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Home Products Multiplexers E1 Inverse iMux8 E1 Inverse Multiplexer

iMux8 E1 Inverse Multiplexer

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FRM220A-iMux8 Inverse Multiplexer

8E1 Inverse Multiplexer

The FRM220A-iMux8 is a slide-in card 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 E1/ET100 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.

iMux 8 Inverser Multiplexer diagram


  • Connects one Fast Ethernet over 8E1 links (1.984Mbps to 15.87Mbps)
  • Built-in HDLC 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-CH20 chassis
  • SNMP management with FRM220A-CH20 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)