Global Tech GT-SDH-155A 63E1 SDH is the compact STM-1 level Synchronous Digital Hierarchy (SDH) transmission system compatible with ITU-T standard. It is designed as a modular system with two 155.520Mb/s optical interfaces to provide an ultra-compact, cost-effective and high capacity platform. It provides fully cross-connect between all tributaries, and can be used as Terminal Multiplexer (TM) or an Add-Drop-Multiplexer (ADM) to build point-to-point, ring and chain transmission network.。

* Achieve Multiplexing from 63 E1 to 2 STM-1 optical interfaces 

* 1U height, 19 Inch width standard

* Service interface

? Two STM-1 optical interfaces, SFP optical module (LC connector)

? Maximum 63 E1 interfaces compliant with ITU-T G.703, optional unbalanced/ balanced interface

* System interface

?  Ethernet management interface: EMU (RJ45 connector)

?  RS232 network management interface: CONSOLE (RJ45 connector)

?  RS232 user channel interface: RS232 (RJ45 connector)

?  External synchronization interface / Extendable management interface :  ETS1/EXM1, ETS2/EXM2 (RJ45 connector)

?  Engineering Order Wire (EOW) interface: PHONE (RJ11 connector)

?  UALM and DALM output interface: U/DALMO (DB9 connector)

* Timing mode

? STM-1 line timing (T11,T12)

? Tributary timing from E1-1 to E1-63 (T2)

? External timing source input (T31/T32), 2048Kbit/s by default and 2048KHz selectable

? External timing output (T41/T42), 2048Kbit/s by default and 2048KHz selectable

? ITU-T G.813 internal oscillator

? The timing source can be auto-switched according to SSM or operator settings

* Supports 1+1 protection and Automatic Protect Switch (APS) with the switching time less than 50ms