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E1 Ethernet Bridge

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FRM220A-Eoe1 - Ethernet over E1

E1 Ethernet Bridge

The FRM220A-Eoe1 is an Ethernet over E1 bridge and is part of the FRM220 family of interface converters and fibre optic line drivers. The FRM220A-Eoe-1, when used in pairs, enables users to connect 2 Ethernet networks together over an E1/G.703 link. The LAN interface on the unit is presented as a single 10/100BaseTX RJ45 connector and the E1/G.703 interface is presented as either a pair of 75 ohm BNC connectors or a 120 ohm RJ45 connector. The FRM220A-Eoe-1 has the capability to be connected to both unframed 2.048Mbps E1 interfaces as well as fractional n x 64Kbps E1 services.

Configuration can either be locally done via on-board DIP switches, or if remote management is required the FRM220A-Eoe-1 can located within a managed chassis to allow remote Web, Telnet and SNMP management. When utilised in a managed environment the remote FRM220A-Eoe-1 can be managed over the E1 link by using the 'spare bits' in Timeslot 0 (fractional operation only). The FRM220A-Eoe1 also features integral test capabilities to aid in any troubleshooting process. This includes an in-built Bit Error Rate Tester and the ability to place various software loops within the system. This enables engineers at either end of the line to test both the FRM220A-Eoe1's and the connected E1 line. The Ethernet interface supports auto-negotiation and auto MDI/MDIX, allowing plug-and-play connections without any additional configuration. Alternatively the Ethernet interface can have its speed and duplex hardset if necessary.

E1 Ethernet Bridge


  • 1 x 10/100BaseTX Ethernet Interface
  • Simple Configuration
  • Auto-Negotiation or Hard Setting of Ethernet Speed and Duplex
  • Unbalanced 75 ohm BNC's or balanced 120 ohm RJ45
  • Fully compatible with FRM220 chassis
  • Options for Web, Telnet and SNMP management
  • Wide range of LED's for diagnostics



Framing: Unframed or CCS+CRC
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 (RJ45)
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: RJ45, BNC
Diagnostics: Digital remote loopback
Standard: IEEE 802.3, 802.3u
Data rate: 10/100Base-TX, Half/Full duplex
Connector: RJ45 10/100Base-TX

Indications: Power, ALM, E1 signal loss, E1 Alarm, AIS, LOF, RAI, LOMF, LAN link/ACT, 10/100M
Power Input: AC adapter : 100~240VAC to 12VDC, AC 100 ~ 240V, DC -18 ~ 75V
Power Consumption: < 12W
Dimensions: DC12 : 160 x 88 x 24mm (D x W x H), AC/DC48/AD : 201 x 135 x 35mm (D x W x H)
Weight: DC 12 : 280g, AC/DC48/AD : 580g
Temperature: 0 ~ 60°C (Operating), -10 ~ 70°C (Storage)
Humidity: 10 ~ 90% RH (non-condensing)
Certifications: CE, FCC, RoHS
MTBF: 65,000 hrs (25°C)