Qcdu2 Co Line Digital Telephone Interface Unit; Qcdu2 Configuration; Qcdu2 Installation - Toshiba Strata DK14 Installation And Maintenance Manual

QCDU2
CO Line Digital Telephone Interface Unit
Circuits per PCB:
one loop start CO line circuit and two digital telephone circuits
Interfaces with:
digital telephones
PDIU-DIs/PDIU-DI2s/RPCI-DI
ADMs connected to the telephones and PDIU-DSs
Does not support a DDSS console or DDCB
Older Version(s):
QCDU1A

QCDU2 Configuration

The QCDU2 may have to be configured to control excessive loudness if the system is close to a
CO or installed behind a PBX telephone system. It does not have to be configured for anything
else. The decibel (db) PAD switch, SW101 controls the loudness by providing a 3 db signal level
drop to, or from, the PBX or CO when set to the PAD position. The switch comes from the factory
set at 0 (for no PAD) meaning no PAD loss.

QCDU2 Installation

A maximum of two QCDU2 PCBs can be installed in the KSU.
To install the QCDU2
1. If the system is located within one mile of the CO or PBX telephone system, set db PAD
switch SW101 to the PAD position.
2. Make sure that the power supply switch is OFF.
3. Slide QCDU2's front edge and FG wire under the System Frame Ground Bar; align and insert
the QCDU2 connector J1 into the motherboard connector (J9 for CO3 first, J10 for CO4
second). (See
Apply firm, even pressure to ensure proper
mating of the connectors. Make sure the
QCDU2's connector edge next to the connector
J1 snaps firmly into the standoffs on the KSU
motherboard. (See
4. Connect the Frame Ground (FG) lead from the
QCDU2 to the screw nearest the QCDU2
located on the system Frame Ground bar.
Remove the "knock-out" from the KSU cover
CO3 or CO4 access slot, and store the "knock-
out" in the slots provided in the KSU base. (See
Figure 1-11.)
Strata DK I&M 5/99
Figure 1-10)
Figure 1-4).

QCDU2 CO Line Digital Telephone Interface Unit

J2
CO 3/4
FG
To System
Frame
Ground Bar
SW101
0 PAD 3
Figure 1-10 QCDU2 Printed Circuit
Board
DK14 Installation
QCDU2A
J1
2391
1-13