IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment

The IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment is a 2-channel E1 integrated service cross-connect multiplexing equipment developed by Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. (Raytrans), used for service access and cross-connection at the access layer of data communication networks. This PCM equipment provides non-blocking cross-connection at 64K granularity across 2 E1 channels within a 19-inch 1U chassis, and can provide 30 channels of 64K services, covering telephone, magneto telephone, common battery telephone, and V.24 data services, meeting the diverse product showcase requirements of the access layer.

The 2 E1 channels can be configured in mutual backup mode, or in cascading mode as time-slot cross-connect equipment; 15 service card slots allow FXS, FXO, magneto, E&M 2/4-wire, and serial port data to be mixed and accessed within the same unit. As an integrated service access device, the IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment supports AC 220 V or DC -48 V power supply, with an operating temperature of -10℃~+50℃, and can be deployed at access nodes of electric power, rail transit, and military and government private networks, adapting to application scenarios such as government private network optical fiber communication solutions and military emergency communications vehicle solutions.

Key Specifications at a Glance: 2E1 mutual backup · 15 slots · AC/DC dual power supply · 1U 19-inch · 30 channels of 64K services · 2.048Mbps E1

Figure 1: Front view and operating indicator LEDs of the IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment

What kind of equipment is the 2-channel E1 integrated service cross-connect multiplexing equipment?

The 2-channel E1 integrated service cross-connect multiplexing equipment is an integrated access and cross-connect device with 64K time slots as the scheduling granularity: one side accesses 2 E1 channels, while the other side provides voice channels and data interfaces through service cards. After services enter the device, they are uniformly split into 64K time slots and then allocated to designated time slots of the target E1 channel according to configuration. All time slots of the 2 E1 channels can participate in cross-connection, any input time slot can be scheduled to any output time slot, and connections do not compete for matrix resources with each other.

Placing cross-connection scheduling capability at the access layer is what distinguishes the 2-channel E1 integrated service cross-connect multiplexing equipment from ordinary PCM equipment. Telephones and data at the site side do not need to be aggregated to the central equipment room first and then queued for scheduling; time slot allocation can be completed locally. The site only needs one E1 line for access, occupies 1U of cabinet space, and when service types change, only the service card needs to be replaced, without replacing the entire unit or the existing lines. As a PCM equipment oriented to terminal sites, this device can be used as an integrated service access device in both government private network optical fiber communication solutions and military emergency communications vehicle solutions, achieving unified bearer of voice and data through 64K service cross-connect multiplexing.

How to choose between 2E1 mutual backup and time slot extraction modes?

The choice between 2E1 mutual backup and time slot extraction depends on service flow: if all services are sent to the same peer site, choose mutual backup; if services are sent to two directions or two types of systems, choose time slot extraction. The basis for judgment is the peer addresses on the service list, not link bandwidth or the number of interfaces.

• Mutual backup mode: The two E1 channels carry the same batch of services, one primary and one backup; when the primary link is interrupted or bit errors exceed the usable range, services continue to be transmitted over the backup link, and the site does not need to replace equipment or reconfigure service cards.
• Time slot extraction mode: The two E1 channels each carry allocated time slots, and the device extracts the required time slots from the two E1 channels for different services; one E1 is reserved for dispatch telephones, while the other carries telecontrol data or video monitoring, and services in the two directions are allocated within the same time-slot cross-connect equipment.

For mutual backup to truly work, the two E1 channels should come from different transmission paths. When both E1 channels run over the same optical fiber cable or pass through the same upstream device, the backup effect is offset by the common point of failure; during on-site line inspection, verify the path source one by one according to the patch panel labels, and then determine the mode configuration.

What 64K services can be mixed in the 15 slots?

The 15 service card slots are where the access capacity of the IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment lies. Each card provides two service channels, and a full configuration can provide 30 channels of 64K narrowband service access. Voice and data are accessed in a mixed manner within the same device, then allocated to target E1 time slots by the 64K cross-connect matrix, and the transmit and receive ends select cards in pairs according to service type.

Service Card Type	Interface Standard and Parameters	Typical Access Objects
FXS	Audio 300Hz~3400Hz, G.711 A-law, loop current 20mA/channel	Site office telephones, dispatch telephones, fax machines
FXO	Audio 300Hz~3400Hz, G.711 A-law, three-element complex impedance 200Ω+560Ω//0.1μF	Switch subscriber lines, local exchange trunks
Magneto	Audio 300Hz~3400Hz, balanced 600 Ω, return loss no less than 18 dB	Magneto telephones, dispatching exchanges, common battery telephones
E&M 2/4-wire	Audio 300Hz~3400Hz, balanced 600 Ω, G.711 A-law	Audio trunks, public address and amplification equipment
V.24/RS232/RS422/RS485	Asynchronous ≤9600bps, synchronous 64Kbps, compliant with CCITT V.28 protocol	Telecontrol terminals, serial port acquisition devices
Codirectional 64K	G.703 standard, 64Kbps, balanced 120Ω	Protection signals, leased-line data
V.35/V.36	n×64Kbps (n=0～31), RJ-45, compliant with ISO2593	Router WAN ports, synchronous data terminals
Ethernet bridge	RJ-45, N×VC12, supports IEEE802.3	Remote Ethernet interconnection

Figure 2: Rear panel E1 interfaces and service wiring terminal layout of the IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment

Card configuration follows three steps: first, count the number of telephone, magneto, EM audio, and serial port data channels required at the site, and determine the number of each type of service card; then check the time slot occupation of the 2 E1 channels, and allocate the 30 channels of 64K services to the two E1 channels by direction; finally, use serial port network management or Ethernet SNMP network management to verify that the configuration matches the actual services. When the site is expanded, interfaces are added by inserting cards, while the main chassis and existing E1 lines remain unchanged.

What are the core functions?

The functions of the IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment revolve around three threads: dual E1 links, 64K service access, and PCM multiplexing. The function items and their roles are shown in the table below. The function items in the table are grouped by link, access, and maintenance. During selection, compare them item by item against the actual services of the project; function items not needed can be left unconfigured.

Function	Description
2E1 mutual backup	The two E1 channels carry the same batch of services; when the primary link is abnormal, services switch to the backup link, ensuring the reliability of the dual E1 links
Time slot extraction (cascading)	The two E1 channels separately carry allocated time slots; when services are sent in two directions, one device completes access in both directions
15 slots for mixed insertion	The main board provides 15 service card slots, each card provides two service channels, and voice cards and data cards are combined as needed
30 channels of 64K service access	A full configuration provides 30 channels of 64K narrowband services, carrying telephone, magneto, common battery, and V.24 data services in a mixed manner
PCM multiplexing	64K services are multiplexed into 2.048Mbps E1 channels according to the PCM30/32 frame structure, and voice is encoded according to G.711 A-law
64K time slot cross-connection	All 64K time slots of the 2 E1 channels participate in non-blocking cross-connection, and any time slot can be scheduled to any time slot
Synchronous timing	Complete synchronous timing functions provide a unified clock reference for E1 channels and subscriber interfaces
Network management	Provides serial port network management or Ethernet SNMP network management for remote viewing of link and service status
Dual power supply options	AC 220 V or DC -48 V power supply, selected according to existing power supply conditions at equipment rooms and field sites

Technical Specifications

The E1 interface and audio interface specifications of the IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment correspond to public recommendations such as ITU-T G.703, PCM30/32, and ITU-T G.711. The V.24 interface complies with the CCITT V.28 protocol, and the V.35 interface complies with ITU-T V.35 recommendations. The parameters below are taken from publicly available product technical documentation; specific configurations are subject to the manufacturer's technical documentation and commercial confirmation.

Parameter	Specification	Description/Applicable Conditions
Number of E1 channels	2	Non-blocking cross-connection at 64K granularity across 2 E1 channels, configurable as mutual backup or time slot extraction
E1 bit rate	2.048Mbps	Standard E1 line rate
E1 line coding	HDB3	Line coding compliant with ITU-T G.703
E1 standard protocol	Supports ITU-T G.703	International standard followed by the E1 interface
E1 impedance	75 Ω/120 Ω	Select 75 Ω coaxial or 120 Ω balanced according to the peer line
E1 frame structure	PCM30/32	32 time slots per frame, 30 time slots carry services
E1 signaling	Channel-associated signaling	Line and voice channel status are transmitted along with voice time slots
64K service capacity	30 channels	Full configuration of 15 slots, two service channels per card
Service card slots	15	Each card provides two service channels
FXS, FXO interfaces	Audio 300Hz~3400Hz, compression G.711 A-law	Three-element complex impedance 200Ω+560Ω//0.1μF, loop current 20mA/channel
Magneto interface	Audio 300Hz~3400Hz, balanced 600 Ω	Compression G.711 A-law, return loss no less than 18 dB
E&M 2/4-wire interface	Audio 300Hz~3400Hz, balanced 600 Ω	Compression G.711 A-law, return loss no less than 18 dB
Codirectional 64K interface	Coding G.703 standard, bit rate 64Kbps	Impedance balanced 120Ω, fully compliant with ITU G.703 recommendations
V.24/RS232 interface	Asynchronous ≤9600bps; synchronous 64Kbps	Electrical characteristics comply with CCITT V.28 protocol
V.35 interface	Interface type RJ-45, transmission rate n×64Kbps (n=0～31)	Electrical characteristics comply with ITU-T V.35 recommendations, terminal interface complies with ISO2593
Ethernet bridge	RJ-45, transmission rate N×VC12	Supports IEEE802.3, operating mode full/half duplex/adaptive
Network management mode	Serial port network management or Ethernet SNMP network management	Subject to the manufacturer's technical documentation and commercial confirmation
Power supply mode	AC220V/DC-48V	AC and DC power supply modes are optional
Overall power consumption	≤150W	Upper limit of overall power consumption
Operating temperature	-10℃~+50℃	Communications equipment room and outdoor cabinet environments
Relative humidity	0~95% (non-condensing)	Normal operation under non-condensing conditions
Product dimensions	482×309×44(mm)	19-inch 1U chassis dimensions, length × depth × height

How is 64K time slot cross-connection implemented?

The implementation of 64K time slot cross-connection depends on two conditions: cross-connect granularity and matrix resources. The IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment establishes connection relationships in units of 64K time slots. All time slots of the 2 E1 channels can participate in cross-connection, any input time slot can be scheduled to any output time slot, and connections do not compete for matrix resources with each other, so existing services are not affected when circuits are added or adjusted. As time-slot cross-connect equipment, its cross-connect capability is configured item by item within the PCM30/32 frame structure at the granularity of 64K service cross-connect multiplexing, and scheduling flexibility is not limited by physical port locations.

Knowledge block: PCM30/32 frame structure and E1 interface standards. PCM30/32 is the E1 base group frame structure, with 32 time slots per frame, where TS0 is used for frame alignment and alarms, TS16 for channel-associated signaling (CAS), and the remaining 30 time slots carry 64K services; the E1 interface has a bit rate of 2.048Mbps and HDB3 line coding, complies with ITU-T G.703, and cross-connect configuration is performed at 64K time-slot granularity, so circuit adjustments at access nodes do not depend on patch cords.

Cross-connection relationships are delivered as configurations, specifying the input E1 channel and time slot and the output E1 channel and time slot for each service according to the service plan. When a site is expanded or services are migrated, only the cross-connect configuration is changed, while the external lines and the opposite-end devices remain untouched, and the on-site workload is reduced accordingly; 2 E1 channels can therefore complete 64K-level service scheduling within a single device without adding a separate cross-connect device. This 2-E1 integrated service cross-connect multiplexing equipment integrates time-slot cross-connection, service access and multiplexing within a 1U chassis, and when used as an integrated service access device it can significantly simplify the device composition of access nodes.

How Does AC220V/DC-48V Dual Power Supply Adapt to Equipment Rooms and Field Sites?

The AC220V/DC-48V dual power supply option means that the same device can be connected to either an AC 220V power supply or a DC -48V power supply, and the site selects one according to its existing power supply conditions, with overall power consumption ≤150W. Substations and communications equipment rooms usually have both mains power and DC power systems, while field sites more often use -48V storage battery banks; the same model can cover both types of sites, with unified spare parts and O&M practices.

The IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment has an operating temperature of -10℃+50℃, a relative humidity of 095% (non-condensing), and dimensions of 482×309×44 (mm), and can be installed in a standard 19-inch rack or a vehicle-mounted rack; before wiring, check the output voltage and capacity of the power distribution panel first, and the installation method is the same for both the AC and DC models. Raytrans takes both equipment room and field scenarios into account in the power supply design of this PCM equipment series, so that the same model can cover the widely differing power supply conditions in government private network optical fiber communication solutions and military emergency communications vehicle solutions.

Figure 3: Installation and power supply wiring of the IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment in a substation communications cabinet

How to Select an Integrated Service Cross-Connect Multiplexing Equipment?

To select an integrated service cross-connect multiplexing equipment, first determine the capacity according to the site service list, and then determine the E1 configuration and working mode according to the line conditions. The following five items are the points to be checked one by one during selection; once the capacity, mode, interfaces and power supply are checked, the configuration list can be finalized.

• Service types and number of channels: count the number of telephone, magneto, EM audio, serial port data and Ethernet interconnection channels, and determine the types and quantities of service cards accordingly.
• E1 channels and mode: if there is only a single service flow direction and high continuity requirements, choose 2E1 mutual backup; if services are sent in two directions, choose time slot extraction mode.
• Interface specifications and impedance: select 75 Ω coaxial or 120 Ω balanced E1 impedance according to the opposite end; select FXS, FXO, magneto or EM 2/4-wire audio services according to the opposite-end device.
• Power supply and environment: choose AC220V for AC equipment rooms and DC-48V for DC power supply sites, and check the operating temperature and humidity ranges as well for field cabinets.
• Network management and capacity expansion: confirm whether serial port network management or Ethernet SNMP network management is configured, and reserve slots for future service growth.

During selection, the actual deployment scenario of the PCM equipment should also be considered: government private network optical fiber communication solutions focus on a complete set of multi-service interfaces and network management capabilities, while military emergency communications vehicle solutions pay more attention to chassis size, power supply adaptability and rapid commissioning capability; both types of scenarios can be covered by the same integrated service access device.

Differentiated Value

Differentiated capability	Value to users
2E1 mutual backup	With one E1 active and one standby, services are switched to the backup link when the primary link is interrupted, dual-E1 link reliability is guaranteed, and dispatch telephone and telecontrol data do not lose their paths at the same time
15 groups of mixed-insertion slots, 1U chassis	Telephone, magneto, EM audio and serial port data are accessed on one device, with full configuration supporting 30 channels of 64K services, so access nodes do not need to cascade multiple single-function devices, and cabinet space and supporting power supply are reduced accordingly
AC220V/DC-48V dual power supply option	AC equipment rooms and DC power supply sites use the same model, with unified spare parts and O&M practices, and neither equipment room renovation nor temporary field sites need a separate model

The above capabilities rely on the time-slot cross-connect architecture and integrated service access design presented in the PCM and product showcase, and Raytrans positions this PCM equipment series for scenarios such as government private network optical fiber communication solutions and military emergency communications vehicle solutions that have clear requirements for reliability and mixed service access, making it easy for users to complete configuration decisions directly against the service list during the selection stage.

Typical Application Scenarios

As a typical PCM equipment, the IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment is suitable for private network access nodes that use E1 as the transmission medium and have a mixed variety of on-site service types; the differences among the three industries mainly lie in the dual-E1 working mode and the combination of service cards. The networking structure is mostly point-to-point, with one device at each end connected by an E1 channel, and services configured symmetrically at both ends; the flexibility shown in the product showcase is exactly reflected in this on-demand combination of access capabilities.

Electric Power Private Network: Dispatch Telephone and Telecontrol Data Carried by One Device in Substations

Between a substation and the dispatch center there are usually two types of services, dispatch telephone and telecontrol data, and the transmission equipment provides one or two E1 channels. The IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment uses FXS/FXO cards to connect dispatch telephones and switch subscriber lines, and V.24 or RS232 cards to connect telecontrol terminals; the two types of services are multiplexed onto the E1 channel and sent to the dispatch center, so one integrated service access device takes the place of the previous combination of a telephone optical multiplexer plus a data converter.

When the dual E1 is configured for mutual backup, services are switched to the other link after one link is interrupted, and dispatch telephone and telecontrol data do not lose their paths at the same time due to a single link failure. When the station has both an AC panel and DC power, choose the AC220V or DC-48V model according to the site conditions, with spare parts and wiring methods kept consistent.

Rail Transit Communication: Aggregation of Voice Channels and Monitoring Data in Section Equipment Rooms

The section equipment rooms and stations of rail transit are scattered, the E1 channels reserved at each site are limited, yet the services to be connected on site include section telephones, PA audio and monitoring data. The IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment implements these services on separate service cards inserted into the same 1U chassis, presents only one or two E1 line interfaces externally, and occupies 1U of space in the cabinet.

Section telephones are sent to the central dispatch center and monitoring data to the integrated monitoring system; when the two opposite ends are different, the two E1 channels are configured in time slot extraction mode, each carrying the allocated time slots. When new services are added, cards are added in free slots, the existing E1 channels and wiring remain untouched, and the upgrade does not require shutting down existing voice channels.

Military and Government Private Networks: Cross-Connect Multiplexing for Vehicle-Mounted and Fixed Sites

Sites in military and government private networks have many interface types and non-uniform line sources, including E1 channels provided by existing microwave and optical transmission equipment as well as temporarily set up circuits. As a time-slot cross-connect equipment, the IDM MAP2E1-30 Integrated Service Cross-Connect Multiplexing Equipment provides mixed insertion access for telephone, magneto, EM audio and serial port data, and then allocates them to the target E1 time slots through the 64K cross-connect matrix, making it suitable for service interfacing between command posts and forward sites; Raytrans can provide corresponding configuration recommendations for government private network optical fiber communication solutions and military emergency communications vehicle solutions.

When a communication vehicle and a fixed station building set up a channel, one device is placed at each end, and the AC220V/DC-48V dual power supply option allows the vehicle-mounted DC power supply and the station building AC power supply to use the same model; when one path is interrupted, the other E1 carries the traffic, and link backup and service access are completed within the same device, so no separate switching device is needed on site.

Conclusion

The value of the 2-E1 integrated service cross-connect multiplexing equipment lies in packing dual-E1 links, 64K service cross-connect multiplexing and cross-connection scheduling into a single 1U unit: 2E1 mutual backup guarantees link reliability, 15 groups of mixed-insertion slots cover telephone, magneto, EM audio and serial port data, and the AC220V/DC-48V dual power supply adapts to equipment rooms and field sites. Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. can confirm service card configurations and working modes according to the site topology, and provide selection and commissioning support.