IDM OMP2400-4E1-30E Ultra-Broadband Integrated Service Optical Multiplexing Equipment

The 2.5G optical port 1+1 telephone optical multiplexer is an ultra-broadband integrated service optical multiplexing equipment developed by Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. under model IDM OMP2400-4E1-30E. As a typical PCM equipment and integrated service access device, it is used to simultaneously transmit 30 voice channels, 4 E1 leased lines, 6 physically isolated Ethernet ports and HDMI high-definition video over a pair of 2.5Gbps optical fibers, enabling product showcase and centralized backhaul of multiple services.

The equipment adopts the PCM30/31 format and multiplexes voice, E1, data and video into the same optical link over their respective channels. It is intended for cross-site multi-service backhaul in electric power and energy, rail transit communication and military and government private networks, and is an optical multiplexing equipment commonly used by optical multiplexer manufacturers in government private network optical fiber communication solutions and military emergency communications vehicle solutions. The two 2.5Gbps SFP optical ports can be configured as active and standby, and services are automatically switched to the spare fiber core when a single fiber is interrupted.

The IDM OMP2400-4E1-30E uses a standard 19-inch 1U chassis. With function control switches and alarm indications, the operating status of the site can be checked at the front of the cabinet. The 30 voice channels, 4 E1 transparent transmission channels and 6 isolated Ethernet ports are all completed within the same PCM equipment, replacing the previous deployment of stacking multiple single-function devices, with a corresponding reduction in rack space occupancy and cabling jumpers. With one unit deployed at each end and connected over a pair of optical fibers, telephone, E1 and Ethernet services are transmitted as they are.

Key specifications at a glance: 2.5G optical port 1+1 (2×2.5Gbps SFP) · 30 voice channels (FXO/FXS/magneto selectable) · 4 E1 transparent transmission channels (ITU-T G.703) · 6 isolated Ethernet ports (2×1000M+4×100M, 2400M in total) · HDMI high-definition video · dual power supply ≤100W · 19-inch 1U chassis

What kind of equipment is the 2.5G optical port 1+1 telephone optical multiplexer

The 2.5G optical port 1+1 telephone optical multiplexer is a multi-service access device that multiplexes telephone voice, E1 leased lines, Ethernet data and high-definition video onto the same pair of optical fibers for transmission. The IDM OMP2400-4E1-30E is one such PCM equipment, characterized by 2.5G bandwidth, dual optical port mutual backup and 6 physically isolated Ethernet ports.

On a single 2.5G optical link, the equipment provides 2 line-rate 1000M and 4 line-rate 100M Ethernet ports. The 6 ports are independent of one another and services do not interfere with one another. It also carries 30 voice channels and 4 E1 leased lines at the same time, making it a relatively high interface density model among integrated service access devices, and it is also often classified as optical multiplexing equipment.

Once voice, E1, Ethernet and video are consolidated into a pair of optical fibers, the only cross-site cabling work left is the optical cable, and civil works and wiring costs decrease accordingly. The IDM OMP2400-4E1-30E combines the technical characteristics of PCM equipment and PDH transmission: telephone services are accessed through PCM encoding, E1 is transparently transmitted in accordance with ITU-T G.703, and Ethernet is forwarded at line rate in accordance with IEEE802.3. The three types of services each use their own channel on the same optical link, and the interface layout shown in the product showcase also directly reflects this multi-service convergence approach.

Figure 1: Front view of the IDM OMP2400-4E1-30E ultra-broadband integrated service optical multiplexing equipment

One 1U device integrates 30 voice channels, 4 E1 groups and 6 isolated Ethernet ports

The IDM OMP2400-4E1-30E concentrates subscriber interfaces that were originally spread across multiple devices into a single 1U chassis. 30 voice channels, 4 E1 transparent transmission channels, HDMI high-definition video and 6 physically isolated Ethernet ports can operate online at the same time. A single device covers the narrowband voice, E1 leased line and broadband data interfaces at a site. The types, capacities and applicable conditions of the service interfaces are listed in the table below; the specific board configuration is subject to the ordered model:

The telephone interfaces use ITU G.711 A-law encoding with a loop current of 25mA per channel, and no additional conversion equipment is required when connecting to SPC exchanges, analog trunks and magneto telephones. The 30 voice channels each occupy an independent channel within the equipment, and off-hook on one telephone does not affect the call quality of other channels.

The E1 interfaces comply with ITU-T G.703, with HDB3 line code and selectable 75Ω/120Ω impedance, and do not change time slot content in transparent transmission mode. The data configuration of the dispatch automation equipment at the far end can be retained as is, and no re-mapping of time slots is required between the two ends.

HDMI high-definition video shares the same pair of 2.5G optical fibers with telephone and E1 services, so surveillance video and dispatch voice can be backhauled to the central equipment room together. Video and other services use their own channels, and the equipment room no longer needs to lay a separate video cable for each camera.

Figure 2: Front panel layout of the IDM OMP2400-4E1-30E with 30 voice channels, 4 E1 groups, 6 Ethernet ports and HDMI interfaces

How 2.5G optical port 1+1 protection keeps telephone and E1 services uninterrupted when a fiber breaks

2.5G optical port 1+1 protection means configuring the two 2.5Gbps SFP optical ports on the IDM OMP2400-4E1-30E as active and standby optical fiber channels. Services are normally carried over the active fiber, while the standby fiber remains in hot standby.

When the active optical port suffers a fiber break, optical module degradation or a far-end anomaly, the equipment detects the abnormal received optical power and automatically switches services to the standby optical port. The switchover is transparent to services: telephone and E1 connections need no renegotiation, and O&M personnel do not need to go on site to change jumpers or fibers.

Redundancy resides at the optical path layer rather than relying on upper-layer protocol rerouting, which for private network sites means switchover does not discriminate by service type. When any segment of fiber in a chained network, ring network or point-to-multipoint star network is interrupted, services continue to be transmitted normally over the spare fiber core, and substations, stations along the line and classified equipment rooms do not need to configure additional dual-route protection switching protocols for this purpose.

Figure 3: Rear panel layout of the IDM OMP2400-4E1-30E with 2 SFP optical ports and dual power connectors

How 6 physically isolated Ethernet ports are divided to ensure service security

The security of the 6 physically isolated Ethernet ports (2×1000M+4×100M) is ensured by each group of ports using an independent channel inside the equipment, sharing neither bandwidth nor forwarding resources. The IDM OMP2400-4E1-30E provides 2 line-rate 1000M and 4 line-rate 100M Ethernet ports, with 2400M of physically isolated Ethernet in total and independent line rates of 2×1000M+4×100M; when one group is fully loaded, the other groups continue forwarding as usual.

During deployment, services are assigned to different ports according to network security levels, following the principle that important services occupy dedicated ports and similar traffic is consolidated into the same group. With this division, maintenance or expansion of any one group of ports does not affect other networks, and port usage can be identified at a glance from the cabling labels. Common port assignments are as follows:

• Video surveillance: occupies 1 group of 100M ports; camera streams are backhauled separately and do not share traffic with office traffic;

• Office and inspection: occupies another group of 100M ports for daily O&M terminals at the site;

• Dispatch data: occupies 1 group of 1000M ports, carrying real-time data between the dispatch master station and the site;

• Production data: occupies another group of 1000M ports, isolated from the dispatch network.

The networks are physically isolated from one another and invisible to one another, and servicing one group of ports alone does not affect other services. Compared with connecting multiple services to the same ordinary switch, this approach provides clearer network zoning boundaries and better fits the zoning management requirements of the power, rail transit and classified industries. As an integrated service access device, the equipment can carry the zoned voice and data access in government private network optical fiber communication solutions, is also suitable for the rapid commissioning scenarios of military emergency communications vehicle solutions, and plays the role of optical multiplexing equipment in multi-service backhaul along rail transit communication lines. As an optical multiplexer manufacturer, Raytrans can provide corresponding products and solution support for the above scenarios.

Core technical specifications

As a PCM equipment for multi-service carrying in private networks, the IDM OMP2400-4E1-30E has core specifications covering six parts: optical interfaces, E1 interfaces, Ethernet interfaces, telephone interfaces, video and power supply and environment. Key indicators are listed in the table below. Values are subject to the manufacturer's technical documentation and factory testing; during project selection, calculations should be made according to the actual line and service volume, and the optical module distance grade should be determined separately based on the link loss budget.

Figure 4: Side heat dissipation and grounding terminal details of the IDM OMP2400-4E1-30E chassis

Typical Application Scenarios

As a multi-function PCM equipment and integrated service access device, the IDM OMP2400-4E1-30E is mainly deployed in three types of private networks: electric power and energy, rail transit, and military and government. The common requirement across these sites is to send telephony, E1, isolated data and video back to the center over a pair of optical fibers, without accepting long downtime.

Electric Power and Energy Private Network

Substations, power plants and distribution automation sites need to transmit dispatch telephone, automation E1 leased lines and in-station data network simultaneously. With one IDM OMP2400-4E1-30E at each site, inter-station dispatch audio, E1 leased-line channels and isolated Ethernet are multiplexed over a pair of 2.5G optical fibers, and the central side collects all services over a single pair of optical fibers.

The telephone interfaces use ITU G.711 A-law with a loop current of 25mA per channel and connect directly to dispatch voice channel equipment, while 4 groups of E1 transparent transmission free the opposite-end automation devices from configuration changes. With 2.5G optical port 1+1 protection enabled, if any section of the inter-station optical cable is interrupted, telephone and E1 services automatically switch over to the spare fiber core, and the dispatch console does not need to redial.

Rail Transit Communication

Metro and conventional railway stations along the line and tunnel sections, as well as expressway toll stations and monitoring sub-centers, need to aggregate along-the-line telephony, E1 trunks, video surveillance and network data back to the central equipment room. One IDM OMP2400-4E1-30E at each station along the line accesses telephone voice channels, E1 leased lines, HDMI video and network data at the same time and sends them to the center over 2.5G optical fibers, forming a complete rail transit communication service backhaul node.

The device supports dual power supply of DC-48V and AC220V with overall power consumption ≤100W, suitable for long-term operation in unattended equipment rooms along the line. The 6 physically isolated Ethernet interfaces let surveillance, office and dispatch networks each use independent ports without interfering with one another, and inspection of one port does not affect the other networks.

Military and Government Private Network

Field training sites, emergency command posts and government classified equipment rooms emphasize one terminal, many uses and reliable operation. A single IDM OMP2400-4E1-30E carries 30 telephone channels, 4 groups of E1, 6 isolated Ethernet interfaces and HDMI video at the same time, reducing the number of units and cable deployment; during relocation and deployment, only one 1U device needs to be moved, and it can serve as the core access node in a military emergency communications vehicle solution for quick deployment.

Optical port 1+1 protection ensures that command and dispatch telephone services are not interrupted when a single optical fiber fails. Dual power supply supports both DC-48V and AC220V equipment room conditions, making it easy to operate from vehicle power supply or emergency power supply; overall power consumption ≤100W reduces the load on vehicle and shelter power supply. In a government private network optical fiber communication solution, the device can likewise provide integrated access of voice and data at remote stations.

Figure 5: Point-to-point networking schematic of two IDM OMP2400-4E1-30E units with 2.5G optical fiber mutual backup

Differentiated Value: What 2.5G Optical Port 1+1 and 6 Isolated Ethernet Interfaces Bring

The differentiated value of the IDM OMP2400-4E1-30E centers on three aspects: optical path redundancy, service convergence and network isolation. The capabilities and on-site benefits corresponding to the four short labels are listed in the table below, and during selection you can compare service requirements row by row.

How to Select an Optical Multiplexing Equipment

To select an optical multiplexing equipment, check the four items of number of service channels, fiber conditions, redundancy requirements and power supply environment one by one to close the loop. These four items correspond to the four types of information that easily cause rework on site: first determine interface capacity, then optical module distance, then check redundancy and power supply, and the configuration list can be finalized in one pass. As a professional optical multiplexer manufacturer, Raytrans has summarized the following check sequence in the selection practice of PCM equipment and integrated service access devices, and the four check items are as follows:

1. Count the number of service channels: confirm the number of telephone channels (the IDM OMP2400-4E1-30E provides 30, with FXO/FXS/magneto options), the number of E1 channels (1-4), the number of Ethernet ports and whether physical isolation is required, and whether HDMI video is transmitted; if the interface type or quantity does not match, change the model or add boards.

2. Check fiber conditions: confirm single-mode or multi-mode, whether the wavelength is 1310nm or 1550nm, and the link loss budget; determine the distance grade of the SFP optical module based on the transmit optical power of -1~-3dBm and receiver sensitivity better than -24dBm.

3. Confirm redundancy requirements: enable 2.5G optical port 1+1 protection on lines where the inter-station optical cable is easily damaged, with the two optical ports as hot standby for each other; where only a single optical cable is available, at least reserve spare optical modules and spare parts.

4. Check power supply and environment: DC-48V, AC220V or dual power supply must match the site power supply, overall power consumption ≤100W, operating temperature 0℃～40℃, humidity ≤90% (non-condensing); installation in a standard equipment room or in a temperature-controlled cabinet is recommended.

Conclusion

The 2.5G optical port 1+1 telephone optical multiplexer IDM OMP2400-4E1-30E aggregates 30 telephone channels, 4 groups of E1 transparent transmission, 6 physically isolated Ethernet interfaces (2×1000M+4×100M) and HDMI high-definition (HD) video onto a pair of 2.5G optical fibers, and dual-optical-port automatic switchover on fiber break keeps telephone and E1 services uninterrupted.

With DC-48V/AC220V dual power supply and overall power consumption ≤100W, it is suitable for multi-service-over-one-fiber networking in electric power and energy, rail transit communication, and military and government private networks. Raytrans can provide corresponding PCM equipment and product showcase configuration recommendations for government private network optical fiber communication solutions, military emergency communications vehicle solutions and rail transit communication scenarios. During selection, first count the number of telephone, E1, Ethernet and video channels, then calculate the link loss and check the power supply and environmental conditions; for a complete networking solution and quotation, please contact Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. (www.rdtcom.com, 010-51668966).