SDH 622 multiplexer:

OTS-155/622 STM-1/4 Compact Multiplexer
STM-1 Optical interface can up to 10 channels and perfect network management.
 

• Providing 1008 × 1008 VC12 level or 16 × 16 VC4 level non-blocking cross-connection, allows configuring STM-1 system to/from STM-4 system only by replacing interface modules; simply up grading.
• Providing E1, E3, E4, 10/100Base-T, V.35/V.24. STM-1e/o interfaces.
• Providing 4 extended slots reserving traffics to be extended.
• Providing Fast Ethernet interface with easily modulate, double IP exchange function.
• Providing timing synchronous interfaces as follows, external clock, SDH liner clock, 2M tributary clock, and STM-1 and STM-4 timing source inputs.
• Provides perfect network management system with the application of upgrading, flexible network configuration to control various subnet and remote monitoring.