more topics
|
Primary Rate Interface (PRI) and T1 Feature
Description
Tandem PRI Trunks
You can network MERLIN MAGIX Integrated Systems (Hybrid/PBX mode only) with
one another and/or with MERLIN LEGEND (Release 6.1 or later), DEFINITY ECS,
DEFINITY BCS, or DEFINITY ProLogix Solutions systems. Tandem PRI and tie trunks
(T1-emulated voice/data or analog) are supported as private network lines/trunks.
PRI private trunks provide the most features and advantages. This topic outlines
the general considerations for setting up such trunks. Details are provided
in System Programming and in other sections of this guide as noted. Full information
about private networks is presented in the Network Reference.
PRI tandem trunks provide the following benefits:
- Transparent Dialing of Extension Numbers on Remote Systems. Using
PRI tandem trunks, T1, or analog tie trunks for networking, a dial plan that
provides access to remote extensions is set up locally. This allows calls
to extensions on a remote system to be dialed using SA or Shared SA buttons.
- Cost-Effective ARS Dialing from a Remote System. Using tandem PRI
trunks or tandem tie (analog, or T1-emulated voice or data) trunks for networking,
users can dial ARS calls normally. The local ARS is set up to route calls
through the system that provides the best cost benefit. For example, if the
local system is in the 908 area code and a remote networked system is in the
415 area code, calls made from the local system to the 415 area code can be
routed through the remote system. This can mean considerable toll savings.
- Faster Data Transmission. Networked PRI tandem trunks support digital
data speeds of up to 128 kbps between networked systems for enhanced 2B data
videoconferencing and other data applications. Earlier releases permit a maximum
speed of 112 kbps between connected systems. T1-emulated data channels, when
used as tandem trunks, allow speeds of up to 112 kbps.
- Incoming Call Display. For 4400-Series (except the 4400D), MLX,
or TransTalk 9040 (when connected to a TDL port) display telephone users,
the System Manager may program the incoming call display to allow alphanumeric
labels, extension numbers, or both to be shown for calls routed among networked
systems on tandem PRI facilities. For additional information, see Uniform
Dial Plan Features and Display.
- Fractional Use Support. You can tailor your use of PRI B-channels
with drop-and-insert equipment that allows fractional use of B-channels for
non-MERLIN MAGIX data/video communications between sites at 64 kbps per channel,
while keeping the remaining B-channels for MERLIN MAGIX PRI voice/data traffic.
The PRI D-channel must remain active. The system also allows this type of
fractional use of T1 circuits programmed as T1-emulated tie and tandem trunks.
