iMux8 Inverse Multiplexer

iMux8 Inverse Multiplexer

The FRM220A-iMux8 is an E1 inverse multiplexer capable of bundling up to 8 E1 lines for cost-effective connection of 10/100BaseTX or 100Base-FX LANs over multiple E1 transports. The FRM220A-iMux8 inverse multiplexer transmits up to a 15.87Mbps Ethernet bridge channel (GFP-F encapsulated) over 8 E1 links. The FRM220A-iMux8 bridges the gap between E1 and E3, allowing bridges to operate at faster rates. It also provides high speed access to SDH/SONET backbones where the only access services available are E1 lines. The FRM220A-iMux8 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-iMux8 fully meets E1 specifications including ITU-T G.703 and G.823. The FRM220A-iMux8 features diagnostic capabilities for performing remote loopback. The operator at either end of the line may test both the FRM220A-iMux8 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.

iMux8 Inverse Multiplexer diagram


  • Connects one Fast Ethernet over 8E1 links (1.984Mbps to 15.87Mbps)
  • Built-in GFP bridge operates at WAN rate
  • Auto-Negotiation
  • Maximum 220ms delay variance between E1 link
  • Unbalanced E1/BNC or balanced E1/RJ45
  • Fully compatible with FRM220A chassis
  • SNMP management with FRM220A chassis
  • LED Alarm indication



  • Framing: CCS+CRC
  • Standard: ITU-T G.703/G.704/G.706 & G.732, G.823
  • Bit rate: 2.048Mbps± 50ppm (up to 8E1)
  • 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, 100Base-FX
  • Connector: RJ45 10/100Base-TX, SFP-LC 100Base-FX


Indications: Power, ALM, E1 signal loss, E1 Alarm, (AIS, LOF RAI, LOMF), LAN link /ACT, 10/100M , SD(100Base-FX)
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 ~ 50°C (Operating), -10 ~ 70°C (Storage)
Humidity: 10 ~ 90% RH (non-condensing)
Certifications: CE, FCC, RoHS
MTBF: 65,000 hrs (25°C)