Ethernet E1/G.703 Bridge



Ethernet over E1/G.703 bridge for standalone or rack mounted use.

  • Connects one Fast Ethernet over E1 links (2.048Mbps)
  • 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).
  • Supports auto-negotiation and auto MDI/MDIX
  • Standalone RS232 console management via CH01M
  • Web/SNMP management via FRM220 20 slot chassis


The FRM220A-EoE1 is a single E1 Ethernet bridge card capable of carrying 10/100BaseTX or 100Base-FX LANs over single E1 transports. The FRM220A-EoE1 transmits up to a 1.8Mbps Ethernet bridge channel (HDLC encapsulated) over 1 E1 link. The FRM220A-EoE1 supports an E1 attenuation of up to 43 dB on twisted pair or coax cable. This 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.

Ethernet over E1/G.703

Management Features

The FRM220-Eoe1/G has an on-board 2 pole DIP Switch which can be used to configure the device timing source (recovery or internal) and the framing mode. When placed in a stand-alone chassis with DB9 console port (see below), these devices support a text based serial terminal with an easy to use menu system for configuration. When placed in a managed chassis, the card is configured and monitored through the chassis NMC (network management controller) via console, Telnet, Web HTTP or SNMP 


Item Description
E1 Interface

Framing Unframed
Standard ITU-T G.703/G.704/G.706 & G.732, G.823
Bit rate 2.048Mbps± 50ppm
Line code HDB3
Clock setting Internal OSC or recovery clock
Receive level -43dB
Line impedance 75 ohm (BNC) / 120 ohm (RJ-45)
Jitter Performance Complies with ITU-T G.823
Pulse Mask Complies with ITU-T G.703
Pulse amplitude Nominal 2.37V ± 10%
Delay Variance 220ms
Connector RJ-45, BNC

Ethernet Interface

Diagnostics Digital remote loopback
Standards IEEE 802.3, 802.3u
Data rate 10/100Base-TX or 100Base-FX Half/Full
duplex. Encapsulation GFP (G.7041)
MTU 2046bytes


RJ45 10/100Base-T
SFP-LC 100Base-FX


Power, ALM,E1 signal loss ,E1 Alarm (AIS, LOF, RAI, LOMF),
LAN link /ACT, 10/100M , SD (100Base-FX)

Power Input


Power Consumption

< 6W


155 x 88 x 24 mm (D x W x H)


DC12 : 280g AC/DC 48/AD : 580g


0 ~ 50°C (Operating), -10 ~ 70°C (Storage)


10 ~ 90% RH (non-condensing)


CE, FCC, RoHS compliant


65,000 hrs

Ordering Information

Order Code Description
CT-FRM220A-EOE1/G 10/100Base-TX to E1 GFP bridge operates at WAN
CT-FRM220A-EOE1/GS 100Base-FX SFP to E1 GFP bridge operates at WAN (Optical SFP module)

More Information

Chassis and mounting options for the FRM220 family.

AC and DC power options available.  See individual products for further details.

1 Slot standalone chassis for ISDN, voice or data modules, AC or DC
1 Slot chassis with DB9 console port for Ethernet, voice or serial cards
2 Slot Ethernet, ISDN and serial chassis with console port
2 Slot chassis manageable via NMC card
4 slot Ethernet, ISDN and serial chassis, 1U
8 Slot multi service rack, 1U
20 Slot multi function chassis with Ethernet, serial and ISDN, 2u
20 Slot Ethernet aggregation rack, 2u