FRM220-E1/T1 Fibre Optic Modem

FRM220-E1/T1 Fibre Optic Modem

The FRM220-E1/T1 is a fibre media transport for G.703 E1/T1 transmissions. The BNC model provides unbalanced 75 Ohm coaxial E1 connections while the RJ-45 model provides switchable balanced 120 Ohm E1 or 100 Ohm T1 connections over twisted pair wiring. When the FRM220-E1/T1 card is placed in the FRM220 rack with in-band management, the card status, type, version, fibre link status, E1 or T1 link status and alarms for both local card and remote unit can all be displayed. Configuration is also available to enable or disable the port, reset the port, do far end fault setting, and initiate local or far end loop-back tests. When set for E1 mode, the FRM220-E1/T1 also supports fractional (structured) E1 when connected to a remote FRM220-Data, synchronous data communications converter. In an E1 transmission network where end connection requires synchronous data communication such as V.35 or RS-530 (X.21, RS-449), these units eliminate the need for an extra CSU/DSU. When placed in a single slot chassis and used standalone without management, the card may be configured by DIP switches.

Managed Gigabit Ethernet Converter schematic


  • T1/E1 RJ-45 (USOC RJ-48C) or E1 Coax (BNC) to Fibre converter
  • Local on-board DIP switch configuration
  • In-band network management via terminal, web or SNMP (via NMC management card)
  • Supports AMI or B8ZS/HDB3 line codes
  • T1 supports unframed to FRM220-DATA
  • E1 supports unframed or fractional (n x 64Kbps) to FRM220-DATA
  • User selectable E1 or T1 operation
  • Electrical and optical Loop back tests


Optical Interface:

  • Connector: 1x9 (SC, ST, FC) or SFP LC
  • Distance: MM 2km, SM 15/30/50/80/120km, WDM 20/40/60/80km
  • Wavelength: MM 1310nm, SM 1310, 1550nm, WDM 1310Tx/1550Rx(type A), 1550Tx/1310Rx(type B)

Electrical Interface:

  • Connector: RJ45 E1-120Ω, T1-100 Ω, BNC E1-75 Ω
  • Data rate: E1: 2.048Mpbs, T1:1.544Mbps
  • Line Code: E1 HDB3/AMI, T1: B8ZS/AMI
  • Cable type:Cat.3 or higher Twisted-Pair cable

Standard: E1 ITU-T G.703, G.704, G.706, G.732, G.823, T1 ITU-T G.703, G.704, AT&T, TR-62411, ANSI T1.403
Indications: Power, FX-Link, E1/T1 SIG, Test, SYN, RD, TD, AIS, (E1/T1R) Power, FX-Link, E1 SIG, Test(E1B)
Power Input: Card : 12VDC, Standalone : AC, DC options
Power Consumption: < 5W
Dimensions: 155 x 88 x 23mm (D x W x H)
Weight: 120g
Temperature: 0 ~ 50°C (Operating), -10 ~ 70°C (Storage)
Humidity: 10~90% non-condensing
Certification: CE, FCC, LVD, RoHS
MTBF: 65,000 hrs (25°C)

NB: Alternative product to the Probot 3005

Live Demo of FRM220 Chassis

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