Station optical modem FM-STM1-02

Technical parameters


FM-STM1-01 is designed for ring and line STM-1 SDH transport networking.

Selecting the suitable SFP module (optical transceiver) provides the flexible modem tuning for different optical cables and their length.

Operating within STREAM-2, switching (drop-and-insert) of two E1 streams into the STM-1 stream is provided.


  • Organizing high-speed trunk communication channels;
  • Operation in one cable with analog equipment;
  • Integrated regenerator monitoring channel;
  • PC control and diagnostics;
  • Easy maintenance;
  • Integrated input circuit protection.

Technical parameters


Е1 interface 
Number of interfaces 64, connector Molex 74337-0011
Standard As per ITU-T G.703, G.704
Line code HDB3
Wave impedance 120 Ohm
Optical interface 
Line rate 155 Mbps
Number of ports 2 optical SFP interfaces
Compliance G.707
Protection 1+0, 1+1
Ethernet Interface 
Number of interfaces 2
Interface type  10/100BaseT 802.3 and 802.3U-compliant 
Connector  RJ-45 
Dimensions (HxWxD), mm 262×35×295 mm






                     Using FM-STM1-01 within “STREAM-2”                                                                           

shema 1             


Using FM-STM1-01 within a linear SDH structure without stream protection

shema 2

Using FM-STM1-01 within a ring SDH structure with 1+1 stream protection

shema 3