Digital Signal 1, a T-carrier signaling scheme devised by Bell Labs
DS1 |
This type of multiplexing is needed when the customer wants to terminate the DS1 or DS3 in the central office and wants to ‘pick up’ lower level services.
When operating as a pure ADM, the 454 could add and drop circuits from OC-192 down to Digital Signal 1 (DS1) -- later it would support Wavelength Division Multiplexing (WDM).