Historical
ANSI T1.403-1999
Network and Customer Installation Interfaces - DS1 - Electrical Interface
This standard provides the requirements for a DS1 metallic interface, referred to as the network interface (NI), for a network-to-customer installation (CI). Requirements include electrical characteristics, format parameters, and physical characteristics at the NI. This standard provides NI compatibility information and is not meant to be an equipment specification. This standard is a revision of ANSI T1.403-1989, and replaces it in its entirety.
Alliance For Telecommunications Industry Solutions [atis]