TXC-03453B Datasheet | Transwitch

FEATURES S a at .D w w w TL3M Device Triple Level 3 Mapper TXC-03453B DATA SHEET DESCRIPTION Each of the three channels of the TL3M can map a DS3 line signal into an STM-1 TUG-3 or STS-3 STS-1 SPE SDH/SONET signal. An E3 signal can be mapped only into an STM-1 TUG-3. The TL3M interfaces to an STM-1 or STS-3 SDH/SONET signal using a byte- wide parallel interface in the Tran Switch Tele Bus format. The TL3M supports Drop bus and Add bus SDH/ SONET timing modes. Drop bus timing provides the timing signals for the add side. Timing for both buses is independent for the Add bus timing mode. Individual POH bytes are mapped into a RAM interface for microprocessor access and to an external interface for external processing if required. In the add direction (except for the B3 byte) POH bytes may be inserted individually from RAM locations, from the external interface, or from the local side/alarm indication port. An option is provided to generate an unequipped channel or AIS. An external...