Multitech CC4800 Owner's Manual download pdf (Page 57)

Chapter 5 - Troubleshooting

5.4 Ethernet Status LEDs

The MR4800E front panel contains four Ethernet status LEDs. Each LED is described below.

LED Color Status

Link Integrity (LI) yellow on during good link

Collision Sense (CS) red on when there's a collision on Ethernet

Transmit (TX) green on during Ethernet transmit

Receive (RX) green on during Ethernet receive

5.5 MR4800E Diagnostic Tests

If you suspect that your MR4800E is not functioning properly, you may run the following diagnostic

tests to test the MR4800E's hardware capabilities.

1. Put test jumper (refer to page 2-1 of the owners manual to locate the test jumper on the

controller card) into loopback position (so the two pins are shorted together). Plug the

10base-T loopback jumper into the front Ethernet connector of the MR4800E card.

2. Use MultiExpress (or any data comm package) running at 115,200 with no flow control.

Connect the COM Port associated with the data comm package to the RS-232 port on the

back of the CC4800 rack.

3. Reset the MR4800E by pressing the reset button on the front with a paper clip or power the

CC4800 rack off and on.

4. When prompted to start manually, press a key.

5. You will be prompted to enter a username and password. Login as supervisor.

6. Type in the command HDTEST and press Enter.

7. You will see a menu. Proceed with testing in the following order:

WARNING: Running options either out of order or ones not specified may cause

unpredictable results.

Test 2 Red LED’s on

Test 3 Green LED’s on

Test 4 All LED’s off

Test 5 Flash memory test

Test 7 Ethernet loopback test

Watch for the green Ethernet LED on left side of the Ethernet connector, it should be on

solid. Numbers stopped and packets received will match.

Test 1 Start backplane LED’s on the front of the MR4800E will reflect the

number of cards installed.

Test a Sets slot 1 modems to 9600 bps

Test b Sets slot 1 modems OOS

Test c Clears slot 1 modems OOS

Test d Resets slot 1 modems

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Multitech CC4800 Owner's Manual Page 57