IDM DXC5200

The IDM DXC5200 Time-Slot Cross-Connect Equipment is a time-slot cross-connect device developed by Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. for E1-based transmission, used to perform 64 kbit/s time slot (TS) cross-connections and scheduling of voice and data services between 2.048 Mbit/s E1 channels. The IDM DXC5200 Time-Slot Cross-Connect Equipment complies with the ITU-T G.703 standard, adopts the PCM30/32 frame structure and HDB3 line coding, provides E1 interfaces, audio interfaces and V.35, RS232 data interfaces, and supports channel-associated signaling (CAS); it is suitable for carrier-class time-slot cross-connect applications in private networks and public networks.

What Is Time-Slot Cross-Connect Equipment

Time-slot cross-connect equipment is communications equipment that uses the 64 kbit/s time slot (TS) as the smallest scheduling unit and performs cross-connections and service provisioning between E1 digital channels on demand; it is a key node for circuit scheduling and switching in a PCM primary group network. The IDM DXC5200 Time-Slot Cross-Connect Equipment uses 2M transmission media to connect user terminal equipment with each other or with the public switched telephone network (PSTN), bringing scattered voice and data services into E1 channels for unified transmission; when the network requires capacity expansion or service adjustment, only the cross-connect configuration has to be modified, without changing the transmission lines.

The IDM DXC5200 Time-Slot Cross-Connect Equipment adopts the PCM30/32 frame structure. Each E1 can carry 30 64 kbit/s service time slots and, together with channel-associated signaling (CAS) and multiple interface types, provides flexible, transparent time-slot-level scheduling for circuit-mode services such as telephony and low-speed data without changing the existing PCM switching network; it is a typical 2.048 Mbit/s cross-connect equipment.

Core Capabilities of the IDM DXC5200 Time-Slot Cross-Connect Equipment

The IDM DXC5200 Time-Slot Cross-Connect Equipment integrates time-slot cross-connections, non-blocking cross-connections, mutual backup of main control units, channel-associated signaling (CAS) support and multiple interface types into a single unit; its main functions are listed in the table below.

Function	Description
Time-slot cross-connection	Performs 64 kbit/s time-slot-level cross-connections between E1 channels, scheduling voice and data services to designated channels and time slots on demand
Non-blocking cross-connection	The cross-connect matrix has sufficient internal resources: any input time slot can be scheduled to any output time slot, so service adjustments are never blocked by internal conflicts
Mutual backup of main control units	The main control units back each other up; when the active main control fails, the standby main control takes over, ensuring stable cross-connect configuration
Channel-associated signaling (CAS) support	Supports the channel-associated signaling (CAS) of the PCM30/32 frame structure; telephone status is carried synchronously with the voice channel, making it easy to interconnect with existing PCM telephone networks
Support for multiple interface types	Provides E1 interfaces, audio interfaces and V.35, RS232 data interfaces, so voice and data services can be accessed in a mixed manner on the same device

How Time-Slot Cross-Connections Are Implemented

Cross-connections in the IDM DXC5200 Time-Slot Cross-Connect Equipment are based on the PCM30/32 frame structure. PCM30/32 is the common frame format of the E1 primary group: each frame contains 32 time slots, of which 30 carry voice or data services, TS0 is used for frame alignment and alarms, and TS16 is used for channel-associated signaling (CAS). Voice signals undergo A-law companding in accordance with ITU G.711 and are placed into the corresponding time slots at 64 kbit/s, matching the established arrangement of PCM30/32 frame structure equipment.

The E1 interfaces of the IDM DXC5200 Time-Slot Cross-Connect Equipment use a 2.048 Mbit/s bit rate and HDB3 line coding, comply with the ITU-T G.703 standard, and can operate at either 75 Ω coaxial or 120 Ω balanced impedance. Cross-connections are made at 64 kbit/s time-slot granularity: a service time slot in any E1 can be cross-connected to a designated time slot of another E1, and service time slots for audio, V.35 and other services are also brought into the same scheduling matrix, upgrading point-to-point PCM voice channels into a flexibly provisioned cross-connect network. As an HDB3 line-coded time-slot cross-connect device, it is fully compatible with standard PCM primary group equipment at the line coding level.

What Interfaces Does the DXC5200 Support

The IDM DXC5200 Time-Slot Cross-Connect Equipment provides E1 interfaces, audio interfaces and data interfaces (V.35, RS232) according to service type; the main parameters of each interface are listed in the table below.

Item	Parameter/Specification	Description/Applicable Conditions
E1 interface bit rate	2.048Mbps	Standard E1 line rate
E1 line coding	HDB3	Complies with the ITU-T G.703 standard
E1 interface impedance	75Ω/120Ω	75 Ω coaxial or 120 Ω balanced interface
E1 frame structure	PCM30/32	32 time slots per frame, 30 of which carry services
E1 signaling mode	Channel-associated signaling (CAS)	Channel-associated signaling (CAS) carries line and voice channel status in the TS16 time slot
Audio frequency range	300Hz~3400Hz	Frequency band of analog audio voice channels
Voice compression method	A-law of ITU G.711	Voice encoding uses A-law at 64 kbit/s
Audio interface impedance (balanced interface)	Balanced 600 Ω	Balanced audio line access
Audio return loss	Not less than 18 dB	Specification of the balanced 600 Ω interface
Audio interface impedance (complex impedance)	Three-element complex impedance 200 Ω + 560 Ω // 0.1 μF	Audio connection on the analog exchange side
Audio loop current	20 mA per channel	Loop current specification required for audio voice channel operation
V.35 interface type	RJ-45	Electrical characteristics comply with ITU-T Recommendation V.35
V.35 transmission rate	n×64Kbps（n=0~31）	Occupies 1–31 64 kbit/s time slots as required by the service
V.35 terminal interface	Complies with ISO 2593	Mates with standard V.35 connectors
RS232 transmission rate	Asynchronous ≤ 9600 bit/s; synchronous 64 kbit/s	Low-speed asynchronous or single-time-slot synchronous data
RS232 electrical characteristics	Complies with the CCITT V.28 protocol	Standard RS232 level interface
Power supply mode	DC/AC	DC or AC power supply selectable
Overall power consumption	≤150W	Maximum overall power consumption
Operating temperature	-20℃~+50℃	Suitable for both general equipment room and outdoor cabinet environments
Relative humidity	0–95% (non-condensing)	Operates normally under non-condensing conditions

Typical Application Scenarios

The IDM DXC5200 Time-Slot Cross-Connect Equipment is suitable for applications that use E1 as the transmission medium and require centralized scheduling of voice and data services. Typical deployments include circuit aggregation between the central equipment room and remote stations, telephone service interconnection among multiple PCM devices, and transmission of mixed audio, V.35 and RS232 services over the same network; it is a typical representative of E1 time-slot cross-connect equipment in carrier-class time-slot cross-connect applications.

Figure 2: Networking diagram of the IDM DXC5200 Time-Slot Cross-Connect Equipment for service access applications

Telephone Service Aggregation Between the Central Office and Remote Stations

In a private network telephone network, remote stations usually need to send multiple audio voice channels to the switching equipment at the central office. The IDM DXC5200 Time-Slot Cross-Connect Equipment cross-connects the voice accessed from remote audio interfaces into the upstream E1 channel in the form of 64 kbit/s time slots, and the equipment on the central side converts the E1 back to exchange interfaces, achieving centralized aggregation and unified scheduling of telephone services.

Service Interworking Between Multiple PCM Systems

When a network contains PCM devices from different batches and with different configurations, the IDM DXC5200 Time-Slot Cross-Connect Equipment can act as a common cross-connect node and aggregate the E1 channels of each PCM system. Through time-slot-level cross-connections, the service time slots of one system are connected to the corresponding time slots of another system, and signaling is carried by channel-associated signaling (CAS) cross-connection, so that telephones across systems can call each other without laying a dedicated direct route for each pair of PCM systems.

Mixed Access of Voice and V.35, RS232 Data

The IDM DXC5200 Time-Slot Cross-Connect Equipment supports carrying audio, V.35 and RS232 services in the same cross-connect matrix. The V.35 interface occupies multiple time slots at n × 64 kbit/s (n = 0–31) to carry high-speed synchronous data, the RS232 interface carries asynchronous low-speed data, and voice occupies standard 64 kbit/s voice channel time slots; the multiple services share the E1 bandwidth and are transmitted together, saving line resources.

Selection and Deployment Recommendations

When selecting the IDM DXC5200 Time-Slot Cross-Connect Equipment, first collect statistics on the number of E1 links to be cross-connected and scheduled, the number of audio channels, and the number of V.35 and RS232 data channels, and plan the time slot occupancy and interface configuration accordingly; choose 75 Ω coaxial or 120 Ω balanced impedance for the E1 interfaces according to the line form at the far end. The IDM DXC5200 Time-Slot Cross-Connect Equipment supports channel-associated signaling (CAS) and can interconnect directly with existing PCM networks that use the PCM30/32 frame structure; on site, it is recommended to first carry out time-slot cross-connection and signaling commissioning before putting services into operation. No information on differentiated selling points is currently available in the knowledge base here, and it is recommended to confirm with the manufacturer according to specific project requirements; for complete configuration and networking solutions, please contact Beijing Ruiguang Jiyuan Digital Technology Co., Ltd., which will provide selection and commissioning support based on the actual network topology.