Comdial FX Series Spezifikationen Seite 116

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Defining T1/PRI Operation
T1/PRI is the digital two-way transmission of telecommunications over a single high-speed circuit.
Up to 24 separate voice or data transmissions form digital pulses that are transferred at the rate of
1.544 million bits per second (Mbps) over the T1/PRI line. At the receiving end, the digital pulses
are decoded into 24 separate circuits.
Pulse characteristics such as repetition rate, pulse width, pulse amplitude, and average ones density
((ratio of one (1) bits to zero (0) bits)) are as specified by digital signal level 1 (DS-1) described in
American National Standards Institute Specification, ANSI T1.403-1989.
Detailing Where You Can Install T1/PRI Boards and Its Supporting Needs
You can install up to six FXT1 boards in the FX II. You can install these six boards in any available
universal board slot. Of course, any other line boards that you install, reduce the number of lines
available for T1/PRI service and thus reduces the number of T1/PRI boards you can install.
Whenever you install one or more boards, and the FS Series system is receiving its timing signals
from an external source (the usual case), you must install one synchronization card (DXOPT–SYN)
on the auxiliary board. This means when you connect the system to central office (CO) lines, you
must include a synchronization card, and the FX II clock must be controlled by CO signaling.
Calling Party Number Type, Called Party Number Type
A programming choice that defines the number configuration that the system recognizes for both
incoming (called party) and outgoing (calling party) calls over an ISDN line. The configuration that
installers choose is based upon the type of service that they request from the service provider.
There are several choices available, but the most common choice is Subscriber (default setting) and
Dynamic (for international, national, and subscriber services). When they choose Dynamic, installers
must also set the National Prefix to 1 and the International Prefix to 011.
Network Specific Facility
There are specific types of ISDN service that can be provided by a service provider. These service
types are specified by numbers 1 through 31. The installer must contact the service provider to
obtain the facility coding value for the provided service. Installers then program this number that
identifies the type of ISDN service being supplied to the system.
IST Board for Avalon Pull-Cord Support
To support Avalon pull-cord signaling, Comdial makes an IST board that interfaces with the Avalon
pull-cord device. The product code for this board is FXISTA-16. The FXISTA-16 board has no
audio circuitry since the pull-cord signaling device requires no audio interface.
To configure the Avalon IST board, under BOARD CONFIGURATION/SLOT ASSIGNMENTS
or CABINET VIEW, select FXIST-16.
112 – Understanding the Features
GCA40–242 General Description
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