IDM OMP3500 Integrated Service Optical Fiber Transmission Equipment

IDM OMP3500 4-port 2.5G optical port integrated access platform is an integrated service optical fiber transmission equipment developed by Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. As one of the product showcases of Raytrans, a professional optical multiplexer manufacturer, the device is used at private network access points to carry up to 16 channels of E1 transparent transmission, up to 30 channels of narrowband PCM telephony and 6 groups of physically isolated Ethernet over a pair of 2.5G optical fibers. This 4-port 2.5G optical port integrated access platform provides 4 SFP 2.5G optical transmission interfaces and can form point-to-point, chain network, ring network or 1+1 protection networks, with self-healing private network links and transmission distances of 20KM, 40KM and 80KM; a single 19-inch 1U standard device can replace the stacking of multiple single-service devices, reducing equipment room space usage and cabling between devices, and is a common choice for access points of electric power and rail transit industrial private networks as well as military and government security private networks. As a typical multi-service optical multiplexer, it also provides the integrated access capabilities of a telephone optical multiplexer, a video optical multiplexer and a gigabit network optical multiplexer, and is widely applicable to scenarios such as government private network optical fiber communication solutions and military emergency communications vehicle solutions.

Key specifications at a glance: 4×2.5G optical ports · 16-channel E1 transparent transmission · 30-channel narrowband PCM · physically isolated Ethernet (2 groups of gigabit + 4 groups of Fast Ethernet) · 20/40/80KM transmission · dual power supply and wide temperature · 3 slots with hot swapping with power on

Figure 1: Overall appearance of the IDM OMP3500 integrated service optical fiber transmission equipment and its 3 service slots

What kind of device is a 4-port 2.5G optical port integrated access platform?

A 4-port 2.5G optical port integrated access platform is an integrated multiplexer that multiplexes three types of services—E1, Ethernet and narrowband PCM—onto a pair of 2.5G optical fibers for transmission. Model IDM OMP3500 is based on PDH, Ethernet and PCM technologies, and its technical performance complies with standards and recommendations such as ITU-T G.703 and IEEE 802.3. The 2.5G optical bandwidth simultaneously carries 2 groups of gigabit Ethernet, 4 groups of Fast Ethernet, up to 16 groups of transparent E1 and up to 30 channels of narrowband PCM; E1 is transmitted as-is by means of transparent transmission, and narrowband PCM services are accessed after time-slot non-blocking cross-connection between E1 and all subscriber interfaces. As a typical multi-service optical multiplexer, the platform integrates the core capabilities of a telephone optical multiplexer, a video optical multiplexer and a gigabit network optical multiplexer in one device, and can meet the stringent requirements for multi-service integrated access in government private network optical fiber communication solutions and military emergency communications vehicle solutions.

One device provides voice, leased-line data and Ethernet interfaces at the same time, so an access point does not need to configure multiple single-service devices separately by service type, and the deployment structure and variety of spare parts are simplified accordingly. IDM OMP3500 adopts a 19-inch 1U standard chassis, modular design and 3 service slots, and its boards support hot swapping with power on; it uses large-scale ASIC chip design with high integration; it supports multiple clock modes and can adapt to the clock requirements of different application environments. As a professional optical multiplexer manufacturer, Raytrans fully demonstrates in the product showcase of this platform the advantages of multi-service optical multiplexers in integration and reliability.

IDM OMP3500 can provide both DC-48V direct current and AC220V alternating current power supply, and can operate by connecting to the existing power supply system of an equipment room or an unattended site; its operating temperature is -20℃+50℃ and its relative humidity is 095% (non-condensing), making it suitable for long-term operation in equipment rooms without air conditioning.

Knowledge block: How multi-service over a single fiber is achieved over a pair of 2.5G optical fibers

Multi-service over a single fiber means that the 2.5G optical bandwidth is divided into multiple channels carrying different services, and the channels transmit independently without interfering with one another. IDM OMP3500 simultaneously carries 2 groups of physically isolated wire-speed gigabit Ethernet, 4 groups of physically isolated wire-speed 100M Ethernet, up to 16 groups of transparent E1 and up to 30 channels of narrowband PCM over a 2.5Gbps optical fiber; E1 is transmitted as-is by means of transparent transmission, and narrowband PCM services are accessed after time-slot non-blocking cross-connection between E1 and all subscriber interfaces. IDM OMP3500 provides 4 SFP 2.5G optical ports and can form point-to-point, chain network, ring network or 1+1 protection networks, and provides 2 groups of 2.5G optical fiber mutual backup, so that when one optical fiber fails, services are switched over to the other optical port.

Figure 2: IDM OMP3500 optical multiplexing principle block diagram, 2.5G optical path and division of service channels

How many services can a pair of 2.5G optical fibers carry? Core functions at a glance

The functions of IDM OMP3500 are divided into four categories: optical transmission, TDM access, Ethernet access, and network management and protection. See the table below for details of each item.

Among the 4 2.5G optical ports, 2 groups can be designated as mutual backup for optical path layer protection; PCM services can also be configured as mutual backup between an optical fiber and the PCM services on the first group of E1, further enhancing service reliability. Dual power supply and hot swapping with power on for boards allow both the power supply and service cards to be maintained as required, reducing site downtime. This multi-service optical multiplexer provided by Raytrans plays the dual role of a telephone optical multiplexer and a gigabit network optical multiplexer in its function showcase, and is suitable for incorporation into government private network optical fiber communication solutions and military emergency communications vehicle solutions.

How do 2 groups of gigabit and 4 groups of Fast Ethernet physically isolated Ethernet achieve non-interference between services?

Physically isolated wire-speed Ethernet means that each Ethernet port group is completely isolated at the data plane and does not share bandwidth with others, and each port group forwards independently at the interface wire speed. IDM OMP3500 provides 2 groups of gigabit + 4 groups of Fast Ethernet, 6 groups of physically isolated Ethernet in total, with standard protocol support for IEEE 802.3 and operating mode support for full/half duplex adaptive; when a traffic burst occurs on one network, it will not preempt the bandwidth of other networks, and services are securely isolated from one another. This design gives the multi-service optical multiplexer both the high-bandwidth carrying capacity of a gigabit network optical multiplexer and the security features of physical isolation.

Isolation is implemented at the hardware channel level and does not rely on VLAN configuration of a switch, making it suitable for access points that simultaneously carry multiple mutually independent security domains such as the office network, video surveillance network and production dispatching network. During deployment, services are assigned to different port groups according to security level: video surveillance uses one group of ports, the office network uses another group of ports, and dispatching data and production data each use one group of ports. The networks are physically isolated and invisible to one another, and it is also convenient to perform maintenance on one group of ports without affecting other services. In government private network optical fiber communication solutions, this isolation capability is particularly critical; while in military emergency communications vehicle solutions, the services of a video optical multiplexer and a gigabit network optical multiplexer can also be transmitted in parallel without interference through physically isolated port groups.

How are 16 channels of E1 transparent transmission and 30 channels of PCM accessed on the same device?

The E1 side is processed by transparent transmission as-is, and the PCM side is accessed by time-slot non-blocking cross-connection, with the two types of services each occupying an independent channel in the 2.5G optical bandwidth. IDM OMP3500 provides up to 16 groups of transparent E1, with physical interfaces of CC3-16 or CC3-8, a bit rate of 2.048Mbps, line coding HDB3, compliance with ITU-T G.703, selectable impedance of 75Ω/120Ω, and frame structure PCM30/31; time-slot non-blocking cross-connection is performed between E1 and all subscriber interfaces, facilitating interfacing with existing stored program control (SPC) switching and dispatching exchanges.

Narrowband PCM is the part of IDM OMP3500 intended for telephony and low-speed data access, providing various subscriber interfaces such as voice, data and image, with interface cards configured by capacity per card, as shown in the table below.

The 3 service slots of the IDM OMP3500 support mixed insertion of the above interface cards as well as video surveillance and video conferencing boards; the capacity of up to 30 channels of narrowband PCM and the interface card combination are determined by the site service list, and the specific configuration is subject to commercial confirmation. Service boards support hot swapping with power on, so capacity expansion or service card replacement does not affect the operation of other services on the unit. As an optical multiplexer manufacturer, Raytrans can, in its product showcase, flexibly configure different service board combinations such as telephone optical multiplexers and video optical multiplexers according to user requirements, providing a customized multi-service optical multiplexer access platform for government private network optical fiber communication solutions and military emergency communications vehicle solutions.

How are the 4 2.5G optical ports networked into a ring network with 1+1 protection, and how is the transmission distance configured?

The transmission distance is determined by the optical module selection. As a professional optical multiplexer manufacturer, Raytrans offers the IDM OMP3500 with three grades of single-mode SFP optical modules (multi-mode optional) at 20KM, 40KM and 80KM, with an optical rate of 2.5Gbps, wavelengths of 1310/1490/1550nm, transmit optical power of -1~-10dB, and receiver sensitivity better than -24dBm; applications of 40KM and above require SFP module selection based on the optical power budget, and link verification with an optical power meter during acceptance. As a multi-service optical multiplexer, this product fully takes into account the product showcase requirements of different scenarios in its transmission distance configuration.

The protection mode has two layers: the 4 2.5G optical ports can form a ring network or a 1+1 protection network, and when a single optical fiber fails, services are automatically switched to the protection channel for self-healing of private network link failures; on this basis, PCM services can also be configured for mutual backup between the optical fiber and the PCM services on E1 group 1, forming dual protection at the optical path layer and the service layer. This optical multiplexer product performs particularly well in government private network optical fiber communication solutions.

In terms of networking topology, the IDM OMP3500 can form point-to-point, chain network, ring network or 1+1 protection networks. In point-to-point mode, one device is deployed at each end of the link, directly connected over a pair of 2.5G optical fibers; in chain network mode, sites along the line are connected in series level by level, which suits strip-distributed scenarios such as highways and railways; in centralized point-to-multipoint mode, one centralized IDM-OMP device can connect up to 9 IDM OMP3500 devices, simplifying the configuration and management of the central equipment room.

Figure 3: Networking diagram of the IDM OMP3500 in point-to-point and chain network application modes

The central equipment room can also aggregate remote services onto the existing transmission plane: E1 services are aggregated to the E1 access card for termination, telephone services are aggregated to the switching card, and connected to the upper-level SPC exchange through digital trunks via SS7, C7 or PRI; the SNMP Ethernet network management incorporates site devices into the existing network management system for unified management. In hybrid networking scenarios, the IDM OMP3500 can also coexist on the same network with broadband fiber access devices such as the IDM G3CP, and each site selects the corresponding access device according to its service volume. As a converged platform for video optical multiplexers and telephone optical multiplexers, this device also offers excellent networking flexibility in military emergency communications vehicle solutions.

Figure 4: IDM OMP3500 centralized point-to-multipoint application mode, with the central device connecting 9 remote devices

Figure 5: Diagram of hybrid networking between the IDM OMP3500 and broadband fiber access devices

IDM OMP3500 Technical Specifications

The technical specifications of the IDM OMP3500 are divided into optical interfaces, E1 interfaces, Ethernet and narrowband service interfaces, power supply and environment, and other sections. The electrical characteristics of the interfaces comply with ITU-T, IEEE and other standard recommendations.

The Ethernet and narrowband service interface parameters are shown in the table below.

The power supply and operating environment parameters are shown in the table below.

Differentiated Value

The differentiated capabilities of the IDM OMP3500, combined with the actual requirements of private network access points, are reflected in the following three points, as detailed in the table below.

Typical Application Scenarios

Electric power and rail transit industrial private networks: access at substations, distribution stations and stations along the line

Substations and distribution stations simultaneously have three types of services: dispatch telephone, telecontrol data and video surveillance, while access points at stations along a rail transit line are more distributed and spaced further apart. The IDM OMP3500 carries the three types of services out at once over a pair of 2.5G optical fibers: E1 transparent transmission carries the telecontrol and protection information channels, RS232/RS422/RS485 interface cards connect serial port telecontrol and monitoring data, FXS/FXO cards connect dispatch telephones and hotlines, and 6 physically isolated Ethernet groups carry the video surveillance network, office network and production network respectively. The ring network or 1+1 protection, together with optical fiber and E1 mutual backup, improves the line availability of the dispatch data network; the -20℃~+50℃ operating temperature and dual power supply suit the operating conditions of unattended sites such as distribution rooms and switching stations.

Figure 6: Deployment diagram of multi-service over a single fiber access at electric power and rail transit sites for the IDM OMP3500

Military and government security private networks: access at training sites, emergency command posts and classified equipment rooms

Field equipment in military and government security private networks is mainly magneto telephones, serial port telecontrol and video surveillance, with relatively harsh power supply and environmental conditions and higher requirements for network segmentation. The IDM OMP3500 uses magneto cards, serial port cards and 6 physically isolated Ethernet groups to complete field access; networks of different security domains each occupy an independent channel, with isolation completed at the hardware level. The dual power supply and wide-temperature design suit equipment rooms without air conditioning, long-distance optical modules of 40 KM and above cover the spacing between field sites, and a ring network or 1+1 protection network can be formed to improve link survivability. SNMP network management allows O&M personnel to remotely monitor site device status over the existing IP network, reducing field duty and inspection frequency. Raytrans provides a complete product combination of multi-service optical multiplexers and gigabit network optical multiplexers for military emergency communications vehicle solutions and government private network optical fiber communication solutions, meeting the access requirements of various security private networks.

Unattended field sites in oilfields and mining areas: wide temperature operation and remote network management

Oilfield well sites, mining area pitheads and field pumping stations are distributed sites with no permanent staff, and power supply and inspection conditions are limited. The IDM OMP3500 is installed in the site cabinet in a 19-inch 1U chassis, collecting on-site voice channels, serial port data and monitoring Ethernet into a pair of 2.5G optical fibers; when site services change, only the service boards need to be replaced. The DC-48V and AC220V dual power supply can be directly connected to the existing power supply in the cabinet, and the wide operating temperature range adapts to equipment rooms without air conditioning. After multiple sites are connected in series into a chain network or form a ring network, the device status of any site can be viewed in the central equipment room through SNMP network management, reducing on-site inspection frequency.

Conclusion

The IDM OMP3500 4-port 2.5G optical port integrated access platform integrates up to 16-channel E1 transparent transmission, up to 30-channel narrowband PCM and 6 physically isolated Ethernet groups over a pair of 2.5G optical fibers. With 4 optical port ring network or 1+1 protection, 20/40/80 KM transmission and optical fiber and E1 mutual backup, it is a common choice for multi-service over a single fiber at access points of electric power and rail transit industrial private networks and military and government security private networks. As a representative product of a professional optical multiplexer manufacturer, this multi-service optical multiplexer from Raytrans also provides the integrated access capabilities of a telephone optical multiplexer, a gigabit network optical multiplexer and a video optical multiplexer, and can be widely used in government private network optical fiber communication solutions and military emergency communications vehicle solutions. For the complete product showcase, networking solutions for the 4-port 2.5G optical port integrated access platform and selection and quotation, please contact the sales department of Beijing Ruiguang Jiyuan Digital Technology Co., Ltd.