AT&T DS1/DMi/ISDN-PRI manual Field

ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2 7-63

Field 15

Field 16

Field 17

Some applications require that the contents of the signaling channel or the ISDN- PRI D-channel be inverted to guarantee that the minimum ones density be maintained. This field shows whether the signaling channel is inverted or not. Field encodes and their descriptions are:

–(Dash) not applicable or ZCS line coding is translated in field 9. The dash is appropriate for all applications of the ANN11 circuit pack. RBS does not use the 24th-channel to transmit signaling information. 24th-channel signaling via the BOS interface uses A and B bits for signaling and the channel structure is such that the ones-density is never violated.

0Assigns that the signaling information, contents of the ISDN-PRI D-channel, is inverted.

Either 0 or 1 must be administered for ISDN-PRI. Recall that B8ZS is recommended for ISDN-PRI applications. However, not all transmission facilities will permit B8ZS on an end-to-end basis. Administration must be coordinated with the network facilities/distant end to ensure compatibility.

NOTE: This field must be a dash (–)when ZCS line coding is selected with ISDN.

1Assigns that the signaling information, contents of the ISDN-PRI D-channel, is not inverted. The 1 option (No Inversion) is strongly recommended for use when B8ZS is administered.

The DS1/DMI-BOS applications should be administered with a dash (–).

The DMI-MOS/ISDN-PRI applications may be optioned (0) indicating metallic copper cable facilities. The (1) option is used to show nonmetallic fiber cable.

NOTE: Terminating fiber cable directly on the DS1/MFAT carrier or universal module port carrier is not currently supported. Therefore, the (1) option is not applicable.

This field is added to bring System 85 R2V4 into compliance with EIA specification PIN-1429. This EIA specification relates to bit-oriented-signaling (BOS); message- oriented-signaling (MOS) is defined by a CCITT specification.

Field encodes and their descriptions are:

–(Dash) not applicable

NOTE: The dash is appropriate for all applications of the ANN35 and TN767 circuit packs (both DMI-MOS and ISDN-PRI).

0Appropriate for all applications of DS1/DMI-BOS except when connecting to a switch that uses the Canadian style of signaling.

1Used when connecting to a DS1/DMI-BOS that uses the Canadian style signaling as specified in PN-1429.