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Fiber Optic Modem FMUX/M-E1

Optical Transceiver Parameters

FMUX/M-E1 Features
  • Transmission of E1 channel via fiber optic link
  • Single mode or multimode fiber
  • Single fiber option (for point-to-point operation only)
  • Distance up to 150 km
  • Ring architecture support with transmission up to 44 E1 channels (for two fibers models only)
  • Remote link loopback (for point-to-point operation only)
  • Integrated BER tester
  • Console RS-232 port
  • Remote management
  • Optional Ethernet 10Base-T port for SNMP-based management
  • DC power
  • External AC power adapter (ordered separately)
  • 1U high frame for mounting two units into 19-inch rack (ordered separately)
  • Certificate N OS-6-SP-1998

FMUX/M-E1 is a modem for transmission of a E1 channel (2048 kbps, compliance with ITU-T G.703 and G.704 Recommendations) over a fiber optic link. Unframed (transparent) mode of operation is also available.

FMUX/M-E1 is optically compatible with multiplexers of Cronyx FMUX family, so these devices may be used together in ring mode of operation.

Device has metal Mini box enclosure.

FMUX has LEDs for indication of state of the device, state of fiber optic link transceivers, state of E1 port and of test mode.

Simple configuration of the device (limited to timeslot assignment for the E1 channel transmission) is set by DIP switches located on front panel of the device.

Both detailed configuration and full monitoring of the device's operation are available from the console (ASCII terminal attached to the device by RS-232 interface). Optional SNMP-based management is also available.

Internal loopbacks and embedded BER tester operation are controllable from console.

BER tester meters bit error rate in optic link using permanent or pseudo random code in compliance with the ITU-T O.151 Recommendation (test sequence length equals to 223-1=8388607 bits).

Remote device management is available by remote login feature. Service data exchange is supported by additional service channel using same optic link (available in point-to-point configuration only).

FMUX/M-E1 has metal Mini enclosure, and may be ordered with different optical transceiver options.

Currently available models are listed in Prices. Please, contact technical support if you are unsure which model to choose.


E1 Interface (2048 kbit/s)
Connector Type RJ-48 (female 8 pins)
Line Code HDB3
Framing Transparent; both framed and unframed modes supported
Error Detection Bipolar Violation
Line Impedance 120 Ohm (Twisted Pair)
Receive Signal Attenuation Range From 0 to -43 dB
Jitter Attenuator In transmit path
Overvoltage Protection TVS
Overcurrent Protection Fuse
Console interface
Connector Type RS-232 DCE, DB-9 (female)
Protocol Asynchronous, 9600 bit/s, 8 bit/symbol, 1 stop bit, no parity
Modem Control Signals DTR, DSR, CTS, RTS, CD
Remote control
Remote login Available in point-to-point configuration
SNMP-based Management Device state monitoring
Diagnoctic modes
Loopbacks Local and remote link loop, port loop, port tributary loop
BER Tester Built-in
Control From console
Box Desktop or frame 1U for two units for 19-inch cabinet
Dimensions 180 mm x 156 mm x 36 mm
Weight 700 g
Power supply
Power source 36 to 72 VDC
Power consumption 20 VA Max
Working temperature 0°...+50°С
Storage temperature -40°...+85°С
Humidity 0 to 80 %, non-condensing

Optical Transceiver Parameters

Specification M13 S13 S15 W13 (W15) WH13 (WH15)
Fiber Type Multimode
Single Mode
Single Mode
Single Mode
Single Mode
No. of Fibers Two Two Two One One
Minimum Fiber Optic Cable Power Budget 13 dB 26 dB 29 dB 26 dB 18 dB
Fiber Optic Cable Minimum Length Limitation No No No No No
Maximum Fiber Optic Cable Length (depends on cable parameters) 2 - 5 km 40 - 60 km 80 - 150 km 40 - 60 km 20 - 40 km
Note W13 and W15 optical modules must be used in pair WH13 and WH15 optical modules must be used in pair
Transmitter Type LED FP LD DFB LD FP LD (DFB LD) FP LD
Wavelength 1310 nm 1310 nm 1550 nm 1310 nm (1550 nm) 1310 nm (1550 nm)
Optical Output Power -19 dBm -8 dBm -5 dBm -8 dBm -14 dBm
Spectral width 200 nm 3 nm 1 nm 3 nm (1 nm) 7,7 nm (2,5 nm)
Maximum Input Optical Power -14 dBm -3 dBm -3 dBm -3 dBm -3 dBm
Receiver Sensitivity -32 dBm -34 dBm -34 dBm -34 dBm -32 dBm


Some of the documents are in Adobe® Acrobat® Reader® format

PDF Installation and Operating Manual (in Russian)

MIB  MIB-files for SNMP-management

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