Specifications

December 2008 Page 20–11
Chapter 20. Addressable Two-Wire Voice (PBW/PBT) Module
20
if the module is functional and red if the module is
non-functional.
The remaining four LEDs, beginning at the top
left, work as follows:
PBX CH BUSY – This green LED, when lit,
indicates that the (network) line is busy. The line
becomes busy as soon as any phone on the
network is lifted off the hook.
BREAK-IN – This green LED is lit when a user
enters the break-in code (#00) on the phone
connected to the module.
LINE IN – For a PBW module, this green LED is
lit when the phone connected to the module has a
call in progress. For a PBT module, it is lit when
the line is active with the PBX.
LINE OUT – For a PBW module, this green LED
flashes when the phone connected to the module is
ringing (i.e., when its three-digit extension is
dialed). For a PBT module, it flashes when the
PBT module number is rung (i.e., when its three-
digit extension is dialed).
20.5 Acceptance Test
As noted earlier, we recommend that you perform
the acceptance tests for each Addressable Two-
Wire Vo ice (PBW/PBT) Module as you install it,
before moving on to the next chassis. Because the
PBW/PBT acceptance tests require at least two
modules/chassis, however, you must install at
least two before beginning testing. You can then
test each additional module as you install it.
Before beginning your testing, make sure you
have completely installed two modules in their
respective chassis (i.e., inserted the modules,
attached their rear interface modules, assigned
their phone numbers, and connected the telephone
or PBX). Whether you are testing the PBW/PBT
modules for an entire network or a single module
(e.g., after adding an additional station to your
network), use the test procedure described below.
Note that you initiate each step through a PBW
module, as they are the modules with the tele-
phones attached. If you are testing a PBT module,
you only need to perform Steps 1, 3, 5, and 6.
To test each PBW/PBT module, complete the
following steps (skip Steps 2 and 4 when testing
PBT modules):
1. Test the status LED.
If you have not yet installed the module, do so
now following the instructions in the
“Installation” section earlier in this chapter.
Complete the entire installation procedure for
the terminal, including assigning the module’s
DS0 time slots.
Note that the first acceptance test occurs when
you install the PBW/PBT module in the (live,
unlocked) chassis. Initially, the red/green
status LED is red. If the module is functional,
the status LED turns green within 20 seconds.
If the module is non-functional, the status
LED stays red, even after 20 seconds have
elapsed.
2. Check for a network dial tone.
If you are testing a PBT module, skip this
step.
Lift the handset from the telephone. You
should hear the network dial tone (which
sounds different from the dial tone on your
home phone). Hang up. Note that if you keep
the handset off the hook for more than 20
seconds, you will hear a busy signal. This is
because of the “timeout” feature, which kicks
in if you have not dialed or hung up within 20
seconds.
3. Check for a PBX dial tone.
Perform this step only if your network
includes a PBT module connected to a PBX.
Pick up the phone at any station with a PBW
module. When you hear the network dial tone,
dial the number for the PBT module. You
should hear the PBX dial tone (which will
sound different from the network dial tone).
Hang up.
4. Place a call to and from another station.
If you are testing a PBT module, skip this
step.