Lucent Technologies MERLIN LEGEND Release 6.1 Feature Reference page 552

MERLIN LEGEND Communications System Release 6.1
Feature Reference 555-661-110
Features
Primary Rate Interface (PRI) and T1
— MCI 900. Providing 900 service numbers.
The system supports the following local DMS-100 local exchange carrier
services:
— Virtual Private Network (VPN). For calls between the MERLIN
— Maximal OUTWATS and INWATS. For domestic outgoing long-distance
— Foreign Exchange. For local call rating of calls from the local exchange
— Tie Trunk. For private exchange call rating of calls placed on a
— Integrated Services Access (also called call-by-call service selection ).
T1 is the factory setting and, when selected for the DS1 facility, allows each of the
24 channels to be programmed to emulate tie (emulated voice or Switched 56),
loop-start, ground-start, or DID lines or to provide Switched 56 data-only service in
any combination. Therefore, a single 100D module can take the place of 24
regular outside lines/trunks.
In Release 6.0 and later systems (Hybrid/PBX mode only), T1-emulated voice tie
channels and T1-emulated data tie channels can be used to connect MERLIN
LEGEND Communications Systems with one another and/or with DEFINITY ECS
and DEFINITY ProLogix Solutions communications systems in private networks.
They act as tandem tie trunks. If the type of service desired is PRI, tandem PRI
trunks can perform the same function. (See
If common-channel signaling (CCS) is selected, 23 channels are available for
emulation, and the twenty-fourth channel carries trunk supervision signals. (See
"Signaling Mode" on page
Framing Format
To identify the DS0 channels, the DS1 signal is segmented into blocks of 193 bits
called frames . A frame consists of 24 eight-bit words (one for each channel) plus a
framing bit at the beginning of each frame (24 words x 8 bits = 192 bits). Thus, a
framing bit appears in every one hundred ninety-third bit position of the
1.544-Mbps DS1 signal.
Frames repeat at a rate of 8,000 per second. Each frame repeats DS0 channels 1
through 24 sequentially.
LEGEND Communications System and another communications
system (for example, another MERLIN LEGEND Communications
System).
voice calls (not including support for bands or zone); for domestic toll-
free incoming calls.
in the area served by the foreign exchange.
dedicated central office facility between the MERLIN LEGEND
Communications System and another MERLIN LEGEND
Communications System.
Allows a B-channel group to carry a variety of local services.
506.)
"Tandem PRI Trunks" on page
Issue 1
August 1998
Page 503
507.)
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