To verify the cooling fan is still operational, power cycle NetClock unit (if AC and DC power
are both applied, momentarily turn off the AC power switch and disconnect the DC power con
nector).
Note: If the internal temperature in the unit is below 30 degrees Celsius, the fan
may not turn on as part of the power-up sequence. In this case, it is recommended
to let the unit “warm up” for approximately 30 minutes, in order to allow the unit
to get to the appropriate temperature.
See also: "Temperature Management" on page288
5.1.12 Troubleshooting – Network PCs Cannot Sync
In order for clients on the network to be able to sync to NetClock, several requirements must be
met:
1.1.
The PC(s) must be routable to NetClock. Make sure you can access NetClock Web UI
from a PC that is not syncing. If the PC cannot access the Web UI, a network issue likely
exists. Verify the network configuration.
2.
The network clients have to be configured to synchronize to NetClock's address. For
additional information on syncing Windows PC's, see
http://support.spectracom.com/articles/How_To/Synchronizing-Windows-
Computers. The last section of this document also contains troubleshooting assistance
for Windows synchronization. For UNIX/Linux computer synchronization, please visit
http://www.ntp.org/.
3.
If at least one PC can sync to NetClock, the issue is likely not with NetClock itself. The
only NetClock configurations that can prevent certain PCs from syncing to the time server
are the NTP Access table and MD5 authentication. See "Configuring NTP Symmetric
Keys" on page118. A network or PC issue likely exists. A firewall may be blocking Port
123 (NTP traffic), for example.
4.
NTP in NetClock must be “in sync” and at a higher Stratum level than Stratum15 (such
as Stratum1 or2, for example). This requires NetClock to be either synced to its input
references or in Holdover mode. Verify the current NTP stratum level and the sync status.
5.1.13 Troubleshooting Software Update
When experiencing slow data transmission rates, or other network issues, it may be possible
that a system software update will be aborted due to a web server timeout during the transfer.
334 NetClock User Reference Guide
APPENDIX
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