GTE Omni Si Database Technical Practices Issue 1 Manual

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RELEASE28.0 RLTs (Release Link Trunks) are used to minimize the
LINK TRUNKS
number of interconnecting trunks required to connect a main
system with branch systems for CAS operation and to provide the
control and features required by this integral configuration. Both
the CAS main and the branch must have the special capability of
using 
RLTs. Additional hardware and revised data base
distribution are required to incorporate 
RLTs into the system.
However, 
RLTs are not tied up for...

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OMNI PBAX (MAIN)
1BRANCHES
CENTRAL OFFICE TRUNKS
Figure 28.1Release Link TrunksIf a call is directed to an idle station but the station is not
answered within the selected time-out interval, the system
recalls the attendant by means of a preselected idle RLT. On
recalls, the appropriate audible signals are extended to the
attendant to identify the type of call. The tone is heard only by the
attendant because the system delays cut-through long enough
to permit any required...

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The functions of the PRLTs can be summarized as follows:
The branch system uses the PRLT to send supervisory and
information signals to the CAS Main, and receives supervisory
and address signals from the CAS equipment to direct call
switching at the branch location. Only the branch can seize the
PRLT to initiate the sequence. The system can extend stations
or tie trunks to outgoing trunks via the PRLT if this feature is
required.
The system supports a maximum of 16 PRLTs.
Refer to the...

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The manner in which the call is completed varies according to
the status of the local line selected. If the call is successfully
terminated, immediate ringback tone is transmitted to the CAS
Main and the CAS attendant operates the RELEASE pushbutton.
The RLT interprets this as an on-hook condition, the system
then reconfigures the call and connects the incoming trunk to the
destination station.
The four-wire E&M RLT provides audio frequency transmission
via the T, R and 
Tl, Rl leads,...

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29.0 The Tl digital trunk link allows the system to receive and
transmit time-division-multiplexed 
Tl carrier data to and from a
channel bank at the far end. A 
Tl digital data link can support 24
channels of multiplexed Tl-type data. The two-line (transmit
and receive) 
Tl trunk link provides the same traffic capabilities
as 24 individual analog trunk lines. The 
Tl digital trunk link
(Figure 29.1) consists of the 
Tl interface cards at the system
end, a channel bank at the far end, and...

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The Tl interface is compatible with WECO D2 and D3 signaling
format channel banks or Siemens Transmissions Systems 9002A
(24) or 9002B (48) channel banks at the far end. The far-end
channel bank interfaces with loop-start, ground-start, or 
E&Mtrunks that can be connected to any standard telephone and
most data terminals, to a system, or to a CO that supports 
Tl-type communications. Two systems can be connected via a 
Tllink without the use of a channel bank at either end. The...