CTI Products NCB/EM with External PSTN Modem - Manual (Page 51)

CTI Products, Inc. NCB-EM User Guide
Appendix E. Troubleshooting 45
Table E5
If the ACT LED (on local
NCB) . . .
REASON CORRECTIVE ACTION
Occasionally blinks on, then
off.
Normal operation indicating a message
packet has passed through the router
module of the NCB.
Go to next Table.
Does not illluminate when
“RSVC” button on remote
NCB is pressed.
1. LonWorks Service Pin message from
remote NCB is not reaching the remote
modem.
2. LonWorks Service Pin message from
remote NCB is not reaching the local
modem.
3. LonWorks Service Pin message from
remote NCB is not reaching the local
NCB.
4. LonWorks Service Pin message from
remote NCB is not passing through the
local router module.
1a. Verify that “ACT” and “ERR” LED’s
on remote NCB flash once. If not,
return remote unit for
evaluation/repair.
b. Verify that “CD” LED is illuminated
on the local and remote modems. (See
above)
c. Verify that “SD” LED briefly
illuminates on remote modem when
the “RSVC” button is pressed on
remote NCB.
d. If ‘1c’ is not ok, check serial cable
connection between remote NCB and
modem.
2. Verify that “RD” LED briefly
illuminates on local modem when the
“RSVC” button is pressed on remote
NCB.
3. Check serial cable connection between
the local NCB and modem.
4a. Place the remote router in Repeater
mode and verify that the local “ACT”
LED illuminates when “RSVC” button
on remote NCB is pressed.
b. If ‘4a’ is ok, re-commission the local
NCB router.
c. If ‘4a’ is not ok, swap either the local
or remote unit with a known-good-unit
to determine the faulty unit.
Does not illuminate when
local LonWorks nodes are
transmitting messages.
1. LonWorks message packets from local
nodes are not passing through the local
router module.
1a. Verify the connection between the
local LonWorks nodes and the local
NCB.
b. Place the local router in Repeater mode
and verify that its “ACT” LED
illuminates when local LonWorks
nodes are transmitting messages.
c. If ‘1b’ is ok, re-Commission the local
NCB.
d. If ‘1b’ is not ok, return the local NCB
unit for evaluation/repair.
Table E5 continued on next page
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