Specifications

Page 13–6
FOCUS System Manual
13.4.2 Carrier Group Alarm
Carrier Group Alarm (CGA), is the combination
of Carrier Failure Alarm and trunk conditioning.
The end (node) receiving out-of-sync controls the
CGA, transmission of Yellow alarm and the local
Red alarm. CGA must be enabled on both ends (at
each node) for correct operation.
CGA can be enabled on a per-stream basis by
clicking on the appropriate menu item located
below the top level “Mode” menu item. The
default setting for CGA is disabled. The Mode
menu-item will be checked if enabled. If disabled,
then the Yellow alarm will not be delayed or
extended and trunk conditioning will not be
performed. Additionally, when CGA is disabled,
trunk conditioning is not done on the voice
modules.
Definitions:
• Carrier Failure Alarm (CFA) is the
detection of the beginning and end of a
carrier system outage, a Red alarm or
Yellow alarm starts the CFA and controls
the trunk conditioning process at both ends.
•Red alarm begins after 2.5 sec. of a
sustained out-of-sync condition and ends
after 10 sec. with no out-of-sync errors. It is
during this period that trunk conditioning is
done on the voice modules.
•Yellow alarm is transmitted from the side
detecting the out-of-sync condition. When
CGA is enabled, the Yellow alarm is trans-
mitted during Red alarm period. In this
case the side receiving the Yellow alarm
will receive it for a minimum of 12.5 sec.;
during this time the trunk conditioning is
performed on the voice modules. If CGA is
not enabled, Yellow alarm duration follows
the out-of-sync timing from the remote side
with no delays or extended timing and
trunk conditioning is not performed.
•Trunk conditioning is the action of writing
fixed signalling bit patterns to the voice
modules when a stream is in Red or Yellow
alarm. Trunk conditioning occurs only on
the following channel modules, V4W
(configured with Signaling enabled), V2T,
V2W, FXO & FXS. The voice module
must be mapped to a stream which has
CGA enabled.
13.5 Acceptance Test
As noted earlier, we recommend that you initially
install and test the V4W module and interface in a
“test” chassis (i.e., one that is not part of an
operating network). This way, you can quickly
perform the acceptance test without interfering
with a live network.
To perform these tests, we recommend either the
HP 3551A or HP 4934A (with option 001
installed) transmission test set. Compare all your
test results with the specifications in Table 13-1 to
determine acceptability.
To test the V4W module’s frequency and
amplitude response to make sure it is functional,
complete the following steps:
(For complete instructions on specific FCS proce-
dures, please refer to the FCS online help facility.)
1. Install the V4W module and interface.
If the module and interface have not been
installed, do so now following the instructions
in the “Installation” section earlier in this
chapter.
When you first install the V4W module in a
live, unlocked chassis, 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.
This is the first acceptance test.
NOTE
Trunk conditioning options are only available
with the T1 MV5 and the V4W module (both A
& B channels). V2W, V2T, FXS & FXO modules
have fixed trunk conditioning (channel forced
idle for 2.5 sec. when busy) only.