CN2364632Y

CN2364632Y - Automatic protection circuit arrangement in digital relay transmission line

Info

Publication number: CN2364632Y
Application number: CN 99235243
Authority: CN
Inventors: 辜明军; 邱锦; 温扬
Original assignee: Shenzhen Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 1999-01-23
Filing date: 1999-01-23
Publication date: 2000-02-16
Anticipated expiration: 2009-01-23

Abstract

The utility model relates to an automatic protection circuit arrangement in a digital relay transmission line, which comprises a supervision processing circuit 1, cable connectors X1, X2, X3 and X4, and coupling transformers T1 and T2. The utility model only uses two relays K1 and K2, break contacts 9 and 2 of two contact sets of each of the relays K1 and K2 are respectively interconnected; two pairs of moving contacts 8 and 3 are respectively connected with a core wire an E1 wire (or a signal wire); two sets of moving combination contacts 7 and 4 are respectively connected with one end of a secondary winding of the transformers. Compared with the prior art, the utility model realizes the same functions with less than half the relays, the cost for production and maintenance is lowered, and the echo return loss of the circuit is reduced. The utility model is connected with an overvoltage protection device, the circuit reliability is increased, and the security of the system is enhanced.

Description

Automatic protection circuit device on the digital junction transmission line

The utility model relates to time slot and the sub-slots multiplex technique on the technical field of telecommunications digital junction transmission line, particularly relates on 2M (megabit) E1 (digital junction) transmission line utilizing time slot and sub-slots multiplex technique to carry out the circuit automatic protection circuit of remote monitoring.

Prior art is utilized time slot and sub-slots multiplex technique that image and data-signal are inserted on the 2M E1 circuit to transmit, thereby realize centralized monitor to communications office site or Room Power equipment and environment, its benefit is: first, this technology only takies the several of 2M transmission line even a time slot, all the other time slots still are used for original communication, have greatly saved transfer resource; The second, the 2M circuit is one of the most frequently used transfer resource of communications office site, and this technology has wide practical value in the communication system monitoring.But, along with applying of this technology, but expose a very big problem, be exactly, pilot signal and speech channel be because coexist on the E1 line, when watch-dog breaks down or during system cut-off, telephone path signal will be had a strong impact on even interrupt communication, this especially is difficult to accept in mobile telephone base station at the office station of transfer resource anxiety.For addressing this problem, prior art has adopted relatively more burdensome way, is exactly all respectively to connect a dpdt relay on four E1 lines of each 2M circuit, as shown in Figure 1.Under normal circumstances, the line RUN-LAT of monitoring treatment circuit 1 control relay state is a low level, relay K 1 to K4 excitation, their transfer contact group k1-1 and k1-2, make each Bayonet Nut Connector X1 to X4 of E1 line be connected the multiplexing and demultiplexing of time slot (sub-slots) of realization pilot signal with monitoring treatment circuit 1 with coupling transformer T1, T2 to k4-1 and k4-2 from mouth by main mouthful.In case watch-dog breaks down or system cut-off, described RUN-LAT line is converted to high level, and each relay K 1 to K4 discharges, and main mouthful two cable-to-cable connector X1, X2 will be with straight-through from the corresponding connector X4 of mouth, X3, to ensure proper communication.Practice result finds that there is following defective in this solution of prior art: 1. use relay too many, cost is higher, has reduced system reliability, has increased maintenance workload; 2. the scheme of four relays causes that armature contact is many, PCB (printed circuit board (PCB)) wiring complexity and circuit be longer, influence the impedance matching of 2M circuit, causes return loss to increase, the transmission reliability reduction; 3. do not take the line thunder protection measure.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and automatic protection circuit device on a kind of more perfect digital junction transmission line is provided; can only just realize: when system cut-off or monitoring treatment circuit fault with two relays; make the direct connection of 2M circuit and needn't pass through monitoring treatment facility internal circuit; after system restoration power supply and described monitoring treatment circuit operate as normal; the first via of 2M E1 all switches to again with the device interior circuit with the second tunnel transmitting-receiving circuit and links to each other, and described monitoring treatment facility is connected in series to described 2M transmission line once more and gets on.

The purpose of this utility model can realize by adopting following technical scheme: manufacture and design the automatic protection circuit device on a kind of digital junction transmission line; comprise the monitoring treatment circuit; the connector of main mouthful coaxial cable; connector from the mouth coaxial cord; also have main mouthful signal coupling transformer and behind the signal coupling of mouth transformer, and relay.Have only two relays in this device, their excitation winding is in parallel mutually, by the monitoring processing circuit controls; The two relays break contact of two contact sets separately are connected to each other respectively, totally four moving contacts respectively connect an E1 coaxial cable core wire, then each connects main mouthful and from secondary winding one end of mouth coupling transformer to the make contact of two contact sets, and each secondary winding of two coupling transformers does not connect the whole ground connection of an end of relay contact; Lead mouth and be equipped with the also whole ground connection of coaxial cable shell line from mouth.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the automatic protection circuit principle of device circuit diagram that prior art is used four relays;

Fig. 2 only uses the automatic protection circuit principle of device circuit diagram of two relays for the utility model.

Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing:

The utility model is used for the automatic protection circuit device on the digital junction transmission line; as shown in Figure 2; comprise monitoring treatment circuit 1; connector X1, the X2 of main mouthful coaxial cable; connector X3, X4 from the mouth coaxial cable; also have main mouthful signal coupling transformer T1 and from the signal coupling transformer T2 of mouth, and relay.Each unit, the interconnective relation of device are in the described automatic protection circuit device

A. have only two relay K 1 and K2 in the described device, their excitation winding is in parallel mutually, by the RUN-LAT line traffic control of monitoring treatment circuit 1;

B. the

break contact

2 and 9 of relay K 1 liang of contact sets k1-1, k1-2 is connected to each other, and the moving contact 3 of k1-1 connects the heart yearn w4c of junction cable W4, and the moving contact 8 of k1-2 connects the heart yearn w1c of junction cable W1;

C. the

break contact

2 and 9 of relay K 2 liang of contact sets k2-1, k2-2 is connected to each other, and the moving contact 3 of k2-1 connects the heart yearn w2c of junction cable W2, and the moving contact 8 of k2-2 connects the heart yearn w3c of junction cable W3;

D. the make contact 7 and 4 of the contact sets k2-1 of the contact sets k1-2 of relay K 1 and K2 is connected to respectively and leads mouthful 16 ends and 11 ends of twice level windings of coupling transformer T1;

E. the make contact 4 and 7 of the contact sets k2-2 of the contact sets k1-1 of relay K 1 and K2 is connected to respectively from 11 ends and 16 ends of twice level windings of mouth coupling transformer T2;

F. two each secondary winding of coupling transformer T1 and T2 are connected an end of relay contact, and two

group

14 and 9 ends are ground connection simultaneously;

G. described main mouthful and from the whole ground connection of shell line w1s to w4s of each coaxial cable W1 to W4 of mouth.

Circuit arrangement of the present utility model utilizes the inherent characteristic of relay, by its break contact bypass, the 2M circuit can directly be communicated with and without monitoring treatment facility internal circuit during power down.After all are normal, make the relay adhesive again, main mouthful all switches to again and monitors the treatment facility internal circuit and link to each other with transmitting-receiving circuit from mouth, the monitoring treatment facility is concatenated on the 2M transmission line, having changed each bar circuit of prior art all needs a relay, uses the method for four relays altogether.Prior art is when the relay changing-over, be to make each coaxial cable core wire, shell line and each coupling transformer secondary winding two ends changing-over simultaneously, and the utility model circuit arrangement changing-over cable core and termination of each secondary winding of transformer, another termination of shell line and winding is ground connection completely, thereby reduce half relay consumption, guaranteed the realization of systemic-function equally.

Be to increase the fail safe of circuit operational reliability and system, each coaxial cable W1 to W4, its each to heart yearn and shell line each other, comprise w1c and w1s, w4c and the w4s overvoltage protection device that all respectively is connected in parallel, FV1 to FV4.The multiple device that normally non-linear piezo-resistance of this device FV1 to FV4 and discharging gap constitute.Can certainly use other devices of voltage stabilizing didoe, gas discharge tube and so on.The used relay K 1 of the utility model, K2 are the electromagnetic relays of dpdt double-pole double-throw (DPDT).

Below be the used unit of the utility model circuit arrangement most preferred embodiment, device inventory:

Unit, device name circuit symbol model, specification manufacturer

Relay K 1, K2 DPDT NEC

Junction cable connector X1 to X4 SMB BERG

Overvoltage protection device FV1 to FV4 TPN 3021 SGS-THOMSON

Coupling transformer T1, T2 T 1023 PULSE

Compare with prior art, the utility model circuit arrangement is but realized said function with half relay less, Reduce production and maintenance cost, reduced the return loss of circuit, and owing to use the overvoltage protection device, Greatly increase circuit reliability, improved Security of the system.

Claims

1. the automatic protection circuit device on the digital junction transmission line comprises monitoring treatment circuit (1), and connector X1, the X2 of main mouthful coaxial cable are from connector X3, the X4 of mouth coaxial cable.Also have main mouthful signal coupling transformer T1 and from the signal coupling transformer T2 of mouth, and relay, it is characterized in that:

A. have only two relay K 1 and K2 in the described device.Their excitation winding is in parallel mutually, by monitoring treatment circuit (1) control;

B. the break contact 2 and 9 of relay K 1 liang of contact sets k1-1, k1-2 is connected to each other, and the moving contact 3 of k1-1 connects the heart yearn w4c of junction cable W4, and the moving contact 8 of k1-2 connects the heart yearn w1c of junction cable W1;

C. the break contact 2 and 9 of relay K 2 liang of contact sets k2-1, k2-2 is connected to each other, and the moving contact 3 of k2-1 connects the heart yearn w2c of junction cable W2, and the moving contact 8 of k2-2 connects the heart yearn w3c of junction cable W3;

F. two each secondary winding of coupling transformer T1 and T2 are not connected an end of relay contact, and two group 14 and 9 ends are ground connection simultaneously;

2. according to the automatic protection circuit device on the described digital junction transmission line of claim 1; it is characterized in that: described each coaxial cable W1 to W4; its each to heart yearn and shell line each other; comprise w1c and w1s; to w4c and the w4s overvoltage protection device that all respectively is connected in parallel, FV1 to FV4.

3. according to the automatic protection circuit device on the described digital junction transmission line of claim 1, it is characterized in that: described relay K 1 and K2 are the electromagnetic relays of dpdt double-pole double-throw (DPDT).

4. according to the automatic protection circuit device on the described digital junction transmission line of claim 2, it is characterized in that: described overvoltage protection device FV1 to FV4 is the multiple device that non-linear piezo-resistance and discharging gap constitute.