Comdial FX Series Specifikace stáhnout pdf (Strana 60)

Line and Station Boards and Special Components

GCA39-825 Rev 2, Issue 4/02 Page 6 Printed in the USA

Digital T-1 and ISDN Primary Rate Interface Boards

Part Number: FXT1-24 (24-Channel Digital T-1 Line Board)

Part Number: FXT1-PRI (23- Channel Digital T-1 with Primary Rate Interface Daughter Board

and Firmware Upgrade)

• 1 synchronization card is required for T-1 operation and for PRI applications. Only 1 sync

card is needed. (Refer to Auxiliary Equipment in this section for more information.)

• A T-1 Interface allows up to 24 channels of voice transmission over a single 4-wire cable.

• The T-1 supports loop start lines, ground start lines, tie lines, and DID lines. You must

determine what portion of the 24 channel T-1 should be dedicated for each particular type of

line needed in your configuration. The default line in VMMI for all T-1 channels is Loop

Start.

• A customer service unit (CSU) is built into the T-1 option board to terminate the T-1

channels. This eliminates the need to install a CSU external to the system. The CSU protects

the board against voltage surges, provides transmission drive up to 6,000 feet for a direct host

to remote connection, and performs diagnostic tests for the network.

• If necessary, an external CSU/DSU can be added to the system to break out channels for data.

• Since each board slot in the system has 32 time slots, each T-1 board only needs 1 board slot

for full 24 channel operation.

• ISDN-PRI provides a way for subscriber to get digital service from the Telephone Company

over 2 special pair of wires.

• The PRI card supports 23 bearer channels and 1 data channel.

• With the “D” channel, ISDN provides enhanced signaling capabilities, which can be

beneficial in data-intensive environments. (Currently only voice and modem calls are

supported.)

• PRI circuits allow for dynamic allocation of trunks. So, if 10 channels have been allocated to

DID and an 11

caller calls in, instead of a busy, the 11

caller can be floated to another

available trunk.

• Feature support includes: Calling number identification services, PRI interactions with lines,

line groups and system features, and direct dialing in.

• A PRI-board can be purchased from Comdial in a pre-built standard package, or a T-1 board

can be upgraded to a PRI-board. All that is required is a firmware upgrade and Interface

board add-on to the standard T-1 option card.

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Comdial FX Series Specifikace Strana 60