Atlas KDX T1 Service Manual

Understanding The KDX-T1 Card

Through time division multiplexing, the KDX-T1 card increases the efficiency and
economy of the KDX-500 system by providing up to 24 channels on two twisted pairs
while only using 2 FPU slots in the KDX-500 system.

This multiplexing allows two-way voice and data communications at 1.544 Mbps with
the Central Office.

When the KDX-T1 is installed, the KDX-500 supports the following signaling protocols.

• Loop Start (with ANI)

• E&M

• DID (Future Release)

Loop Start will support Centrex type features such as hook flash and pause. Dialing can
be DTMF or Pulse.

E&M and DID will support wink start and delay start. Dialing can be DTMF or Pulse.

Note: The KDX-T1 card has been engineered to work with or without a customer
supplied CSU (Channel Service Unit).

Installing the KDX-T1 card

Turn the AC power off and remove the cover(s) from the KDX-500 system.

Using Figure 1 below locate where you will be installing the KDX-T1 card. You can
install the T1 card in FPU slots 2 or 4 in the main KSU and/or FPU slots 1,3,5 and 7 in
any one of the 3 expansion KSU’s.

Note: The slots to the immediate right of the T1 card cannot be used.

Figure: 1

If the KDX-T1 is installed in the wrong slot the Central Processor will not recognize
the card.

It is recommended that FPU #4 in the main and/or FPU #7 in the expansion(s) be
used for the KDX-T1 location. This will reduce the amount of switch cables needed
for your installation.

Note: Up to 4 T1 cards may be installed per KDX-500 system.

Typical KDX-500 card configurations

The examples below show typical configurations and how the system assigns the T1
channels.

When the central processor identifies a KDX-T1 card it automatically treats it as if
there are 3 COU-A cards installed.

Example 1:

KDX-T1 card installed in FPU #4 = T1 Channels are C.O. ports 1 – 24 in system
programming.

Note: FPU #5 cannot be used.

Example 2:

COU-A card installed in FPU #3 = C.O. ports 1 – 8 in system programming.
KDX-T1 card installed in FPU #4 = T1 Channels are C.O. ports 9 – 32 in system
programming.

Note: FPU #5 cannot be used.