IDM OMP2400 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. (Raytrans) under model IDM OMP2400-4E1-30E. As a PCM equipment designed for multi-service scenarios, it is used to simultaneously transmit 30 telephone channels, 4 groups of E1 leased lines, 6 physically isolated Ethernet ports and HDMI high-definition video over a pair of 2.5Gbps optical fibers. The equipment adopts the PCM30/31 format and multiplexes voice, E1, data and video into the same optical link through their respective channels. It is intended for cross-site multi-service backhaul in electric power and energy, rail transit, and military and government private networks, and can serve as an integrated service access device undertaking the multi-service aggregation node 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; when a single fiber is interrupted, services are automatically switched to the spare fiber core.

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 telephone channels, 4 groups of E1 transparent transmission and 6 isolated Ethernet ports are all completed within a single device, replacing the previous deployment approach of stacking multiple single-function devices, with a corresponding reduction in rack space occupancy and cable patching. 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. As a professional optical multiplexer manufacturer, Raytrans continues the compact design approach of optical multiplexing equipment in this model, facilitating rapid product showcase and deployment in government private network optical fiber communication solutions and military emergency communications vehicle solutions.

Key Specifications at a Glance: 2.5G optical port 1+1 (2×2.5Gbps SFP) · 30 telephone channels (FXO/FXS/magneto selectable) · 4 groups of E1 transparent transmission (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 model, characterized by 2.5G bandwidth, dual optical port mutual backup and 6 physically isolated Ethernet ports. As a typical PCM equipment and integrated service access device, it provides 2 groups of line-rate 1000M and 4 groups of line-rate 100M Ethernet ports on a single 2.5G optical link. The 6 groups of ports are independent of one another and their services do not interfere with one another, while the device simultaneously carries 30 telephone channels and 4 groups of E1 leased lines.

Once voice, E1, Ethernet and video are consolidated onto a pair of optical fibers, cross-site cabling involves only the optical cable, and civil works and cabling costs decrease accordingly. The IDM OMP2400-4E1-30E combines the technical characteristics of PCM equipment and PDH transmission: telephones 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 service types each use their own channels on the same optical link.

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

A Single 1U Device Integrates 30 Telephone Channels, 4 Groups of E1 and 6 Isolated Ethernet Ports

The IDM OMP2400-4E1-30E consolidates subscriber interfaces that were originally spread across multiple devices into a single 1U chassis, allowing 30 telephone channels, 4 groups of E1 transparent transmission, HDMI high-definition video and 6 physically isolated Ethernet ports to operate online simultaneously. 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 require no additional conversion equipment when connected to SPC exchanges, analog trunks or magneto telephones. The 30 voice channels each occupy an independent channel within the device, so 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 the 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, so surveillance video and dispatch voice can be backhauled to the central equipment room together. Video and other services each use their own channels, and the equipment room no longer needs to lay a separate video cable for cameras.

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

How 2.5G Optical Port 1+1 Protection Keeps Telephone and E1 Services Uninterrupted When a Fiber Is Cut

2.5G optical port 1+1 protection configures 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 cut, optical module degradation or far-end anomaly, the device 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 require no renegotiation, and O&M personnel do not need to go on site to patch or replace 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 chain 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. This feature also enables the device, in the form of optical multiplexing equipment, to provide link redundancy assurance in government private network optical fiber communication solutions and military emergency communications vehicle solutions.

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 Partitioned 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 device, sharing neither bandwidth nor forwarding resources. The IDM OMP2400-4E1-30E provides 2 groups of line-rate 1000M and 4 groups of line-rate 100M Ethernet ports, with 2400M of physically isolated Ethernet in total and independent line rates for 2×1000M+4×100M; when one group is fully loaded, the other groups continue forwarding normally.

During deployment, services are assigned to different ports according to network security levels, following the principle that important services occupy dedicated ports. Typical 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 station end;

• 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 maintenance on one group of ports 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 and classified industries. For project selection that requires a product showcase of multi-service access capability, Raytrans, as an optical multiplexer manufacturer, can provide matching PCM equipment and optical multiplexing equipment configuration recommendations based on the actual interface requirements of government private network optical fiber communication solutions and military emergency communications vehicle solutions.

Core Technical Specifications

As a PCM equipment designed 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. The 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 an 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. What these sites have in common is the need to carry telephone, 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 networks 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 a single pair of fibers at the central side collects all services.

The telephone interfaces connect directly to dispatch voice equipment with ITU G.711 A-law and a loop current of 25mA per channel, and 4 groups of E1 transparent transmission free the opposite-end automation devices from configuration changes. With 2.5G optical port 1+1 protection enabled, any interruption of a section of inter-station optical cable automatically switches telephone and E1 services 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 telephone, 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.

The device supports dual power supply (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 an independent port without interfering with one another, and inspecting one port alone 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; relocation and redeployment require moving only one 1U device. In response to the actual requirements of government private network optical fiber communication solutions and military emergency communications vehicle solutions, the device can be flexibly embedded into existing optical fiber links and vehicle-mounted shelter environments.

Optical port 1+1 protection ensures that command and dispatch telephone services are not interrupted when a single 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 places less pressure on vehicle and shelter power supply.

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

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. Taking the Raytrans IDM OMP2400-4E1-30E as an example, the four checks proceed 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 a board.

2. Check the fiber conditions: confirm single-mode or multi-mode, whether the wavelength is 1310nm or 1550nm, and the link loss budget, and determine the distance grade of the SFP module based on the transmit optical power of -1~-3dBm and the receiver sensitivity better than -24dBm. As a professional optical multiplexer manufacturer, Raytrans can provide matching optical module selection recommendations.

3. Confirm the 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 in hot standby for each other; where only a single optical cable is available, at least reserve spare optical modules and spare parts.

4. Check the 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 a temperature-controlled cabinet is recommended.

Conclusion

As a PCM equipment for multi-service scenarios, 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; dual optical ports with automatic switchover on fiber break keep telephone and E1 services uninterrupted, and DC-48V/AC220V dual power supply with overall power consumption ≤100W makes it suitable for multi-service over a single fiber networking in electric power and energy, rail transit, and military and government private networks. As a typical application of an integrated service access device and optical multiplexing equipment, the product can leverage its multi-service over a single fiber carrying advantage in government private network optical fiber communication solutions and military emergency communications vehicle solutions; during selection, first count the telephone, E1, Ethernet and video channels, then calculate the link loss and check the power supply and environmental conditions; for a complete product showcase, networking solution and quotation, please contact the optical multiplexer manufacturer Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. (Raytrans, www.rdtcom.com, 010-51668966).