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FRM220-FOM04 is a modular design for 4xE1/T1 + Fast Ethernet multi-service to dual strand fiber PDH multiplexer. FRM220-FOM04 provides E1/T1 transmission transparently, pure 100Mbps Fast Ethernet simultaneously. The fiber optic line is based on the SFP technology that allows a flexible use of Multimode or Single mode lines and enable the support of different wavelengths and distances. The use of bi-directional SFPs maximizes the utilization of the fiber optic line and results in saving line costs. With SNMP and Web-based management in the FRM220, the Network administrator can monitor, configure and control the activity of each card in the chassis.

Data Sheet


  • 4 channels unframed E1/T1
  • 10/100Base-TX Ethernet (100M wirespeed)
  • Auto MDI/MDIX
  • Auto-Negotiation or Force mode
  • Supports flow control 802.3x
  • Supports 9K jumbo packets
  • Supports Link fault pass through for Ethernet
  • One clear channel RS232 up to 250Kbps(Async)
  • 1+1 fiber protection, less than 50ms
  • Supports Digital Diagnostics Monitoring Interface (DDMI) SFP
  • AIS on signal loss on E1/T1 and fiber port
  • Loopback test on E1/T1, RS232, fiber ports
  • Supports Dying Gasp
  • Supports local or remote In-band management (Monitor or Configure status) by SNMP manager and console port.
  • Supports Order wire Ear / Microphone port.
  • Supports On-Line F/W upgrade.

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