Ethernet Bridge over E1

  • HDLC
  • MTU 1522bytes
  • Framed / Unframed E1


The FRM220A-Eoe1 is an Ethernet over E1 Bridge for cost-effective connection of 10/100Base-TX or 100Base-FX LANs
over a single E1 transport. By using standard HDLC encapsulation, the FRM220A-Eoe1 is able to transmit up to a 2M bits
Ethernet over an E1 link. The FRM220A-Eoe1 supports an E1 attenuation of up to 43 dB on twisted pair or coax cable,
which provides an approximate operating range up to 2km (using 22AWG). The FRM220A-Eoe1 fully meets E1
specifications including ITU-T G.703 and G.823. The FRM220A-Eoe1 features diagnostic capabilities for performing
remote loopback. The operator at either end of the line may test both the FRM220A-Eoe1 and the line in the digital
loopback mode. The Ethernet copper interface supports auto-negotiation and auto MDI/MDIX, allowing plug-and-play
Ethernet connection without any additional configuration. When placed in FRM220A system, the Ethernet may be
aggregated to the chassis’s built in Ethernet switch. When placed in a single slot chassis and used standalone without
management, the card may be configured by DIP switch.


  • Connects one Fast Ethernet over E1 links (64k~2048Kbps)
  • Built-in HDLC bridge operates at WAN rate
  • Auto-Negotiation
  • Unbalanced E1/BNC or balanced E1/RJ45
  • Fully compatible with FRM220A and FRM220 chassis
  • SNMP management with FRM220A and FRM220 chassis
  • LED Alarm indication
  • Standalone RS232 console management via CH01M
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