Alcatel-Lucent 7750 Configuration Manual page 205

Interface Configuration
Note: The E1 encapsulation in the ASAP MDA and in the channelized MDAs is compliant to
G.704 and G.703. The G.703 feature allows a user to configure an unstructured E1 channel on
deep channel MDAs and ASAP MDAs. In G.704, time slot 0 is used to carry timing information
by a service provider and thus, only 31 slots are available to the end user. In G.703, all 32 time
slots are available to the end user. Timing is provided by the end user.
7750 SR Interface Configuration Guide Page 205