|
|
Cisco DVB CAR100 Memory
The cable modem software is stored in Flash memory, which contains two executable images of the system software. When the Cisco DVB CAR100 leaves the factory, Image 1and Image 2 are identical i.e. the original factory-installed software. The first time a software upgrade is performed, the new version is copied over Image 2 and this then becomes the active software version the next time the cable modem is rebooted. If a problem occurs during the software update, the Cisco DVB CAR100 will revert to the original factory-installed software until the new software can be downloaded successfully. For more information, see the "Performing a Software Upgrade" section. It is also possible to upgrade the fallback software version (i.e. Image 1). For more information, see "Upgrading the Fallback Image" section on page 4-12.
Performing a Cable Modem Software Recovery
The software recovery cannot be done from a remote site—it must be physically performed for each Cisco DVB CAR100. To prevent unauthorized cable modem configuration, the procedure is not described in the documentation received by subscribers.
Figure 6-1 shows the underside of the Cisco DVB CAR100 and the location of the software recovery button.
To recover the factory-installed software:
Step 2 Insert a suitable instrument (such as a paper clip) in the software recovery opening.
Step 3 Press and hold the software recovery.
Step 4 Connect the power cord again.
Step 5 Wait 5 seconds.
Step 6 Release the software recovery button.
If successful, the current fallback software image will now be activated again.
 |
Note Repeat this procedure during every power-on until a new software image has been successfully loaded to the Cisco DVB CAR100's Flash memory. |
 |
Tips To verify if you have been successful, check the version number displayed in the field rcm Software>Fallback version. |
General
The LED patterns used in the Cisco DVB CAR100 can be helpful for troubleshooting. If you are troubleshooting from a remote location, ask the subscriber to carefully observe the LED patterns and supply this information to you.
Activity LEDs
The Master LED is located on the front panel of the Cisco DVB CAR100. The cable modem's rear panel features two green LEDs: the Cable LED and the Ethernet LED.
Normal operation
The table below shows the LED pattern during normal operation.
LED | Description |
|---|---|
Master LED | Permanently ON (green) when a connection to the headend is established. |
Cable LED | BLINKS (green) when the cable interface is up. |
Ethernet LED | BLINKING (green) when the Ethernet interface is up. |
During Startup
During startup, the Master LED should blink (amber); the Cable LED should be ON (green) during the entire startup process.
|
Tips The following recommendation is only relevant for earlier hardware versions of the Cisco DVB CAR100 (i.e. those released prior to 200): If the Cisco DVB CAR100 is powered off, it should remain off for at least 10 minutes before being restarted. If the unit is powered on within 10 minutes, it is possible it will fail to reestablish communication with the service provider's headend unit. If this occurs, power the unit off again, and leave it off for at least 10 minutes. Then power on the Cisco DVB CAR100 again and communication with the service provider's headend unit should be reestablished as normal. |
Master LED Patterns
The Master LED should blink (amber) according to specific patterns during startup. These patterns are divided into four beats, during which the amber LED can be ON (=1) or OFF (=0).
The inactive pattern is 0000 (consistently OFF). The power up pattern is 1111 (constantly ON). After the power up, the cable modem will start blinking according to Table 6-2, as it goes through initialization, finds a valid frequency and signs on to the headend.
2. Searching frequencies and sign-on | 3. The cable modem has signed on and is sending a BOOTP request and waiting for a reply | |
|---|---|---|
0001 | 0011 | 01011 |
| 1 Typically, the pattern 0101 is not seen, as the BOOTP answer arrives in less than 1 second. |
Monitoring LEDs via Ethernet
The Cisco Cable DVB/DAVIC Management Program allows you to view the patterns for the Master and Cable LEDs when you are directly connected to the cable modem via an Ethernet interface. To see these patterns, open the System MIBs and look at the setting for LED State. Double-clicking on this MIB will provide a description of the seven possible values:
IP Address/Subnetmask with BOOTP Failure
When the BOOTP server is in the process of assigning an IP address to the Cisco DVB CAR100, the cable modem's Master LED blinks approximately two times per second. Typically, the cable modem receives a reply to its BOOTP request so fast, it is impossible to see the LED blinking.
If the cable modem does not receive a reply, it blinks for a few minutes as multiple BOOTP requests are sent and then boots again. The cable modem will continue booting and sending BOOTP requests until it receives an IP address.
The Master LED will turn green only after the Cisco DVB CAR100 has successfully completed these three phases.
Cisco has released two useful support applications that can freely downloaded from the following URL: http://www.cisco.com/cgi-bin/tablebuild.pl/car100
One allows users to manage and monitor upgrades of groups of Cisco DVB CAR100s. The other enables users to view a large variety of variables and statistics from specific Cisco DVB CAR100s.
Downloading these applications requires a Cisco software download account, which can be obtained by contacting your Cisco partner, distributor or reseller.
If the Master LED stays amber, and does not turn green, it indicates that one of the phases of initializing and sign-on has not been completed successfully. In this case, follow the instructions below:
Step 2 Reconnect the Cisco DVB CAR100 to the power adapter.
If the problem persists, check the headend. It is also possible the cable modem will need to be sent in for repair.
Posted: Fri Feb 16 06:38:02 PST 2001
All contents are Copyright © 1992--2001 Cisco Systems, Inc. All rights reserved.
Important Notices and Privacy Statement.