Instruction manual

Features
RBS is appropriate for voice and voice-grade data (up to 1200 bps), but
facilities using RBS cannot accurately transmit digital data because
digital data uses high-speed data rates, such as 64 kbps. Therefore, the
channel is limited to voice and analog voiceband data applications.
■ Common-Channel Signaling
CCS is an out-of-band signaling format that places the signaling bits for
channels 1 through 23 into the 8-bit word of the 24th channel. This
restricts DS1 from using the 24th channel for voice or data transmissions.
D4 framing does not preclude the use of CCS, but CCS is not compatible
with D4 channel banks because the D4 channel banks only recognize
RBS. Coupled with B8ZS coding, CCS can support digital data up to 64
kbps per channel.
ESF framing should be used to take advantage of its improved maintenance,
diagnostic, and testing capabilities (the ESF T1 CSU is required to interface with
the network). If the transmission between two systems is voice-only, RBS
should be used for all 24 communication paths. For voice transmission, both
ZCS and B8ZS line coding can be used to satisfy the ones-density requirement:
the preferred line-coding format is B8ZS, which is needed for 64-kbps digital
data.
The framing and signaling formats depend on the network and interconnection
devices (CSUs) used. For example, many CSUs only support ZCS line coding.
NOTE:
Digital data up to 64 kbps is possible only in PRI mode. Also, ESF framing
mode, CCS signaling, and B8ZS line coding are required. An ESF-T1 CSU
must be used for interbuilding DS1 connections.
PRI Programming Options
The following options should be programmed for PRI facilities connected to a
100D (DS1) module.
PRI Telephone Number
The PRI telephone number is a string of up to 12 digits (any combination of
digits 0 through 9) assigned to each PRI channel. This string matches the
number sent by the network that indicates the number dialed by the outside
caller. The communications system uses the number to route the call to the
correct destination.
Primary Rate Interface (PRI)
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