IDM-3500 Integrated Service Transmission Equipment

IDM OMP3500 PCM Integrated Access Platform (Model IDM OMP3500, abbreviated as IDM-3500, officially known as IDM OMP3500 Integrated Service Access Platform) is a 2.5G integrated multiplexer developed by Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. As a PDH product showcase solution for private network access scenarios, it is used at private network access points to carry 30 channels of narrowband PCM telephony, 16 groups of transparent E1, and 6 groups of physically isolated Ethernet over a pair of 2.5Gbps optical fibers. The IDM OMP3500 PCM Integrated Access Platform puts telephony, leased-line data, and Ethernet access into a single device, replacing the stacking of multiple single-service devices with one device, reducing equipment room space usage and cabling between devices. It is a common choice for multi-service over a single fiber at private network access points in electric power, transportation, mining, public security, and industrial park sectors, and is also a representative PCM equipment offered by Raytrans as an optical multiplexer manufacturer.

Key specifications at a glance: 30-channel narrowband PCM · 16 groups of transparent E1 · 6 groups of physically isolated Ethernet (2 gigabit + 4 Fast Ethernet) · dual 2.5G optical port mutual backup · 20/40/80km single-mode selectable · DC-48V/AC220V dual power supply

Figure 1: IDM OMP3500 PCM Integrated Access Platform — front view of the unit and close-up of 3 service slots

What kind of device is a PCM integrated access platform?

A PCM integrated access platform is an integrated multiplexer that multiplexes E1, Ethernet, and narrowband PCM services onto a pair of 2.5Gbps optical fibers for transmission, and is one of the representative products Raytrans offers for multi-service access scenarios. Taking the IDM OMP3500 as an example, the 2.5G optical bandwidth simultaneously carries 2 groups of gigabit Ethernet, 4 groups of Fast Ethernet, 16 groups of transparent E1, and 30×64K narrowband PCM services; the 16 groups of E1 are transmitted as-is via transparent transmission, and the narrowband PCM services are accessed after time-slot non-blocking cross-connection between 2 groups of E1 and all subscriber interfaces. One device simultaneously provides voice, leased-line data, and Ethernet interfaces, so an access point no longer needs to configure multiple single-service devices separately by service type, effectively simplifying the product showcase and deployment structure.

The IDM OMP3500 PCM Integrated Access Platform uses a 19-inch standard chassis with 3 service slots, and the boards support hot swapping with power on, so when site service types change, adjustments can be made simply by replacing boards; it supports multiple clock modes to adapt to the clock requirements of different application environments. Power supply can simultaneously provide ~220V AC and -48V DC, and it can operate by connecting to the existing power supply system of an equipment room or unattended site.

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

Multi-service over a single fiber means the 2.5G optical bandwidth is divided into multiple channels carrying different services, with the channels transmitting independently without interfering with one another. The IDM OMP3500 simultaneously carries 2 groups of gigabit Ethernet, 4 groups of Fast Ethernet, 16 groups of transparent E1, and 30×64K narrowband PCM over a 2.5Gbps optical fiber; the 16 groups of E1 are transmitted as-is via transparent transmission, and the narrowband PCM services are accessed after time-slot non-blocking cross-connection between 2 groups of E1 and all subscriber interfaces. The 2 groups of 2.5G optical ports (Fiber A / Fiber B) provide mutual backup; when one optical fiber fails, services switch over to the other optical port, and point-to-point, chain network, ring network, or 1+1 protection networks can be formed.

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

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

What interface cards does the 30-channel narrowband PCM support?

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

The 3 service slots of the IDM OMP3500 PCM Integrated Access Platform can be mixed with FXS/FXO, magneto, 2/4-wire EM, RS232/RS422/RS485, GSM/CDMA, and USER universal interface cards, as well as video surveillance and video conferencing boards; the capacity of the 30-channel narrowband PCM and the combination of interface cards are determined according to the site service list, and the specific configuration is subject to commercial confirmation.

Figure 2: IDM OMP3500 PCM Integrated Access Platform — front panel indicator LEDs, service slots, and optical fiber interface panel

How are 6 groups of physically isolated Ethernet and 16 groups of E1 connected to the same device?

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. The IDM OMP3500 PCM integrated access platform provides 6 groups of physically isolated Ethernet, comprising 2 groups of gigabit and 4 groups of fast Ethernet. It suits access points that simultaneously carry multiple independent networks such as the office network, video surveillance network and production network. The standard protocol supports IEEE 802.3, and the operating mode supports full/half duplex adaptive. A traffic burst on one network will not squeeze the bandwidth of the others.

The E1 side is transmitted as-is. The 16 groups of E1 on the IDM OMP3500 PCM integrated access platform are transmitted in transparent transmission mode, with a physical interface of CC3-16 or CC3-8, a bit rate of 2.048Mbps and line coding of HDB3, compliant with ITU-T G.703. Time-slot non-blocking cross-connection is performed between the 2 groups of E1 and all subscriber interfaces, and multiple clock modes are supported, facilitating interfacing with existing SPC exchanges, dispatching exchanges and other equipment. Service boards are inserted into the 3 service slots and support hot swapping with power on, so capacity expansion or service card replacement does not affect the operation of other services on the unit.

Figure 3: IDM OMP3500 PCM Integrated Access Platform Narrowband PCM Board (Telephone, Magneto, EM, Serial Port)

How to Configure Dual 2.5G Optical Port Mutual Backup and 80 km Single-Mode Transmission?

Transmission distance is determined by the optical module selection. As a PDH product showcase solution for private network access, the IDM OMP3500 PCM integrated access platform supports 20km, 40km and 80km single-mode SFP optical modules (multi-mode optional), with an optical rate of 2.5Gbps, a wavelength of 1310/1490/1550nm, a transmit optical power of -1~-10dB and a receiver sensitivity better than -24dBm. Applications of 40km and above require selecting SFP modules according to the optical power budget, and verifying the link with an optical power meter during acceptance. The platform integrates the capabilities of PCM equipment, integrated service access device, optical transmission equipment and optical multiplexing equipment, and can meet the requirements of various scenarios such as government private network optical fiber communication solutions and smart mining communication solutions.

The protection mode has two layers: 2 groups of 2.5G optical fibers mutual backup (Fiber A / Fiber B) provide optical path layer protection, and when one fiber fails, services are automatically switched to the other optical port; on this basis, mutual backup between the optical fiber and the PCM services on 1 of the E1 groups can also be configured, forming dual protection. The IDM OMP3500 can form point-to-point, chain network, ring network or 1+1 protection networks: a point-to-point application deploys one device at each end, directly connected through 2.5G SFP optical ports, and a single end can simultaneously provide service combinations such as GE×2, FE×4, E1×8 and voice channel×8; a centralized point-to-multipoint application deploys one centralized aggregation equipment in the central equipment room and can connect several remote devices, suiting centralized aggregation of services from multiple remote stations. The E1 services of remote stations can be aggregated to the E1 access card for local termination, and telephone services are aggregated to the switching card, connecting to the upper-level SPC exchange through digital trunks with SS7, C7 or PRI; SNMP Ethernet network management can incorporate site devices into the existing network management system for unified management. As a professional optical multiplexer manufacturer, Raytrans incorporates time-slot cross-connect equipment technology into this platform to achieve efficient cross-connection scheduling of E1 and voice channel services.

Figure 4: IDM OMP3500 PCM Integrated Access Platform Dual 2.5G SFP Optical Ports and Rear Panel Power Supply Terminals

IDM OMP3500 Technical Specifications

The technical specifications of the IDM OMP3500 PCM integrated access platform are shown in the table below. The parameters are subject to the product documentation, and the specific configuration is subject to commercial confirmation.

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

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

Differentiated Value

The differentiated capabilities of the IDM OMP3500 PCM integrated access platform, 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 Private Network: Access at Substations, Distribution Stations and Switching Stations

Substations and distribution stations simultaneously have three types of services: dispatch telephone, telecontrol data and video surveillance. The IDM OMP3500 PCM integrated access platform carries all three types of services out at once over a pair of 2.5G fibers: 16 groups of transparent transmission E1 carry 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 groups of physically isolated Ethernet separately carry the video surveillance network, office network and production network, with no bandwidth preemption between the networks. The operating temperature of -20℃~+50℃ and DC-48V/AC220V dual power supply suit the operating conditions of unattended sites such as distribution rooms and switching stations.

Transportation Private Network: Sites along Expressways and Rail Transit

Access points along expressways and rail transit are distributed along the line with large spacing, and the service types and quantities at toll stations, service areas, traction substations and stations vary. The IDM OMP3500 PCM integrated access platform provides three grades of single-mode optical modules: 20km/40km/80km, which can be selected according to station spacing; it can form chain networks, ring networks or 1+1 protection networks, and together with dual 2.5G optical port mutual backup, reduces the impact of single point of interruption on services along the line. Voice dispatching, surveillance video and leased-line data at sites along the line are terminated within the same device, and equipment room space and the number of devices are reduced accordingly.

Mining and Unattended Industrial Sites

The field devices at mining and industrial sites are mainly magneto telephones, serial port telecontrol and video surveillance, and the power supply and environmental conditions are relatively harsh. The IDM OMP3500 PCM integrated access platform uses magneto cards, serial port cards and isolated Ethernet for field access; the dual power supply and wide-temperature design suit equipment rooms without air conditioning, and SNMP network management makes it easy for O&M personnel to remotely monitor device status at sites from the central equipment room, reducing on-site duty and inspection frequency. This solution has been deployed in multiple smart mining communication solutions. With its deep technical accumulation as an optical multiplexer manufacturer, Raytrans provides stable and reliable integrated service access devices and optical multiplexing equipment support for mining scenarios.

Figure 5: IDM OMP3500 PCM integrated access platform — cabinet installation and deployment at sites along the line and multi-service over a single fiber networking diagram

Conclusion

The IDM OMP3500 PCM integrated access platform integrates 30 channels of narrowband PCM, 16 groups of transparent transmission E1 and 2 gigabit + 4 fast Ethernet physically isolated Ethernet over a pair of 2.5G fibers. Together with dual 2.5G optical port mutual backup and 20/40/80km single-mode selection, it is a reliable choice for multi-service over a single fiber at private network access points in electric power, transportation, mining, public security and industrial parks. As a professional optical multiplexer manufacturer, Raytrans's PDH, PCM equipment, integrated service access devices, optical transmission equipment, optical multiplexing equipment and time-slot cross-connect equipment are widely used in government private network optical fiber communication solutions and smart mining communication solutions. For a complete PCM integrated access platform networking solution and selection and quotation, contact Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. (www.rdtcom.com, tel: 010-51668966) for business inquiries.