Nortel QMT12 ADM, Руководство пользователя

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Page 62 of 80 Features and services
553-2731-100 Standard 5.00 April 2000
Provision
Use LD 11 to assign the feature to an ASIM or a co-located or a
stand-alone ADM. It is assigned as ADL in the overlay and to key/lamp pair
number three. The ADM or ASIM must be configured for Hotline.
Transparent Data Networking
Description
This feature provides a transparent data channel for data
modules to perform end-to-end protocol exchange. This means that two data
modules will wait for a circuit path to be established before exchanging
protocol parameters. The data modules and protocols that are supported by
TDN are
• Meridian Communications Adapter (MCA) card in a Meridian Modular
telephone (MMT) set. Uses PSDS and T-Link protocols on external
calls.
• Meridian Communications Unit (MCU), a stand-alone unit. Uses PSDS
and T-Link protocols on external calls.
• Basic Rate Interface (BRI) telephones. Use T-Link, V.110, and V.120
protocols.
• High Speed Data Module (HSDM). When configured to use PSDS.
In X11 release 19, there are three ways to provide a transparent data channel
to accommodate data calls from modules using the above end-to-end
protocols:
• ESN19 signaling on the private network
• STD signaling on the private network with the STDN option (Standard
Signaling TYPE [STYP]=STDN)
• TDN only routes for access to the public network or other vendor PBXs
The TDN feature is an important development for MMT, BRI, and HSDM
telephones that use PSDS, T-Link, and other non-proprietary protocols or rate
adaption schemes, as it allows calls to be tandemed across a private network
before terminating on to a public network. This enables private network users
to take maximum advantage of their own network facilities before entering
the public network.
Note: A network with all PRI trunks using release 19 or greater has data
tandeming capabilities without using ESN19 signaling or TDN routes.