Specifications

Page 7–8
FOCUS System Manual
module, it assumes the other module has been
pulled and does not issue an alarm.
LOCKED – This green LED, when lit, indicates
that the Maintenance Module (i.e., the chassis) is
locked. If the Maintenance Module, while locked,
loses communication with another module, it
issues a minor alarm.
FLIPPED – This red LED, when lit, indicates that
the chassis has flipped its channels over to the
alternate path (for systems with APM).
ARMED – This green LED, when lit, indicates
that the system is armed and ready to detect
failures for APM (for systems with APM).
RECEIVE – This green LED, when lit, indicates
that the module is receiving a PLOW call. This
means either that the person at another chassis in
the loop (with its PLOW also enabled) wants you
to pick up your phone or that the alert relay has
been activated.
SEND – This green LED, when lit, indicates that
the module is sending a PLOW call. It lights up
whenever you push the signaling button to alert
the person at another chassis in the loop (with its
PLOW also enabled) that you are trying to call via
the handset interface.
7.4.3 Carrier Group Alarm - T1/MV5
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.
STATUS LED
INJECT/EJECT
LEVER
SOLDER SIDE
RS-232 PORT
N
S
E
W
TX
RX
MASTER
SLAVE
Figure 7–5. Maintenance Module (MV4, MV5)
Main Board Status Indicators
SIGNALING
BUTTON
HANDSET
INTERFACE
SOLDER SIDE
PLOW BREAK
LOCK
SWTEST
UNLOCK
FLIPPED
RECV
SEND
ARMED
Figure 7–6. Maintenance Module (MV4, MV5)
Aux. Board Status Indicators