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Fiber Optic Multiplexors FMUX/S and FMUX/B
(w/o Ring Support)

Discontinued, recommended replacement is: FMUX/M, FMUX/S

Optical Transceiver Parameters

Models Table

Model Ports SNMP Documentation
E1 Ethernet
No. Mbps

Fiber Optic Multiplexor FMUX/S-4E1/ETM

4 100 Optional PDFInstallation and Operating
Manual (in Russian)

Fiber Optic Multiplexor FMUX/S-16E1/ETM

16 100 Optional


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

  • Transmission of 4 or 16 E1 channels via fiber optic link in transparent (ITU-T G.703) or framed (ITU-T G.703 and G.704) mode
  • Transmission of Ethernet 10/100Base-T channel with 100 Mbps bandwidth
  • Single mode fiber
  • Distance up to 25-40 km
  • Compliance with ITU-T G.703, G.742, G.823, G.955 Recommendations
  • Local and remote loopbacks
  • Integrated BER tester
  • Console RS-232 port
  • Remote management
  • Optional Ethernet 10Base-T port for SNMP-based management (optional)
  • Dry contacts alarm interface
  • 1U construction for 19-inch rack
  • AC or DC power
  • Certificate N ОС-6-СП-1998

Multiplexors FMUX/S-4E1/ETM and FMUX/S-16E1/ETM transmit 4 and 16 E1 channels respectively over one fiber and Ethernet 10/100Base-T channel with 100 Mbps bandwidth over another fiber of two-fiber optic link. All channels have independent sync signals with their own frequencies.

FMUX has LEDs for channels ready state, optic transceiver operability, loopbacks enable state and test mode indication. Internal loopbacks and integral BER tester operation are controllable by the console port located on front panel. 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.

Device state can be monitored by SNMP using dedicated Ethernet 10Base-T port ("-SNMP" option must be ordered).

Alarm indication relay with "dry contacts" interface in compliance with the ITU-T G.742 Recommendation, paragraph 10, is supplied.

The firmware of the device can be updated by user.


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 -12 dB
Jitter Attenuator In transmit path
Overvoltage Protection TVS
Overcurrent Protection Fuse
Alarm Interface
Connector Type desktop version: 6 pin Mini DIN
1U version: DB-9 (male)
Relay Contact Current Up to 600 mA
Relay Contact Voltage Up to 110 VDC; up to 125 VAC
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
Diagnoctic modes
Loopbacks Local, Remote
BER Tester Built-in
Control Via console RS-232 port
Box 1U rack mount for 19-inch cabinet
Dimensions 444 mm x 262 mm x 44 mm
Weight 3400 g
Power source
AC power source 176-264 V, 50 Hz
DC power source 36-72 V
Power consumption 40 VA Max
Temperature 0° - 50°С
Humidity 0 to 80 %, non-condensing

Optical Transceiver Parameters

Specification DW13 DW15
Fiber Type Single Mode, 9/125 Single Mode, 9/125
No. of Fibers Two Two
Minimum Fiber Optic Cable Power Budget 17 dB 17 dB
Fiber Optic Cable Minimum Length Limitation No No
Maximum Fiber Optic Cable Length (depends on cable parameters) 25 - 40 km 25 - 40 km
Note Uses WDM, requires DW15 optical module at opposite end Uses WDM, requires DW13 optical module at opposite end
Transmitter Type FP LD DFB LD
Wavelength 1310 nm 1550 nm
Optical Output Power -14 dBm -14 dBm
Spectral width 4 nm 2 nm
Maximum Input Optical Power 0 dBm 0 dBm
Receiver Sensitivity -31 dBm -31 dBm

MIB  MIB-files for SNMP-management

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