Chapter 6 Troubleshooting the VG248
Troubleshooting Hardware Errors
6-4
Cisco VG248 Analog Phone Gateway Software Configuration Guide
OL-1209-02
Connecting Too Many Phones to the VG248
The VG248 has a maximum ringer equivalency number (REN) load of three (3)
analog devices per line (using a shared directory number), and only two of these
devices can be off-hook at any one time. If these requirements are ignored, you
might experience reduced quality on these analog phones, including:
• Difficulty hearing caller—Users have too many phones off-hook. Do not
have more than two phones per line off-hook simultaneously.
• Dialing or caller ID are not working properly—Users have too many phones
off-hook. Do not have more than two phones per line off-hook
simultaneously.
• Phones not ringing properly or at all—REN load has been exceeded. Do not
connect more than three analog devices per line.
• Phone power supplies (-48v and -96v) fail—REN load has been exceeded. Do
not connect more than three analog devices per line. See the “Identifying
Power Supply Faults” section on page 6-3 for additional information.
Resolving Additional Hardware Errors
Table 6-1 describes errors and warnings that might appear on the VG248 either
on-screen or in the event log (see the “Working with the Event Log” section on
page 6-22 for details on accessing the event log) which are caused by a hardware
fault. Use this information to resolve these errors.
Table 6-1 Hardware Errors and Warnings Explanation
System Error Explanation Action
DSP DSP X on SIM Y has
failed
One of the Digital Signal
Processor (DSP) chips
inside the VG248 has failed.
Contact a Cisco technical
representative for assistance.
DSP DSP X, SIM Y
failed to boot
OS Ethernet has gone
down
Ethernet has gone down at
the physical level.
Verify that the Ethernet cable is
properly connected to the VG248 and
that the hub or switch to which it is
connected is up and running
properly.
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