Specifications

Page 5–6
FOCUS System Manual
• Bad T1/E1 status
• Receiving a bad XID (the source or desti-
nation address contained in the XID
message does not match user configured
addresses)
• XID time-out (failed to receive an XID
message within the last 90 milliseconds)
If a failure is detected, the loop will go into
Alternate Path Mode. DS0 Channel assignments
MAY or MAY NOT actually be re-routed. For
example, in the following scenario (Figure 5-1), if
a break occurs between nodes 706 and 750 and no
channel assignments were made to 706 West or
750 East, the loop would still go into Alternate
Path Mode and the following would occur:
• APM Status of Node 750 will be DOWN,
FLIPPED LED will be ON. Target “APM
Loop 1 Going to DOWN state: Reason: T1
Bad, Fail Direction: XCVR1-1.” will be
logged.
• APM Status of Node 706 will be DOWN,
FLIPPED LED will be ON. Target “APM
Loop 1 Going to DOWN state: Reason: T1
Status
INACTIVE
READY FOR ARM
MAINTENANCE,
FLIPPED, DOWN
or ARMED
SETTING XIDs
User Action
Select the correct loop definition
Verify the loop definition and neighbors
addresses.
The loop may be manually ARMed. This is the
NORMAL procedure if an adjacent module was
not ARMed. Perform the FCS “APM Arm”
command. NOTE: If the arm command is NOT
successful, all nodes will be disarmed, and
primary path is restored. If this occurs, you
should immediately request the Target buffer,
where the Reason and Address of the failed
node is recorded.
Contact AMETEK. The LED may be burnt out.
The APM Status command should be sent
again. If this same status is returned three
times, something is wrong. Contact AMETEK.
Reason(s) Automatic ARMing Did NOT
Succeed
The loop definition or a neighbor’s address is
not valid. A loop definition will cause the
INACTIVE state if the transceivers are not
present for a defined loop. The neighbor’s
address must be the value obtained from the
FOCUS chassis via the FCS “Get Terminal
Identification Number” command.
One of the neighbor addresses is not correct.
The Source Addresses contained in the XID
messages received must be equal to the user
configured neighbor addresses programmed in
the newly inserted maintenance module.
One of the adjacent nodes of the loop defini-
tion is not currently ARMed. (in states ARMED,
MAINTENANCE, DOWN or FLIPPED). For a
node to automatically ARM, both adjacent
nodes must be ARMed.
The loop is ARMed and the APM Status LED
should be ON. NOTE: In the second release of
APM, when you may define two loops if one
loop is ARMED and the other loop is NOT
ARMED but in the “READY FOR ARM” state,
the status LED will NOT be ON.
The automatic ARMing sequence is in process.
Table 5–3. APM Troubleshooting.