Specifications

December 2008 Page 13–7
Chapter 13. Four-Wire Voice (V4W) Module
13
2. Start the FCS.
Bring up the FOCUS Configuration Software
(FCS), if it is not already running, by clicking
on the FCS program icon .
3. Bring the FOCUS chassis “on line”.
Click on the “Online” speed button
.
This uploads to the FCS the current status,
settings, operating statistics, etc., for the
FOCUS chassis — and the V4W module.
4. Unlock the FOCUS chassis.
If the chassis is locked, execute the “Unlock
Configuration” command on the FCS Setup
menu or click on the “Unlock FOCUS
Chassis” speed button. Enter the password
(factory default is focus1). This puts the
chassis — and the V4W module — into a
configurable state.
5. Put the FOCUS framer(s) in loop back.
You do this through the FCS.
To make the loop back using the FCS,
execute the “Framer Local Loop Back…”
command on the FCS Test menu for each
transceiver (e.g., X1-1, X2–1) on the chassis.
(See the FCS online help facility: Contents >
Loop Back Functions > Transceiver Loop
Back Tests > Turning On a Loop Back Test).
This method loops the signal back through the
V4W module and the test set.
6. Connect your test equipment to channel A
on the V4W interface module’s P1 block.
On channel A of the P1 terminal block,
connect the “transmission” wires from the test
set to the input connections and the “receive”
wires from the test set to the output connec-
tions (using up to 14 AWG stranded wire).
Refer to Figure 13-1 for an illustration of the
interface module connections.
7. Test the frequency response for channel A.
Use the FCS to set the transmit and receive
base and offset settings for channel A to 0 dB
(the default settings).
Next, on the test set, set the transmit
frequency to 1004Hz and the transmit
amplitude to 0dB.
Observe the receive frequency on the test set.
8. Test the amplitude response for channel A.
As in Step 7, use the FCS to set the transmit
and receive base and offset settings for
channel A to 0dB (the default settings). Set the
transmit frequency on the test set to 1004 Hz.
Next, on the test set, set the transmit
amplitude to 0dB. Observe the receive
amplitude on the test set.
Repeat this test, setting the transmit amplitude
on the test set to at least two settings between
-1dB and -16dB. Observe the receive
amplitude on the test set at each level as
appropriate.
9.
Test input and output offset for channel A.
Use the FCS to set the transmit base and offset
settings for channel A to 0dB (the default
setting). Set the test set’s transmit frequency
to 1004Hz and the transmit amplitude to 0dB.
Next, use the FCS to set the receive base and
offset settings for channel A to 0 dB. Observe
the receive amplitude on the test set.
10. Test the -16dB input/+7dB output option.
Use the FCS to set the base level dB for
channel A to -16dB receive/+7dB transmit and
the receive and transmit offsets to 0db. Set the
test set’s transmit frequency to 1004Hz and
the transmit amplitude to 0dB.
Observe the receive amplitude on the test set.
Repeat this test, setting the receive offset for
channel A to -1dB and -7dB and then the
transmit offset to 0dB and +7dB. Observe the
receive amplitude on the test set for each
setting.