KR960013265B1 - Remote access subscriber module - Google Patents

Abstract

The apparatus presented features to carry out all the process at the master exchange office in case of normal condition, use temporary storage in case of abnormal link condition and send the information back to the memory of the master exchange office for processing. The apparatus comprises a transmission and reception data circuit, PCM transmision and reception circuit, transmission and reception interface circuit, clock generating circuit, warning data store and retrieve circuit, maintenance information control circuit, interprocess communication network interface circuit, control processor interface circuit, and slip control circuit.

Description

North American (T1) type P.M. (PCM) link matching device between station exchange and remote switch

1 is a connection block diagram of a device in which the present invention is mounted.

2 is a detailed connection diagram between an external block and a device in which the present invention is mounted.

3 is a block diagram of a T1 link matching device of a home exchange.

4 is a block diagram of a T1 PCM link matching circuit (ETLA) according to the present invention.

5 is a diagram of inter-processor communication channel allocation of a T1 link in a remote switching device and a home exchange.

6 shows the subhighway timeslot double between the time switch and the present invention.

* Explanation of symbols for main parts of the drawings

41: transmission and reception data configuration circuit 42: PCM transmission and reception circuit

43: transmission and reception line matching circuit 44: clock reproduction circuit

45: alarm data insertion / extraction circuit 46: maintenance information control circuit

47: communication network matching circuit between processors 48: control processor matching circuit

The present invention provides a North American (T1) system in which a link connection between a remote switching device having a subscriber matching function and a home office switch is installed in a public telecommunication network for a communication service of a small subscriber located at a remote location. The present invention relates to a North American (T1) type PCM link matching device for connecting and operating using a PCM transmission line and a transmission device.

Remote Switching System in Digital Switching System installs small switchboard with subscriber matching function in remote area for communication service of small subscriber, minimizing the cost of the line with the largest proportion in network design, but using same service as subscriber accommodated in home country Refers to a device for providing.

In order to provide such a service, a conventional remote switching device usually performs an exchange at a switch of a home country, performs all processing at the home country for billing calls to other home subscribers, home subscribers, or other countries, and charges are also performed at the home country. If the link between the home country and the home country is disabled, there is a problem with the path between the home country and the home country, so that normal service cannot be provided. Therefore, it is impossible to make calls between mother country and other countries. It only performs the billing process.

Therefore, in the present invention, the internal memory and the external relay line are partially accommodated in the remote switching apparatus to perform all the processing in the mother station in the normal state, and temporarily charge the billing and other information in the internal memory when there is an error in the link between the mother station and the own station. It is an object of the present invention to provide a North American (T1) type PCM link matching device that stores data and sends the data to a storage device of a home country to enable processing.

The present invention for achieving the above object relates to a T1 link matching device for connecting a Remote Access Subscriber Module (RASM), which is a remote subscriber matching device of an electronic switchgear and a home office switch through a T1 1544 Kbps transmission line used in the existing network. A T1 link line that provides the ability to transfer communication data and service data between processors using a T1 transmission path of 960 channels, or 40T1s, by connecting the matching board to the control processor and external blocks using a T1 link matching board assembly; It is a device for testing circuits, and it matches with transmission equipment that satisfies the format and transmission characteristics recommended in CCITT G. 703 and G. 733 so that it can be connected and operated with the main office switch. Subscribers will be diverted to neighboring countries for call processing. Even if these were to receive at normal seoeobiseu.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a connection block diagram of a device in which the present invention is mounted in a remote switching apparatus, and FIG. 2 is a detailed connection diagram between the device and the external block in which the present invention is mounted, and a configuration of a link matching device. 4 is a block diagram of an T1 link matching circuit (ETLA PBA) constituting the present invention, and FIG. 5 is a diagram illustrating a process between a remote switching device and a processor in a T1 link allocated during a home exchange. Indicates channel assignment for communication. 6 also shows the subhighway timeslot doublet between the time switch in the remote switching device and the device of the present invention.

1 is a matching part 1 with a T1 transmission path for connection with a mother station, a matching part with a control processor 2, a matching part with a time switch in a remote switching device, and matching with an interprocessor communication net. (4), the network synchronizer matching section (5) for generating a reference frequency for clock synchronization between the remote switching system and the home exchange, and the alarm block and matching section (6). .

T1 link matching part of (1) is matched with transmission line in pulse form satisfying electrical characteristics recommended in CCITT G. 703 and B8ZS code recommended in CCITT 1.431 as transmission code for ISDN or packet call processing. To transmit.

The control processor matching part of (2) is matched with RLIP, which is the control processor of this device, to send the necessary information for line status control such as alarm occurrence and slip, bipolar code violation, etc. for the link, remote loop test and self-loop when requested. It receives the test request, performs the test, and reports the result to the processor through the control processor.

The matching part with the time switch of (3) receives the 8KHz sync signal and 4096KHz clock required by this device from the time switch, and transmits and receives service data through the subhighway of the 2048bps serial interface. At this time, the channel allocated as the communication path between processors is prohibited from being used, and receives an idle code to be transmitted to the idle channel from the time switch device.

The interprocessor communication net matching part of (4) has an IPC matching part in the T1 link matching device to provide the necessary channel for interprocessor communication between the remote switching device and the home exchange, so that the processor data of the remote switching device is transferred to the processor net of the home country. To be connected and processed.

The network synchronizer part of (5) drives the network synchronizer by using the clock extracted from the link connected to the mother station as a reference frequency to make and supply the clock required by the remote switch so that the clock synchronization with the mother station is achieved.

The alarm collecting device connection part of (6) collects the fault alarms generated by this device in units of back planes and sends them to the alarm device.

FIG. 2 is a detailed connection diagram of FIG. 1, in which each matching function is composed of ETLA units, which are PBAs capable of processing 5T1 units.

The PBA of ETLA Chapter 1 can handle 5T1 data, the first T1 of the PBA uses 16 channels as the 1024 Kbps IPC link from the first to the 16th channel, and the remaining eight channels are allocated for voice and data services. It is configured to be used.

(21) regenerates the reference clock from T1 connected to the mother station and sends it to the redundant network device in the remote switch.The clock is set as the reference frequency. To use.

(22) shows the detailed connection diagram with the time switch device, and one subhighway per PBA is allocated to the time switch with a subhighway of 2048 Kbps. The T1 frame has four subhighways corresponding to 5T1 according to the subhighway timeslot doubleness of FIG. 6 to enable voice and data services with the mother station. At this time, the channel corresponding to the 16 channels of the first T1 is not used for the use of the allocated IPC channel for interprocessor communication, and the timeslots 0 and 16 of every subhighway are not used. Subhighway matching is connected by RS 422 matching, taking the distance from the time switch into account. The remaining four T1s, except for the first T1, are allocated for voice and data services, and are flat and operated as shown in FIG.

(23) is the interworking between the T1 link matching device and the inter-processor communication net in the remote switch, and receives the inter-processor communication data received at 1024 Kbps through the 16 channels from the first channel of the first T1 in the ETLA. In this case, it transmits directly to the processor communication net according to the specified standard of the receiving alarm.

Reference numeral 24 denotes a connection to the control processor RLIP, which transmits and receives alarm data and maintenance information for up to 960 channels of T1 channels connected to one processor and one TD bus per two back planes. Data transmission to and from the processor is configured to transmit and receive messages through the common memory implemented in each PBA according to the specified signal standard through the TD-bus, and in combination with the firmware in the block, various test functions and self The diagnostic function is implemented and the distinguishing of each PBA in the block is made possible by the corresponding identification address of 4Bit as a group of 5T1 in the back plane. Termination of the TD-Bus connected by RS-485 matching is performed in the back plane.

Data transmission / reception with the control processor stores the bipolar vibration and sleep occurrence counts every 4ms at the corresponding address of common memory to evaluate the alarm occurrence and the cause, the line performance, and the RLIP reads the 8ms RTC cycle. Control of the unit.

(25) indicates the connection with the alarm device. The alarm collector is matched to the TTL level. The alarm collector is collected from the back panel in the form of promised information on power failure, PBA hernia, cable hernia and PBA dysfunction. You will be informed.

3 is a portion mounted in the mother station to match the remote switch, and the T1 link matching device of 31 matches using the same PBA as the remote switch. 32 is a highway speed converter that converts 32-channel 2048 Kbps serial data into 8092 Kbps parallel data to match the space switch and T1 link matching device of the main office switch and the 8 KHz required in the PBA for T1 link matching in the home country. It provides the function of supplying synchronization signal and 4096KHz clock, and is configured to process data of up to 4096 channels, and is composed of active / standby redundancy.

(33) is a space switch of the main office exchange to perform group switching of 8092 Kbps highway data coming through the highway speed converter under the control of the control processor.

(34) is a network device of a main office exchange, which performs a function of supplying a stable clock to the system through a phase locked loop circuit based on a frequency input from an upper station connected to the home station, and is configured and operated in triple.

(35) means HLIP, which is a control processor, and one TD-bus is connected to four T1 link-matching backplanes to transmit and receive alarm data and maintenance information for up to 1920 channels of T1 channels. It is connected to two TD-buses and performs the function of alarm collection. Data transmission and reception with the processor is configured to transmit and receive the message through the common memory implemented in each link matching PBA according to the specified signal standard through the TD-bus, and various tests in combination with the firmware in the block Functions and self-diagnosis functions are implemented, and each PBA in a block can be distinguished by a corresponding identification address of a bit in a group of 5T1 in the back plane.

Termination of the TD-bus connected by RS-485 matching is done on the backplane.

Data transmission / reception with the control processor stores the bipolar vibration and the number of sleep occurrences every 4ms at the corresponding address of common memory to evaluate the alarm occurrence and cause, the line performance, and the HLIP reads the 8ms RTC cycle. Control of the unit.

4 is a block diagram of ETLA which is a TBA link matching PBA constituting the present invention.

ETLA can handle five T1 links internally, the first T1 of which 16 channels are allocated for interprocessor communication, and the remaining eight channels can be used for voice and data services, and only for voice and data by straps. It is also configured to be used.

Transmitting / receiving data constructing circuit 41 is a circuit having a function of converting subhighway data inputted from a time switch as shown in FIG. 6, and RS-channel serial PCM subhighway data of 2048 Kbps 32 channels in the form of FIG. It transmits / receives in 422 matching method and enables channel-by-channel loop-off test and channel-by-channel loop test.

The PCM transmit / receive circuit 42 inserts and transmits the frame synchronization signal in accordance with the T1 frame type recommended by the CCITT, and transmits the data input from the transmit / receive data configuration circuit 41. do. In addition, there is a loop test circuit inside, so if the operation occurs in case of failure or initial initialization, it can be initialized first to check the status of the line, match station, and relay line matching device of the country, and to easily identify the cause of the failure and the location of the failure. At the request of the control processor and the case, the local loop test by T1 unit and the loop test using the AIS signal are performed to make it easy to determine the failure point.

At this time, the test data may send a predetermined data pattern by the firmware, the tester may send the arbitrary data for testing, and the number of error occurrences may be calculated by the firmware according to the test results. The result is stored in the common memory, and the control processor reads the result, determines the result, informs the operator of the alarm message, and performs blocking on the line.

The transmission / reception line matching circuit 43 performs a function of converting unipolar pulses into bipolar pulses having excellent transmission efficiency recommended by CCITT.

The clock reproducing circuit 44 regenerates the clock from the inputted received signal through the LC tank circuit to use the reference frequency for the network synchronizer. At this time, in order to guarantee the reliability of the clock, the frame synchronization signal and the frame error signal are sent together so that the frame error signal is not used when the clock is used as the reference frequency.

The alarm data insertion / extraction circuit 45 regards the remote alarm when a continuous bit 2 data is received as 0 from the signal received from the power station, and outputs an alarm message to the local station or the transmission line through the control processor. This should allow for proper action. Conversely, if the frame synchronization of the received signal is not correct or if there is no input signal, bit 2 of all data sent to the station is sent as 0 so that the station can recognize the alarm condition.

The maintenance information control circuit 46 stores the number of Bipolar violations and the results of the local loop test or the power loop test in the common memory after the received signal is received by the control processor. Take measures such as blocking.

The inter-processor communication net matching circuit 47 is a circuit for processor communication between the remote switching apparatus and the main office switching period, and receives 16 IPC channel data of the first T1 from the transmit / receive data configuration circuit 41 to communicate with the processor such as clock and alarm states. It performs the function of sending to the net.

The control processor matching circuit 48 enables an operation of reading or writing data stored in the common memory by RS-485 matching through the TD-bus so that the present invention can perform a call processing process under the control of the control processor. do.

The sleep control circuit 49 overlaps or loses data when synchronization between the clock extracted from the signal received by the PCM transmission / reception circuit 42 and the internal clock of the system transmitted from the control processor matching circuit 48 does not match. To do this, two frames of elastic memory can be set to prevent data loss.

5 shows the communication channel allocation between the remote switch and the T1 link of the T1 link during the home exchange. In the first to 16 channels of the T1 24 channels, IPC of 1,024 Mbps is used to transmit and receive data for inter-processor communication with the home exchange. By providing a path, the remaining eight channels can be allocated as channels for voice and data services, enabling efficient system usage with efficient channel usage.

FIG. 6 is a subhighway connection diagram connected between a time switch and a device of the present invention, and shows channel allocation between a 2048 Mbps 32 channel serial data input / output with a time switch and a T1 1544 Mbps PCM link connected to a mother station.

18 channels of 0 to 17 of the first subhighway input from the time switch are filled with meaningless invalid data so that the data of the corresponding channel is not switched at the time switch, and only the data of the remaining 14 channels are regarded as valid data. Switch it on.

Channels 0 and 16 of the second to fourth subhighways are also invalid data, and the valid data is limited to 30 channels. In this way, up to 128 channels of data can be switched by connecting the time switch and four subhighways, but only 120 channels are effective because they are transmitted in units of 24 channels due to the frame structure of the T1 transmission path.

For this reason, in the present invention, the channel assignment of the four subhighway 128 channels between the 5T1 120 channel and the time switch is configured as shown in FIG.

Here, the continuation notation used in the above description, RLIP is a remote link interface processor, HLIP is a host link interface processor, RTC is a real time clock (Real Time) Clock, ETLA stands for Extended 71 Link Interface Board Assembly.

Therefore, the present invention configured and operated as described above, the T1 transmission and transmission equipment that is using all the data including the inter-processor communication data to the existing network in the link connection with the remote switching device for the small subscriber in the public communication network It is possible to operate economically by using the network, etc., so that the network can be operated.

Claims (1)

It converts the subhighway data inputted from the time switch, transmits and receives the 2048 Kbps 32-channel serial PCM subhighway data with RS-422 matching method, and performs the loop test for each channel and the loop for each channel, including switching function per channel. A transmission / reception data configuration circuit 41 which enables a test and data input from the transmission / reception data configuration circuit 41 are inserted and transmitted by inserting a synchronization signal, and a frame synchronization signal is found from the input signal to identify a channel. PCM transmission and reception circuit 42 having a loop test circuit therein to grasp the state of the line, relay station, and relay line matching device of the station, and to perform a local loop test using a T1 unit and a loop test using an AIS signal. The amount of excellent transmission efficiency that is provided between the circuit 42 and the T1 transmission line to recommend unipolar pulses as recommended by CCITT. Retransmission of the clock from the transmission / reception line matching circuit 43 and the transmission / reception line matching circuit 43 and the FH input received signal to convert the frame synchronization signal and the frame error signal into reference signals It is connected to the clock reproducing circuit 44 and the PCM transmitting / receiving circuit 42 to be used as a frequency. Alarm data insertion / extraction circuit (45) and transmission / reception data configurator (41) for outputting an alarm message to the transmitter unit or the transmission line and transmitting an alarm bit when the frame synchronization of the received signal is not correct or there is no input signal. The number of Bipolar violations in the received signal inputted through) and the result of local loop test or large loop test. The maintenance information control circuit 46, which is stored in a memory and transmitted to the control processor side, and the processor that receives the communication channel data between the first processors from the transmission / reception data configuration circuit 41 and transmits the data to the processor communication network such as a clock and an alarm partner. A control processor matching circuit (48), which enables the operation of reading or writing data stored in the common memory through the TD bus through the communication net matching circuit (47) and the RS-485 matching method, and performing a matching function with the control processor (48). ) And a slip control that prevents duplication and loss of data when the synchronization between the clock extracted from the signal received by the PCM transmit / receive circuit 42 and the internal clock of the system transmitted from the control processor matching circuit 48 does not match. A North American (T1) type PCM link matching device between a mother exchange and a remote switch, comprising a circuit (49).