CANOGA PERKINS 2461 E1 Modem - Manual (Page 51)

EdgeAccess Universal Chassis System
2461 Modem User Manual 6-1
6 Chapter 6
Troubleshooting
Troubleshooting can be a very simple task if discrete logical steps are taken. This chapter
addresses potential problems and how to take corrective action. The front panel LEDs display the
majority of fault conditions. These and other conditions also appear in System Alarms screen,
Hardware Configuration screen and Functional Configuration screen.
To facilitate troubleshooting, some of the LEDs functionality are again described here. Front
panel LEDs are multifunction LEDs. All LEDs, with the exception of STA and SQL, have the
function of:
• Solid ON means the error condition is in the local modem
• Steady blinking ON (1 sec. rate) means that the error condition is in the remote
modem
In order to simplify this section we will not differentiate between solid ON or blinking ON.
Therefore, once the problem is identified, the user shall take corrective action at the local or
remote modem depending on whether the LED is solid On or blinking.
6.1 New Installations
On new installations, it is very important to make sure that the installation has been completed.
After complete installation make sure that all LEDs are OFF except for STA and SQL (they
should be Green). If this is not correct, please ascertain the following and make corrections as
required before proceeding further.
1. Make sure that all fiber cabling is of the same type (do not mix multimode and single mode).
2. Fiber optic cable is within specifications and loss budget of the optic interface module.
3. Make sure that the Line length between the 2461 modem and the connecting equipment is not
more than 655 feet. Also, verify that the ELIMs are configured for the actual length.
4. All modems in the link are powered on.
5. Fiber cables properly connected. Tx connected to Rx and vice versa
6. In a redundant stand alone modem configuration, verify that the Primary reference on the
modem interconnect cable is connected to the Primary modem. In a chassis the Primary
modem should be in an odd number slot and its redundant modem in the adjacent (to the
right) even-numbered slot.
7. Confirm that the ELIM is plugged into the top slot and the OLIM into the bottom slot of the
modem.
8. If the remote unit is a stand alone, make sure that the front panel loopback switch is in the
OFF position.