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ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85
7-15
Field 15 V4 Only
Some applications require that the contents of the D-channel be inverted to
guarantee that the minimum ones-density be maintained. This field shows whether
the signaling channel is inverted. Field encodes and their descriptions are:
(Dash) means ZCS chosen in procedure 260. This is the default when ZCS is
chosen (this automatically inverts the D-channel).
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 BOS uses A and B bits for signaling, and the channel structure is
such that the ones-density is never violated.
Selects inverted signaling information (contents of the 24th-channel). Either 0 or
1 must be administered for MOS. Recall that B8ZS is recommended for MOS-
based 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.
-
0
1
Selects uninverted signaling information (contents of the 24th-channel). The 1
option (no inversion) is recommended for use when B8ZS is administered.
Field 16
Field 17
V4 Only
The DS1/DMI-BOS applications should be administered with a (–).
The DMI-MOS/ISDN-PRI applications should be optioned (0) for use when
connecting to metallic copper cable. Connections to fiber cable are not currently
supported. Therefore, option one is not applicable.
V4 Only
This field is added to bring a System 85 R2V4 into compliance with EIA
specification PIN-1429. This EIA specification relates to BOS; MOS is defined by a
CCITT specification. Field encodes and their descriptions are:
-
0
1
(Dash) means not applicable. The dash is appropriate for all applications of the
ANN35 circuit pack (both DMI-MOS and ISDN-PRI).
Appropriate for all applications of DS1/DMI-BOS except when connecting to a
switch that uses the Canadian style of signaling.
Selected when connecting to a DS1/DMI-BOS that uses the Canadian style
signaling as specified in PN-1429.