PictureTel Concorde 4500, Administrator'S Manual

Page: 195 / 250

Troubleshooting Procedures
8-9
No Channel
Connection
Network Not Ready
Internal
CSU, dialed There may be a
problem in the
electronics
module.
Network Not
Ready
may
indicate a
problem with
the network or
with the cables.
1. Make sure that all network
connections to the electronics
module are securely attached.
2. Check the LEDs on the back of the
Communications board and make
sure that the DTR and DCD LEDs
for both ports are lighted and that
all other LEDs are out, as for a
normal idle condition.
❑
If the NS LED is on for either
or both ports, this indicates
that the CSUs are not seeing
- 48 volts on the receive pair.
Continue with step 3.
❑
If the LEDs are in normal idle
condition, call the network
provider.
3. Pull the network connection block
off the wall, and check pins 7 and
8 of RJ-48S with respect to earth
ground for - 48 volts.
❑
If the check fails, check the
wiring to the block and, if it
cannot be repaired, call the
network provider.
❑
If the check is successful, call
the network provider.
If you complete these checks and are
unsuccessful in communicating
with the far end, call your
authorized PictureTel service
provider.
Table 8-5: Network or Communications Failure Checklist (Continued)
Message that
appears on the
PictureTel
screen
Type of
network
interface
It means... Do this...