3Com Nbx 100 And Ss3 Nbx Administration Guide

System-level Troubleshooting401
System-level 
TroubleshootingFor each symptom listed in Table 73, perform the suggested actions in the 
order listed.
WARNING:Before you remove any component, shut down THE system 
software and then turn off the power to the chassis by removing the 
chassis power cord. If the system has two power supplies, remove both 
power cords.
Table 73   Troubleshooting Actions
SymptomPossible CauseSuggested Action
Date/time display 
on telephones is 
wrong, either 
incorrect date or...

402CHAPTER 10: TROUBLESHOOTING
 Invalid IP 
configurationThe system has a default IP configuration 
which might need to be changed to 
match your local IP environment. 
Temporarily change the IP configuration 
of your computer so that the subnet 
configuration matches the system 
configuration. Specify 255.255.255.0 as 
the subnet and use IP address 
192.168.1.191. After you change your 
computer’s IP configuration, connect to 
the system and change its IP configuration 
to match the IP environment of...

System-level Troubleshooting403
The NBX NetSet 
utility is very 
slow in 
responding. Your network uses a 
proxy server for 
Internet access.A common networking practice is to 
employ a proxy server to shield your 
network from intrusion by unauthorized 
users. However, communications with the 
NBX NetSet utility do not need to pass 
through the proxy server. To speed access 
to the NBX NetSet utility, configure your 
browser to access the NBX system without 
going through the proxy server. 
All...

404CHAPTER 10: TROUBLESHOOTING
Digital Line Card
TroubleshootingIn order to correctly troubleshoot a Digital Line Card, you must determine 
whether the origin of the problem is:
■The hardware
■The software configuration
■The CSU (Channel Service Unit)
■The telephone company’s line
To eliminate the Digital Line Card (T1 or E1) attach a loop back connector 
in place of the telephone company’s line. Configure the card as described 
in the appropriate section of Chapter 3
.
After you complete the...

System-level Troubleshooting405
Alarm Descriptions Red Alarm
■Carrier Fail Alarm (Red CFA) — A state that exists at a downstream 
terminal device, based upon the terminal device detecting an 
incoming LOS or LOF.
Blue Alarms
■AIS, Keep-alive/Blue — A signal that is transmitted instead of the 
normal signal to maintain transmission continuity and to indicate to 
the receiving equipment that there is a transmission interruption either 
at the equipment that is generating the AIS signal or upstream of that...

406CHAPTER 10: TROUBLESHOOTING
Alarms on NBX
Digital Line CardsThe T1 and E1 Digital Line Cards support all of the alarm states and 
signals described in “Alarm Descriptions”
 earlier in this chapter. Two 
status lights indicate the status of the T1 and E1 cards:
Table 74   Digital Line Card Status Lights
Status LightPurpose
NominalOn: Indicates that there are no error or alarm conditions.
Flashing: Indicates that a call is active on at least one channel 
of the T1 or E1 Digital Line Card.
CF (Carrier...

System-level Troubleshooting407
Configuration and
Status ReportsYou can obtain the status of all Digital Line Cards in the NBX system with 
either of these two methods:
Select the Digital Line Cards tab and:
■Click Config & Status Report. The formatted report appears on the 
screen with headings shown in a larger font.
■Click Export Report. The unformatted report appears on the screen. To 
save the report as an ASCII text file, select Save as from the File menu 
of your browser.
Ta b l e 7 5
 describes...

408CHAPTER 10: TROUBLESHOOTING
ChIdUnique identifying number of a channel in a list of channels, 
possibly including channels from more than one board.
ChNoChannel number. For example: 1–24 for a T1 board.
CurStateCurrent state of a channel (in use, idle, available).
DNIS/DIDNumber of digits passed that identify the called party.
DSP NameName of a digital signal processor.
DSP StatusStatus of a digital signal processor.
DSP VersionVersion of code running on a digital signal processor.
Digit...

System-level Troubleshooting409
NCP ConneThe amount of time that the digital line card waits for the NCP 
to connect the call. “USER_ALERTING_NO_ANSWER” errors 
mean that this value may be too small.
NCP GenerA timeout value that controls how long the digital line card waits 
for a response from the call processor. Do not modify this value.
Network DigitA timeout value that controls how long the digital line card waits 
between digits sent on an incoming call.
OffHk MinThe minimum time an analog...

410CHAPTER 10: TROUBLESHOOTING
Connecting a 
Computer to a 
Serial PortOn the SuperStack 3 Call Processor, the NBX 100 Call Processor, and on 
some of the NBX cards, you can connect a computer to a serial port and, 
by running a terminal emulation program on the computer, you can 
obtain information about the status of the card or the NBX system.
You can connect a computer directly to the serial port on these cards:
It does not matter which computer operating system you use. As long as 
the computer has...