8xE1/T1+ GbE Fibre Multiplexer

8xE1/T1+ GbE Fibre Multiplexer

The FRM220-GFOM08 is a 8 channel E1/T1 fibre multiplexer with an additional Gigabit Ethernet trunk, plus order wire and clear channel RS-232, constructed as a two slot wide card for the FRM220 series. When the FRM220-GFOM08 card is placed in the FRM220 rack with NMC, the management can view the converter card's status, type, version, fibre link status and alarms. The card can be configured to enable or disable the port, reset the port, and provide local or remote diagnostic loopback. The 1+1 redundant optical aggregate of this multiplexer employs industry standard pluggable optics (SFP) operating at 1.25Mbps data rates. The SFP modules can be chosen to support single-mode, multimode, single fibre bi-directional or Coarse and Dense Wave Division Multiplexing (CWDM).

8xE1/T1+ GbE Fibre Multiplexer schematic


  • 8 channels unframed E1/T1 (transparent)
  • 10/100/1000Base-T Ethernet
  • Auto MDI/MDIX & Auto-Negotiation or Force Mode
  • Supports flow control 802.3x & 9K jumbo packets
  • Supports link fault Pass-Through for Ethernet
  • One clear channel RS232 up to 250Kbps(Async)
  • 1+1 fibre protection, less than 50ms
  • Supports Digital Diagnostics Monitoring Interface (DDMI) SFP
  • AIS on signal loss on E1/T1 and fibre port
  • Loopback test on E1/T1, RS232, fibre ports
  • 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 & Dying Gasp


E1/T1 ports:

  • Framing: Unframed (transparent)
  • Bit Rate: E1:2.048 Mb/s , T1: 1.544Mb/s
  • Line Code: E1:AMI/HDB3, T1: AMI/B8ZS
  • Line Impedance:
    • E1: Unbalanced 75 ohms (BNC)
    • E1: Balanced 120 ohms (RJ-45)
    • T1: Balanced 100 ohms (RJ-45)
  • Receiver sensitivity: Short haul
  • “Pulse" Amplitude: Nominal 2.37V+/-10% for 75 ohms; Nominal 3.00V+/-10% for 120 ohms
  • “Zero" Amplitude: +/-0.3V
  • Internal Timing: +/-30 ppm
  • Jitter Performance: According to ITU-T G.823
  • Performance Monitoring: According to ITU-T G.821
  • Standards: ITU-T G.703, G.704, G.706 and G.732
  • Interface Connectors: RJ-45

E1/T1 ports:

  • Test Loops
    • LLB (Local Loop Back)
    • NELB (Near End Loop Back)
    • RLB (Remote Loop Back)
    • RRLB (Request Remote Loop Back)


  • Connector: SFP LC
  • Data Rate: 1.25 Gbps


  • Interface Type: 10/100/1000Base-T
  • Connector: RJ-45
  • Standards: IEEE 802.3, 802.3u, 802.3ab
  • Duplex modes: full/half

Indications: FX1 Link, FX2 link, E1/T1 Mode/Link/Loopback test, Order wire phone indicator, LAN Link/Speed.
Power Input: 12VDC
Dimensions: 140 x 88 x 42mm (D x W x H)
Weight: 200g
Temperature: 0 ~ 50°C (Operating), -10 ~ 70°C (Storage)
Humidity: 10 ~ 90% RH (non-condensing)
Certifications: CE, FCC, RoHS compliant

Rear Panel view:

FRM220-GFOM08 rear panel

Live Demo of FRM220 Chassis

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