Toshiba Strata DK40 - Exchange Line Interface Unit; Tcou; TCOU Installation or Replacement; TCOU Removal

DK40 Installation TCOU Exchange Line Interface Unit
2-32
Strata DK40 I&M Manual Spring 1999
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
TCOU
Exchange Line Interface Unit
System:
DK40 Base KSU (mounts on KSU TMAU)
Circuits per PCB:
four loop start exchange line circuits
Interfaces with:
loop start lines
Compatible Slot(s):
slot 12 (KSU)
Older Version(s):
none
The optional TCOU PCB installs onto the TMAU motherboard. (See Figure 2-19 and Tab le
2-7 on Page 2-34 for information on controls, indicators and connectors.)
Note
Only one TCOU or TBSU can be installed on the motherboard.
TCOU Installation or Replacement
1. Make sure the power supply (TPSU16F) DC power switch is OFF.
2. Mate the TCOU male connectors P110, P111, P112 to P10, P11 and P12 respectively on
the TMAU. Apply firm, even pressure to ensure proper connection. See Figure 2-7 for
installation information and Figure 2-29 for wiring.
3. Secure the three plastic stand-off tabs and install screws in upper right and lower left
corners.
4. Set decibel (dB) PAD switches SW101, SW201, SW301, and SW401 to the appropriate
position. In most cases set to the normal position (NOR). Switches are factory set at the
0 (0 dB signal level drop) position. If Exchange lines are connected to a PBX or are in
close proximity to the local exchange, set the PAD positions to 3 to provide a -3 dB
signal level drop between the PBX and Exchange line.
5. Ensure that SW1 has been set for A Law operation and not Mu Law operation.
6. Slip the spade connected to the green/yellow wire under the second screw from the right
on the TPSU power supply (see Figure 2-19). Tighten the screw until the spade is
snugly secured.
TCOU Removal
If you need to remove/replace the TCOU, make sure the power supply (TPSU16F) DC power
switch is turned OFF.
➤ To remove the TCOU
1. Loosen the screw on the TPSU power supply and free the spade.
2. Loosen and remove screws securing the TCOU to the TMAU (see Figure 2-19).
3. Pull back the three plastic stand-off tabs and pull up on the TCOU until P110, P111 and
P112 are unplugged.