IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment

The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment is 64K time-slot non-blocking cross-connect equipment that uses the 64K time slot as the scheduling granularity. It is developed by Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. and is used to complete non-blocking cross-connections between 2.048 Mbit/s E1 channels and to multiplex multiple services such as voice and data into the same transmission channel. The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment integrates DXC digital cross-connect and PCM multiplexing in one unit, so one unit does the work that previously took two — a PCM multiplexing unit and a DXC cross-connect unit; cross-connection relationships are delivered one by one on a 64K time slot basis, any time slot can interconnect with any other, and adding or adjusting circuits does not affect existing services; PCM30/32 channel-associated signaling enables the equipment to directly interconnect with existing E1 equipment that adopts the ITU-T G.703 standard, so upgrade scenarios continue the original transmission system; the V.35 interface rate is configured as required as n×64 kbit/s (n = 0~31), so data services do not have to fill the whole E1. As a product showcase for multiple industries, Raytrans has incorporated its technical accumulation in PCM time-slot cross-connect equipment and optical multiplexing equipment, and it is widely applicable to scenarios such as government private network optical fiber communication solutions, military emergency communications vehicle solutions and smart mining communication solutions.

Key Specifications at a Glance: 64K non-blocking cross-connection · PCM30/32 · n×64K V.35 · DC/AC power supply · 2.048 Mbit/s E1 · ≤150 W

What Kind of Equipment Is the 64K Time Slot Non-Blocking Cross-Connect Equipment?

The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment is circuit-mode transmission equipment designed for industrial private networks and multi-service access nodes, in which the DXC part handles 64K time-slot-level cross-connections and the PCM part handles voice channel access and base group multiplexing, with both parts sharing the same cross-connect matrix. As typical PCM equipment, the unit connects to an E1 line on one side and provides an audio interface and V.35 and RS-232 data interfaces on the other side; after services enter the equipment they are uniformly split into 64K time slots and allocated as required through the cross-connect matrix to the designated time slot of the target E1 channel, so circuit scheduling is completed without changing the external transmission line and private network dispatch no longer depends on manual patch cords. This integrated service access device plays a key bridging role between time-slot cross-connect equipment and optical multiplexing equipment.

Figure 1: Overall appearance of the front of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment chassis

The typical use of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment is as a shared cross-connect node in a private network: the uplink uses E1 to interconnect with transmission equipment, and the downlink accesses services such as telephones, low-speed data and V.35 synchronous data, with the equipment completing time-slot-level transfer and multiplexing, so one E1 carries voice and data at the same time, replacing the past practice of laying dedicated circuits point-to-point.

What Can This Equipment Do? Core Functions at a Glance

The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment concentrates cross-connection and multiplexing capabilities on the same platform, and the function items and their roles are listed in the table below.

How Is 64K Time-Slot Non-Blocking Cross-Connection Implemented?

How 64K time-slot non-blocking cross-connection is implemented depends on the cross-connect granularity and the matrix resources: the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment uses the 64K time slot as the cross-connect granularity, and the cross-connect matrix establishes an independent connection relationship for each of the 32 time slots of every E1, so any input time slot can be connected to any output time slot without connections competing for resources; therefore, when circuits are added or adjusted, existing services are not blocked by internal matrix conflicts.

Knowledge block: time-slot cross-connection under the PCM30/32 frame structure. PCM30/32 is the frame structure standard of the E1 base group: each frame has 32 time slots and each E1 carries 30 available 64K service time slots, of which TS0 is used for frame alignment and alarms and TS16 is used for channel-associated signaling; the E1 interface of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment uses a 2.048 Mbit/s bit rate and HDB3 line coding, complies with the ITU-T G.703 standard, and performs cross-connect configuration at 64K time slot granularity, so that 2.048 Mbit/s private network channel scheduling no longer depends on manual patch cords or dedicated circuits laid one by one.

How time-slot cross-connection is configured: the cross-connection relationships of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment are delivered in the form of a configuration table, specifying one by one the input E1 channel and time slot and the output E1 channel and time slot according to the service plan; when the network is expanded or services are migrated, only the time-slot cross-connect table has to be adjusted while the transmission line and external equipment remain unchanged, and the on-site workload of circuit activation and service adjustment is reduced accordingly.

How Does PCM30/32 Channel-Associated Signaling Interconnect with Existing Network Equipment?

How PCM30/32 channel-associated signaling interconnects with existing network equipment lies in the dual consistency of the signaling mode and the interface standard. Channel-associated signaling is a signaling mechanism that passes line and voice channel status — go off-hook, hang up, ringing and dialing — together with the voice time slots; in the PCM30/32 frame structure it is passed synchronously through the TS16 time slot without building a separate signaling channel; the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment supports channel-associated signaling, so telephone services can pass transparently through the cross-connect node and intercommunicate with existing PCM switching equipment.

Interconnection with existing E1 equipment depends on consistency at the interface level. The E1 interface of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment follows the ITU-T G.703 standard, with a bit rate of 2.048 Mbit/s and HDB3 line coding, and can work in either the 75 Ω coaxial or the 120 Ω balanced impedance form; its frame structure and signaling mode are consistent with existing PCM30/32 equipment, so in upgrade scenarios the equipment at the opposite end usually does not need to be replaced and the existing transmission system does not need to be changed.

How Are n×64 kbit/s V.35 Access and Rate Steps Configured?

n×64 kbit/s V.35 access is the interface form with which the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment carries high-speed synchronous data services: the transmission rate of the V.35 interface is set as n×64 kbit/s, where n ranges from 0 to 31, so a service can occupy 0 to 31 consecutive 64K time slots; the rate step is configured according to the actual bandwidth requirement of the service, and there is no need to occupy the whole E1 channel at once.

The V.35 interface of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment uses the RJ-45 form, its electrical characteristics comply with the ITU-T V.35 recommendation and its terminal interface complies with ISO2593, making it easy to interconnect with standard V.35 devices such as routers and multiplexers; the RS-232 interface has a transmission rate of ≤9600 bit/s in asynchronous mode and 64 kbit/s in synchronous mode, its electrical characteristics comply with the CCITT V.28 protocol, and it carries low-speed asynchronous data. The V.35 and RS-232 service time slots and the voice time slots are in the same cross-connect matrix, so multiple services can share the same E1 channel.

Technical Specifications

Figure 2: Close-up of the E1 interfaces and terminal blocks on the rear panel of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment

E1 Interface Parameters (ITU-T G.703)

Audio Interface Parameters

Data Interface Parameters (RS-232 and V.35)

Power Supply and Environmental Parameters

Differentiated Value: 64K Non-Blocking Cross-Connection · PCM30/32 · n×64K V.35 · DC/AC Power Supply

Typical Application Scenarios

The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment suits industrial private network occasions that use E1 as the transmission medium and need to centrally schedule voice and data services onto the same channel; common deployments include service aggregation at substations in electric power private networks, voice channel and data upload from section stations in rail transit private networks, and simultaneous voice and data transmission between communication vehicles and forward sites in military emergency communications. As an integrated service access device that combines PCM multiplexing and DXC cross-connect functions, the product is developed and manufactured by Raytrans, which has accumulated rich private network deployment experience in the fields of time-slot cross-connect equipment and optical multiplexing equipment.

Figure 3: Installation and service access diagram of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment in a private network cabinet

Electric Power Private Network: Simultaneous Voice and Data Transmission between Substations and the Dispatch Center

In electric power private networks there are both telephone dispatching services and low-speed data services carrying protection and monitoring information between substations, switching stations and the dispatch center. The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment concentrically accesses the E1 channels of the sites and, at the 64K time slot level, cross-connects the telephone voice channels and the data time slots respectively to the corresponding E1 time slots of the dispatch center, so one E1 carries voice and data at the same time and the number of private network lines is reduced; channel-associated signaling enables direct intercommunication of telephone services with existing PCM switching equipment.

Rail Transit Private Network: Voice Channel and Data Aggregation between Section Stations and the Center

The section stations of rail transit private networks are scattered, and voice channel and data services need unified aggregation at the central side. The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment concentrates the E1 channels uploaded by the section stations into the central cross-connect node and, by 64K time slot, allocates the inter-station voice channels and the monitoring data to the corresponding channels respectively; when a station is added or service assignment is adjusted, only the time-slot cross-connection configuration has to be adjusted, and there is no need to lay a dedicated circuit separately for each station.

Military Emergency Communications: Simultaneous Voice and Data Transmission between Communication Vehicles and Forward Sites

The communication vehicles and forward sites of military emergency communications are usually not in a fixed equipment room, and the power supply conditions vary with the site. The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment supports both DC and AC power supply modes, has an overall power consumption of ≤150 W, an operating temperature of -20 °C ~ +50 °C and a relative humidity of 0~95% (non-condensing), and can be connected to the DC power supply of a communication vehicle or the AC power supply of a site and be installed in a vehicle-mounted cabinet or an outdoor cabinet; when a communication vehicle is relocated or site services change, the command node side adjusts the time-slot cross-connection configuration, so no on-site rewiring is needed, and voice channels and low-speed data are brought into the command node over the E1 transmission channel. Raytrans can provide the corresponding product showcase and technical support for military emergency communications vehicle solutions, government private network optical fiber communication solutions and smart mining communication solutions, making it easy for users to select and deploy according to actual networking requirements.

How Should Time-Slot Cross-Connect Equipment Be Selected and Deployed?

How to select time-slot cross-connect equipment usually starts with counting requirements by service type: the number of E1 channels that need cross-connection scheduling, the number of audio voice channels, and the number of V.35 and RS-232 data channels, against which the interface configuration and time slot occupation of the PCM equipment are then checked; the E1 interface impedance is selected as 75 Ω coaxial or 120 Ω balanced according to the line form at the opposite end, and the frame structure and signaling mode are selected as PCM30/32 and channel-associated signaling according to the existing transmission system.

During selection it should also be confirmed whether the cross-connect granularity is the 64K time slot and whether arbitrary time slot interconnection and time slot adjustment during later capacity expansion are supported, so as to avoid being unable to expand because cross-connect matrix resources are limited after the equipment is put into operation. As 64K time-slot non-blocking cross-connect equipment, the complete configuration list, interface board configuration and networking solution of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment can be confirmed with Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. in combination with the specific project topology, and the manufacturer will provide selection and commissioning support. In actual product showcases and solution discussions, Raytrans can, around government private network optical fiber communication solutions, military emergency communications vehicle solutions and smart mining communication solutions, have time-slot cross-connect equipment, an integrated service access device and optical multiplexing equipment incorporated into unified PCM equipment networking, making it easy to complete service analysis, capacity calculation and subsequent O&M.

Audio Interface Parameters

Data Interface Parameters (RS-232 and V.35)

Power Supply and Environmental Parameters

Differentiated Value: 64K Non-Blocking Cross-Connection · PCM30/32 · n×64K V.35 · DC/AC Power Supply

Typical Application Scenarios

The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment suits industrial private network occasions that use E1 as the transmission medium and need to centrally schedule voice and data services onto the same channel; common deployments include service aggregation at substations in electric power private networks, voice channel and data upload from section stations in rail transit private networks, and simultaneous voice and data transmission between communication vehicles and forward sites in military emergency communications. As an integrated service access device that combines PCM multiplexing and DXC cross-connect functions, the product is developed and manufactured by Raytrans, which has accumulated rich private network deployment experience in the fields of time-slot cross-connect equipment and optical multiplexing equipment.

Figure 3: Installation and service access diagram of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment in a private network cabinet

Electric Power Private Network: Simultaneous Voice and Data Transmission between Substations and the Dispatch Center

In electric power private networks there are both telephone dispatching services and low-speed data services carrying protection and monitoring information between substations, switching stations and the dispatch center. The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment concentrically accesses the E1 channels of the sites and, at the 64K time slot level, cross-connects the telephone voice channels and the data time slots respectively to the corresponding E1 time slots of the dispatch center, so one E1 carries voice and data at the same time and the number of private network lines is reduced; channel-associated signaling enables direct intercommunication of telephone services with existing PCM switching equipment.

Rail Transit Private Network: Voice Channel and Data Aggregation between Section Stations and the Center

The section stations of rail transit private networks are scattered, and voice channel and data services need unified aggregation at the central side. The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment concentrates the E1 channels uploaded by the section stations into the central cross-connect node and, by 64K time slot, allocates the inter-station voice channels and the monitoring data to the corresponding channels respectively; when a station is added or service assignment is adjusted, only the time-slot cross-connection configuration has to be adjusted, and there is no need to lay a dedicated circuit separately for each station.

Military Emergency Communications: Simultaneous Voice and Data Transmission between Communication Vehicles and Forward Sites

The communication vehicles and forward sites of military emergency communications are usually not in a fixed equipment room, and the power supply conditions vary with the site. The IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment supports both DC and AC power supply modes, has an overall power consumption of ≤150 W, an operating temperature of -20 °C ~ +50 °C and a relative humidity of 0~95% (non-condensing), and can be connected to the DC power supply of a communication vehicle or the AC power supply of a site and be installed in a vehicle-mounted cabinet or an outdoor cabinet; when a communication vehicle is relocated or site services change, the command node side adjusts the time-slot cross-connection configuration, so no on-site rewiring is needed, and voice channels and low-speed data are brought into the command node over the E1 transmission channel. Raytrans can provide the corresponding product showcase and technical support for military emergency communications vehicle solutions, government private network optical fiber communication solutions and smart mining communication solutions, making it easy for users to select and deploy according to actual networking requirements.

How Should Time-Slot Cross-Connect Equipment Be Selected and Deployed?

How to select time-slot cross-connect equipment usually starts with counting requirements by service type: the number of E1 channels that need cross-connection scheduling, the number of audio voice channels, and the number of V.35 and RS-232 data channels, against which the interface configuration and time slot occupation of the PCM equipment are then checked; the E1 interface impedance is selected as 75 Ω coaxial or 120 Ω balanced according to the line form at the opposite end, and the frame structure and signaling mode are selected as PCM30/32 and channel-associated signaling according to the existing transmission system.

During selection it should also be confirmed whether the cross-connect granularity is the 64K time slot and whether arbitrary time slot interconnection and time slot adjustment during later capacity expansion are supported, so as to avoid being unable to expand because cross-connect matrix resources are limited after the equipment is put into operation. As 64K time-slot non-blocking cross-connect equipment, the complete configuration list, interface board configuration and networking solution of the IDM DXC5200 Integrated Service Cross-Connect Multiplexing Equipment can be confirmed with Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. in combination with the specific project topology, and the manufacturer will provide selection and commissioning support. In actual product showcases and solution discussions, Raytrans can, around government private network optical fiber communication solutions, military emergency communications vehicle solutions and smart mining communication solutions, have time-slot cross-connect equipment, an integrated service access device and optical multiplexing equipment incorporated into unified PCM equipment networking, making it easy to complete service analysis, capacity calculation and subsequent O&M.