Owner`s manual

MR4800E Owner’s Manual

5.1 Introduction

This chapter provides the information needed to identify and fix problems with the MR4800E.

Problems can be observed at the MR4800E front panel (LEDs), or the dedicated management

console's PC screen. In addition, problems can be found when performing the Diagnostic Tests,

documented in Chapter 8 of the MultiModemManager Owner’s Manual.

For specific MultiModem troubleshooting information, refer to the MultiModem Owner’s Manual

shipped with your MultiModem. For basic Windows messages, refer to your Windows documentation

or Help screens.

5.2 LED Indicators

The MR4800E front panel has the following indicators.

• MR4800E two-color LEDs (1-16)

• Ethernet status LEDs (1-4)

5.3 Front Panel Indicators

There are 16 two-color LEDs on the front panel of the MR4800E. The LEDs indicate the state of the

installed modem cards in each of the CC4800 rack's 16 slots. On power up the lights go through a

defined sequence of events before they act as status indicators for the modem cards. This sequence

is defined below:

1. The LEDs on the right side turn red and then turn green when the right SIMM passes it's

memory test.

2. The LEDs on the left side turn red and then turn green when the left SIMM passes it's

memory test.

3. The LEDs stay green for about five seconds while the flash boot code waits for a handshake

sequence on the diagnostic serial port.

4. If none is detected (this is normal unless the firmware is being updated through the

diagnostic port) the main controller code starts running and the LEDs are turned off.

5. The LEDs are turned on and off, one at a time, red and green.

6. All LEDs turn green while the system starts up.

7. When the system has started, the LEDs reflect the status of the modem cards.

After the system has started, each LED will be in the following state based on the status of the

modem card.

LED Color Modem Card Status

Off Card not installed

Green Card installed and all modems are communicating with the MR4800E

Red Card installed and none of the modems are communicating with the MR4800E

Flashing Red/Green Card installed and one or two modems are not communicating with the

MR4800E