving the packet of check errors behind the glassy yellow 250ms.If during turning off the light, receive erroneous packets, horse back is switched to the amber light state and continues 250ms.Turn off the light or the amber light state under, receive correct bag, led status is unaffected.After receiving the order bag of testing oneself, lamp goes out (L16 needs 4～10 seconds approximately, and M32 needs 15～30 seconds approximately) when testing oneself, during do not receive any order.

2, LED2 (green light): power supply indication.

M32

1, LED1 (green light): communication indicator light (being the power supply indication simultaneously), free of data is green when transmitting; About 250ms that goes out after receiving packet and sending response data packet recovers green then;

2, LED2 (green light): 1X32 pattern indicator light, only bright when bouncing pilotage chooses 32 to select 1 pattern;

3, LED3 (green light): 2X16 pattern indicator light, only bright when bouncing pilotage chooses 16 to select 2 patterns;

4, LED4 (green light): 4X8 pattern indicator light, only bright when bouncing pilotage chooses 8 to select 4 patterns.

L16

1, LED1 (green light): power supply indicator, it is promptly bright to power on.

2, LED2 (green light): relay indicating light (the plate choosing is effectively), only when choosing this plate and the relay adhesive is arranged

Bright, otherwise go out.

TE2

1, LED1 (green light): communication indicator light (being the power supply indication simultaneously), free of data is green when transmitting; Receive

About 250ms that goes out to packet and after sending response data packet recovers green then;

2, LED2 (green light): 1 indicator light of working, only bright when choosing the 1st group of terminal emulation;

3, LED3 (green light): 2 indicator lights of working, only bright when choosing the 2nd group of terminal emulation.

LAMM is the backboard of each route selection frame, on 20 96 pin Europlugs are arranged, be used to assign CTP, L16, M32, TE2, wherein 64 pins can be inserted 3 * 8 plugs from behind, are used to patch the user side and the local side of subscribers feeder.All there is one 2 * 32 socket on the Europlug next door of each L16, is used for inserting SHC or STC.Also have other socket such as the input of 48V power supply, route selection output, M32/TE2 input, M32/TE2 output, RS-485 bus etc. on the motherboard.

All adopt passive component on the plate, comprise some sockets and protection device.Line on the plate closes to tie up in each plate operation principle and describes in detail.

Among Fig. 8, route selection communication and control board (Access Line Communication and control board) provide the power supply of whole route selection frame ,-48V input ,+the 5W Switching Power Supply of 5V output; There is the RS-485 mouth to communicate by letter, and the M32 on the whole frame, L16 and TE2 are controlled with host computer.The RS-485 bus is communicated by letter the CTP on each frame with the asynchronous serial port (changing into RS-485) of a PC, each CTP is assigned different address (going up the toggle switch setting by CTP), wherein address 0 and FFH ban use of, the CTP on 128 LAMS frames of the maximum may command of RS-485 bus.

CTP also can test automatically to the relay contact of L16 and M32, and contact resistance is found out and alarmed in the contact of (even obstructed) more than 6 Europe.Need connect corresponding test cable during test, and carry out the order that makes the measured relay adhesive.Method of testing sees 0

System tests oneself.

Power import and RS-485 port are taked anti-lightning strike design, are better than 500V (waveform 1.2/50 μ s, the 8/20 μ s) surge impact of YD/T1082-2000 standard code, can bear the 1500V surge impact.

Among Fig. 9,32 tunnel route selection matrix plates (32input Matrix board), M32-A (32 select 1), M32-B (2 group 16 is selected 1), three kinds of versions of M32-C (4 group 8 is selected 1) are arranged, and input is the line that each LAMS chooses, and outputs to measuring head (also might just arrive measuring head through TE2).

M32-A (32 select 1 version) connects measuring head from 32 lines optional 1 tunnel that insert, and state can latch; M32-B (16 select 1 version) can connect two measuring heads from the optional two-way of 16 lines, and two-way is independent optional, can choose simultaneously and latch mode; M32-C (8 select 1 version) can connect four measuring heads from 8 lines optional 4 tunnel, and four the road is independent optional, can choose simultaneously and latch mode.

M32 is controlled by the serial ports of CTP, and board type number is 0.Serial ports adopts the form of similar SPI, clock signal of output when CTP need transmit, and frequency is about 200kHz, every order needs 18 clock cycle, about 0.1ms, the 2nd to 9 cycle was transmitted order data by CTP to M32/TE2 simultaneously, and the 11st to 18 cycle was transmitted response data by M32/TE2 to CTP.The 10th cycle discharged for both sides and took over data/address bus transition usefulness in order to wake M32/TE2 usefulness up the 1st cycle, and clock line keeps low level when not transmitting, and data wire all keeps high-impedance state.

All data send all at rising edge clock, and the recipient is in clock trailing edge sampled data.

Among Figure 10,16 line selection line plates (16 Line board) can be subjected to CTP to control whether route selection, and which is chosen, and all L16 can only have a plate to choose one the tunnel at most on each frame.L16 does not latch the control line selection signal.

L16 is controlled by the parallel port of CTP, no latch function.Draw build-out resistor on having on the motherboard, if guarantee the signal reliable transmission and guaranteed that CTP does not have order or off-line, L16 is failure to actuate, and all relays are in default conditions, and all are in normal operating conditions by survey line.

L16 will obtain oneself slot number (address) from the motherboard slot of being inserted, and the address of all L16 has nothing in common with each other in frame, B[0 in the order that every L16 only sends CTP] ~ B[4] just respond identical with the address of oneself.

L16 connects first row (A row) access of local side subscribers feeder by Europlug, and the user side subscribers feeder inserts by the 3rd row (C row) of Europlug, and the secondary series of Europlug (B row) inserts other signal on the motherboard.

Among Figure 11, relay line selection mode schematic diagram as shown in the figure, every road subscribers feeder need use two relays (equipment in the past adopt three relays) more, can realize four kinds of functions, wherein acquiescence is the normal connected state of subscribers feeder, also is in default conditions even circuit board has a power failure.Have the circuit in 16 picture groups on L16, the condition of relay adhesive at first be the plate choosing effectively, choose then a road make corresponding action according to the control of control bit bit1 and bit0.Can insert 19 L16 in the LAMS at most, the slot that they take number was 2 to 20 (wherein slot 2 preferentially is used for inserting M32 or TE2), and selected plate number can be 2 to 20 in the CTP order, all discharges as need, option board 0 (because of plate 0 does not exist, so all L16 release relays).Under the situation on selected this road, dpdt relay S1, S2 are subjected to two position C[1 of GLC separately], C[0] control, as following table:

C[1] C[0] normal be communicated with (acquiescence) 00 normally be communicated with and monitor 01 only test local side 10 only the test subscriber hold 11

Short circuit connector SHC (Shortcut Connector), the connector that uses during warm swap L16, being used for 16 route roads of this L16 correspondence are communicated with is normal operating condition, influences the user in order to avoid plug L16 and uses.

Promptly before needs pull out away a certain L16, the path of normal connection being provided for 16 groups of subscribers feeders of this plate correspondence is to replace L16 function by default.Each piece L16 is plugging L16 behind to there being a position can insert SHC, before control L16 carries out route selection, pull out away the SHC of correspondence.

Among Figure 12, two groups of terminal emulation plate TE ₂(2 group Terminal Emulate board), be placed on before the measuring head, cooperate measuring head to use, can be to be carried out settings such as two line short circuits, A line ground connection, B line ground connection, A and the equal ground connection of B line, test bus antipole, loop resistance, ring appearance, ring sense, loop resistance appearance by survey line.Every TE2 can connect the two-way subscribers feeder.

TE2 can not use yet, and measuring head can directly be tested the line of choosing.

TE2 is controlled by the serial ports of CTP.Board type number is 3.

Software protocol

L16 parallel port control protocol

L16 is controlled by CTP, totally 11 holding wires, and the last nothing of L16 latchs, and each holding wire is defined as follows.

B[4] ~ B[0]: plate selects signal, is 2 to 19 to choose corresponding a certain L16 (depending on the slot position that L16 inserts); For other number, then do not choose any L16.

L[3] ~ L[0]: splitting signal, the L16 that chooses, L3 ~ L0 decoding is chosen one the tunnel.

C[1], C[0]: to the control signal of a road corresponding two relays of choosing, " 1 " expression adhesive, " 0 " expression discharges.

As need all relays are disconnected, B[4 is write in suggestion] ~ B[0]=0.

M32/TE2 serial ports control protocol

Each order and response, CTP sent out the 8bit data and gives M32/TE2 as order before this, and M32/TE2 sends out 8bit to M32/TE2 in response then.Because there is not processor on the M32/TE2, can not handle too complicated order, do not establish the order of CTP to the M32/TE2 query State, all states are stored by CTP.

Communicate by letter under the errorless situation, it is identical that both sides send out the 8bit content, the no parity check position, and everybody is defined as follows table, sends out a high position during communication earlier, sends out low level again.

Table 2 M32/TE2 serial port protocol control word

Bit7	?Bit6	?Bit5	????Bit4		??Bit3	??Bit2	??Bit1	?Bit0
									Board type " 00 ": M32 (having only board type is that the order of " 00 " is effective to M32)		1: a certain road is organized in adhesive	M32-A	The decode results of bit4 ~ 0 is chosen a road among 32 tunnel
M32-B	Choose a group in two groups	The decode results of Bit3 ~ 0 represent to this organize among 16 the tunnel to be chosen a road
						M32-C	Decode results represents to choose a group in four groups					The decode results of Bit2 ~ 0 represent to this organize among 8 the tunnel to be chosen a road
0: discharge	M32-A	Can be any number
							M32-B	Choose one group			Can be any number

	This organizes all roads;	M32-C	Choose one group		Can be any number
						" 11 ": TE2 (having only board type is that the order of " 11 " is effective to TE2)	(useless)	" 0 ": the 1st group " 1 ": the 2nd group		" 0000 ": cancel following operation; " 0001 ": the short circuit of A-B line; " 0010 ": A line shorted to earth; " 0011 ": B line shorted to earth and antipole; " 0100 ": A, the equal shorted to earth of B line; " 0101 ": antipole; " 0110 ": loop resistance; " 0111 ": ring holds; " 1000 ": ring sense; " 1001 ": loop resistance holds; Other: standby
Other: standby	Useless

The RS-485 bus protocol

Physical layer

The half-duplex asynchronous serial port is adopted in communication, and baud rate is 9600,8 bit data positions, 1 start bit, 1 position of rest, no parity check position, pass earlier low level, again pass high-order.

Principal and subordinate's multi-computer communication agreement of a main frame (PC), many slaves (CTP) is adopted in communication, be in charge of and dispatch the right to use of bus by main frame, slave transfers send mode to behind the execution corresponding operating immediately after receiving a Host Command, loopback is to the response condition of order.And can initiatively not send order to main frame.

It is 18ms that main frame finishes to the minimum interval that another communications packets begins from a bus communications packets.Ask a question and the overtime not response of slave as main frame, then no longer wait for.Main frame can not receive CTP response or receives the response message mistake in 35ms, then think this communication failure.

Frame structure

Sequence number	????1	????2	????3	????4	????5	????6
							Byte number	????1	????1	????2	LENID/2	????2	????1
Form	SOI	ADR	?LENGTH	????INFO	CHKSUM	EOI

Table 3

Sequence number	Symbol	The expression meaning	Remarks
				????1	????SOI	Start bit sign (START OF INFORMATION)	(7EH)
????2	????ADR	(1-254,0,255 keep) described in the device address
				????3	????LENGTH	INFO byte length (comprising LENID and LCHKSUM), data format sees 7.3
????4	????INFO	Command information: control data information COMMAND INFO (order) response message: reply data information D ATA INFO (parameter 1,2,3 ...)
				????5	????CHKSUM	Verification and sign indicating number, data format sees Table 4
????6	????EOI	End code	CR??(ODH)

Protocol layer

1) master data form

Every SOI of removing and EOI in 7.2 basic formats explain (SOI=7EH with hexadecimal, EOI=ODH), outside the hexadecimal transmission, all the other are every all to be to explain with hexadecimal, mode with hexadecimal-ASCII character is transmitted, each byte represents that with two ASCII character promptly high four ASCII character represent that low ASCII character of four usefulness is represented.Example: 4BH sends 34H (ASCII character of character " 4 ") and two bytes of 42H (ASCII character of character " B ") in proper order during transmission.

2) LENGTH data format

The data format of LENGTH is as shown in table 4.

Table 4

High byte

Low byte

Check code LCHKSUM				Length indication sign indicating number LENID (ASCII character byte number in the transmission of expression INFO)
																15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0

LENGTH is totally 2 bytes, is made up of LENID and LCHKSUM, and LENID represents the ASCII character byte number of INFO item, and when LENID=0, INFO is empty, does not promptly have this.Pass high byte in the LENGTH transmission earlier, pass low byte again, divide four ASCII character to transmit.

The calculating of check code: D11D10D9D8+D7D6D5D4+D3D2D1D0, the mould 16 remainder negates of summation back add 1.

Example:

The ASCII character byte number of INFO item is 18, i.e. LENID=0000 0001 0010B.

D11D10D9D8+D7D6D5D4+D3D2D1D0=0000B+0001B+0010B=0011B, mould 16 remainders are 0011B, and it is exactly 1101B that the 0011B negate adds 1, and promptly LCHKSUM is 1101B.

Can get:

LENGTH is 1,101 0,000 0001 0010B, i.e. D012H.

3) CHKSUM data format

The calculating of CHKSUM is except that SOI, EOI and CHKSUM, and other characters are by the summation that adds up of ASCII character value, and gained mould 65536 remainder negates as a result add 1, transmits with four ASCII character at every turn, passes high-orderly earlier, passes low level again.

Example:

The character string of receiving or sending is: " ~ 1203400456ABCDFEFC72CR " (" ~ " is SOI, and " CR " is EOI), and the FC72 in then last five characters " FC72CR " is CHKSUM, computational methods are:

‘1’+‘2’+‘0’+…+‘A’+‘B’+…+‘F’+‘E’

＝31H+32H+30H+…+41H+42H+…+46H+45H

＝038EH

Wherein ' 1 ' represents 1 ASCII character value, the ASCII character value of ' E ' expression E.038EH mould 65536 remainders are 038EH, and it is exactly FC72H that the 038EH negate adds 1.

Command list (CLIST)

Table 5 RS-485 bus line command and data (INFO) abridged table

Order	Response	Parameter [1]	Parameter [2]	Parameter [3],	Implication
						????01H		Bit4 ~ 0: plate number (1 ~ 19 is route selection) Bit6 ~ 5: control bit	Circuit number (bit3 ~ 0)	????-	The L16 route selection
	????81H	(with parameter among the 01H 1)	Circuit number (bit3 ~ 0)	????-	The response of L16 route selection
						????03H		Bit5 ~ 0 is with bit5 ~ 0 of table 2; Bit7 represent M32 communications status (0: correctly, 1: make mistakes) in the response 83H	?????-	????-	The M32 routing
	????83H	?????-	????-	The response of M32 routing
					????04H		?????-		????-	The M32 relay is tested oneself (must connect on request)
	????84H	?????-	????-	The response of 04H order
					????14H		???????-		?????-	????-	Inquire about the last M32 relay result that tests oneself
	????94H	Parameter [1/2/3/4]: parameter m n bit representation (m-1) * 8+n road result (0: correct, 1: make mistakes)						Return the last M32 relay result that tests oneself
					?????05H		Bit4 ~ 0 with table 2;		??????-	????-	TE2 control

Order	Response	Parameter [1]	Parameter [2]	Parameter [3],	Implication
							????85H	TE2 communications status (0: correct, 1: make mistakes) is represented with the bit4 ~ 0:bit7 of table 2 in Bit4 ~ 0	????-	????-	TE2 control response
????06H		??????-	????-	????-	Inquiry CTP state
							????86H	(with parameter among the 01H 1)	Circuit number bit3 ~ 0, version number: bit4 ~ 7	With byte shown in the table 2	The CTP status report
????08H		Plate number (1 ~ 19)	????-	????-	Certain piece L16 relay is tested oneself (must connect on request)
							????88H	Plate number (1 ~ 19)	????-	????-	The response of testing oneself of certain piece L16 relay
????18H		????-	????-	????-	Inquire about the last monoblock L16 relay result that tests oneself
							????98H	Plate number (1 ~ 19)	Parameter [2/3]: parameter m n position: expression (m-2) * 8+n road result (0: correct, 1: make mistakes)		Return the last monoblock L16 relay result that tests oneself
????09H		????-	????-	????-	CTP resets
							????89H	????-	????-	????-	CTP powers on or software reset, initialization finish

System tests oneself

After the order of testing oneself was received by system, whether each relay of test L16/M32 was controlled can (not connect subscribers feeder in other words) under the state of off-line, and whether each contact contact resistance exceeds normal operating range.Need 4 seconds approximately to 30 seconds, serial ports can not receive order therebetween, and status indicator lamp extinguishes.

After testing oneself, CTP will store test result, and the test result response be sent on the RS-485 bus when host computer is inquired about again.

L16 tests oneself

, link to each other with Registered Jack-45 on being positioned at LAMM two lines of whole local sides of L16 input, all two lines of user side, and two test bus of output that L16 chooses with the connecting plate of testing oneself (STC) by STC and cable thereof.

Have four to compare the electric bridge that resistance is used on the CTP, be used for testing between local side bus and test bus and user side bus and test bus between relay contact and connector whether surpassing 6 Europe by the contact resistance under the feed of 25mA electric current.

According to the form below executable operations successively can be tested two relays of one tunnel then; Need not to change wiring, change the software control order, repeat following test and can test upward all relays of a L16.Can be on two relays on a certain road fault location, but can not judge that in two relays which break down.

The every road of table 6 relay contact contact resistance testing procedure

Step	????C[1]	????C[0]	The contact is each electric bridge result just often
					Electric bridge 1,2	Electric bridge 3,4
			????1	????0			????0	????H	????H
????2	????1	????1			????L	????L
			????3	????1			????0	????L	????L

M32 tests oneself

With the connecting plate of testing oneself (STC) whole A, the B line of M32 input, and two A, the B line of output that M32 chooses, link to each other with Registered Jack-45 on being positioned at LAMM by STC and cable thereof, also to link to each other the output bus that L16 chose on the frame with the M32 output line in addition, to form the loop with one two line cable.

CTP has four electric bridges, is used for testing between M32 input, output relay contact and connector and whether is surpassing 6 Europe by the contact resistance under the feed of 25mA electric current.

To each road by adhesive, disconnect executable operations successively, can test two relays on this road; Need not to change wiring, single-chip microcomputer changes the software control order automatically, repeats following test and can test upward all relays of a M32.Can be fault location on a certain road.

Test result during each road relay adhesive should be read to such an extent that electric bridge output is low level; Should read to such an extent that electric bridge output is high level when relay disconnects.If any not being inconsistent, can judge that this road relay is malfunctioning.

Claims (5)

1, a kind of subscriber line test platform route selection matrix, it is characterized in that: constitute by 1～32 route selection frame LAMS, be equipped with a route selection frame motherboard LAMM on each route selection frame LAMS, assigned a Control on Communication, test oneself and power panel CTP, 18-19 piece 16 line selection line plate L16,32 tunnel route selection matrix plate M32, Control on Communication, test oneself and power panel CTP provides the power supply of whole route selection frame LAMS, there is the RS-485 mouth to communicate by letter with host computer, and to 32 tunnel route selection matrix plate M32 on the whole frame, 16 line selection line plate L16 control and test oneself, 32 tunnel route selection matrix plate M32 input is the line that each route selection frame LAMS is chosen, output to measuring head, 16 line selection line plate L16 can be subjected to CTP control route selection, all L16 can only choose one the tunnel simultaneously on each frame, on the socket at the 16 line selection line plate L16 back sides, be inserted with short circuit connector SHC and the passive connecting plate STC that tests oneself, short circuit connector SHC uses when warm swap 16 line selection line plate L16, being used for 16 corresponding with it route roads is communicated with and is normal operating condition, the passive connecting plate STC that tests oneself can be all local side A lines of 16 tunnel of 16 line selection line plate L16, the B line, user side A line, the B line separately and to connect be four buses, and outgoing cable is inserted into Control on Communication, test oneself and power panel CTP, 16 line selection line plate L16 and 32 tunnel route selection matrix plate M32 are tested.

2, matrix according to claim 1 is characterized in that: before measuring head, can be provided with two groups of terminal emulation plate TE2, and by Control on Communication, test oneself and power panel CTP control, cooperate measuring head to use.

3, matrix according to claim 1 and 2, it is characterized in that: Control on Communication, test oneself and power panel CTP comprises single-chip microprocessor MCU, the RS-485 interface, the parallel bus drive circuit, electrify restoration circuit, L16/M32 relay contact contact resistance test circuit, bouncing pilotage is imported 485 port addresss, drive circuit, power supply/communication indicator light circuit,-48V changes the 5V switching power circuit, user side and local side link tester are crossed L16/M32 relay contact contact resistance test circuit test result are delivered to single-chip microprocessor MCU, single-chip microcomputer is sent to 32 tunnel route selection matrix plate M32 and terminal emulation plate TE2 to clock data, and control signal is delivered to 16 line selection line plate L16 by the parallel bus drive circuit, bouncing pilotage imports 485 port addresss and electrify restoration circuit all links to each other with single-chip microprocessor MCU, and the signal of single-chip microprocessor MCU output is also delivered to power supply/communication indicator light circuit by drive circuit.

4, matrix according to claim 1, it is characterized in that: 32 tunnel route selection matrix plates comprise CPLD circuit, RC monostable trigger-action circuit, communication, three kinds of pattern indicator light circuits, drive circuit, 32 relays, the CPLD circuit links to each other with single-chip microprocessor MCU by the Serial Control line, and link to each other with the RC monostable trigger-action circuit, the signal one tunnel of CPLD circuit output is delivered to communication, three kinds of pattern indicator light circuits, and 32 relays are delivered to by drive circuit in another road.

5, matrix according to claim 1, it is characterized in that: 16 line selection line plate L16 comprise by plate address comparison circuit, 4-16 decoder, 32 CPLD circuit that 2 input AND circuit are formed, and drive circuit, 32 are grabbed line relay, are grabbed the line indicator light circuit, the output one tunnel of plate address comparison circuit is delivered to and is grabbed the line indicator light, the 4-16 decoder is delivered on another road, 32 2 input AND circuit are delivered in the output of 4-16 decoder, and the signal of 32 input AND circuit output is delivered to 32 by drive circuit and grabbed line relay.

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