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use of a D4 Carrier System and if required, a SLC Carrier System. The
T-Carrier trunks serve for short haul transmissions while long haul
transmissions are served by digital microwave radio and other digital systems.
If the NCTE interface is used with customer premises equipment, a miniature
8-position series jack is used to connect the NCTE to other equipment. The
jack pins are paired off; data transmit pair, data receive pair, a voice pair,
and a mode switch pair. The data pairs support the simultaneous transmission
and reception of digital data in a bipolar format at 56 kb/s. The data pairs
also provide for the xmission of control information to and from the network.
The voice pairs supports analog signal transmission and provides for call
setup, disconnect and ringing functions. The mode control pair provides
signals to the network when a change in mode (voice to data/data to voice) is
requested by the customer.
A CSDC call is originated over a 2-wire loop which can also be used for
Message Telecommunication Service (MTS) calls. Lines may be marked (MTS/CSDC
or CSDC only). Touch tone is needed to originate a CSDC call. Originations may
be initiated manually or with Automatic Calling Equipment (ACE) if available.
Digit reception, transmission and signalling follow the same procedures used
for a MTS outgoing call on CCIS or non-CCIS trunks. However CSDC calls are
ALWAYS routed over digital transmission facilities.
The long term plan also allows for EA-MF (Equal Access-Multi Frequency)
signalling and improved automatic message accounting (AMA) records. A CSDC
call is screened to ensure that the originating party has CSDC service and
that the carrier to be used provides 56 kb/s voice/data capability. A blocked
call is routed to a special service error announcement. Non-CSDC calls are not
allowed to route over CSDC-only carriers. Non-payer screening is not allowed
for CSDC calls using CCIS signalling.
A CSDC call is routed directed to the carrier or indirectly via the Access
Tandem (AT) or Signal Conversion Point (SCP). The call is terminated directly
from the carrier to the end office or indirectly via the AT or SCP. Signalling
for direct routing is either CCIS or EA-MF and is assigned on a trunk group
basis.
The AT is an ESS switch which allows access to carriers from an end office
without requiring direct trunks. Signalling between end offices and the AT is
either EA-MF or CCIS. Trunks groups using EA-MF signalling can have combined
carrier traffic. Separate trunk groups for each carrier are required for CCIS
signalling.
The SCP is an ESS switch which allows access to carriers using only CCIS
signalling from offices without the CCIS capability. Separate trunk groups for
each carrier are used between the originating end office and the SCP. Separate
trunk groups are optional between the SCP and the terminating end office and
the terminating end office. Signalling between the end office and the SCP is
MF. The SCP must have direct connection to the carrier using CCIS signalling.
=========================
=Remote Switching System=
=========================
The RSS can be used as a remote access point for CSDC. The compatibility of
RSS and CSDC improves the marketability of both features. The RSS design
allows a provision for the support of D4 special service channel bank
plug-ins. This provision allows for such applications as off premises
extensions, foreign exchanges lines, and private lines. Thus the RSS can be
used as a CSDC access point in a configuration similar to the CSDC RX
arrangement.
================
=Centrex/ESSX-1=
================
The CSDC feature is optionally available to Centrex/ESSX-1 customers. Most of
the capabilities of Centrex service can be applied to Centrex lines that have
been assigned the CSDC feature. In voice mode, the Centrex/CSDC line can
exercise any of the Centrex group features that have been assigned to the
line. In the voice/data mode, several Centrex features are inoperable or
operate only on certain calls. The CSDC feature can be provided for a Centrex
group as follows:
1. Message Network Basis (MTS)
2. IntraCentrex group basis
3. InterCentrex group basis
4. Any combination of the above
===============================
=User Perspective for the CSDC=
===============================
To establish a CSDC call, a CSDC user goes off hook, receives dial tone and
dials. The dialing format for the CSDC/MTS is as follows for interim plan:
#99 AB (1+) 7 or 10 digits (#)
The customer dials '#99' to access the CSDC feature. The 'AB' digits are the
carrier designation code. No dial tone is returned after the 'AB' digits. The
1+ prior to the 7 or 10 digit directory number must be used if it is required
for MTS calls. The '#' at the end is optional, if it is not dialed, end of
dialing is signalled by a time-out.
The long term dialing format for the CSDC/MTS is as follows:
#56 (10XXX) (1+) 7 or 10 digits (#)