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HWIC-Cable-D-2 Which serial number sent to CMTS?

I am trying to get my HWIC-Cable-D-2 going with my ISP.  It syncs up fine, but remains unauthorized.  The ISP validates the serial number of "the modem", but I need to know which serial number to send them.

From what I see, there are 3 possibilities:

Router Chassis serial number (not likely)

HWIC card serial number (show inventory)

CM daughter card serial number (only available through show diag)

Which is it?

And befor you ask, my ISP is a pain and I can't just cycle through it with them to find the right one.

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HWIC-Cable-D-2 Which serial number sent to CMTS?

I am using a cisco 1841 with IOS 15.1(4) with all the commands I have displayed here:

when you do a

show int cable-modem 0/0/0

I have removed the actual mac address form this device and replaced it with "x". As you can see from this out put you have both a HFC MAC and a hardware mac for the hwic-cable-d-2. Bye the way HFC is short for Hybird fiber coaxial--might want to do a little reading on this. Anyway, back on track here, the HFC MAC address or serial number is what most cable isps require to register the device on their network. This is a spare hwic-cable-d-2 that I keep in the event my 1841 v05 go's down that is why all the lines are showing down.

So call your isp back provide them with the HFC MAC address so they can register the device on their network. Here is a link to ciscos offical page for the HWIC-cable-d-2 at the end of the PDF Book you can download on this page ( link for PDF is on right side of screen) are a number of very good troubleshooting tools that might help with your sitiuatuion. Good luck and the link you need:

This is the output you should receive when the hwic-cable-d-2 is down.

Router#show int c0/0/0

Cable-Modem0/0/0 is administratively down, line protocol is down

HFC state is NOT_SYNCHRONIZED, HFC MAC address is xxxx.xxxx.xxxx ( required by cable isp providers)

Hardware is Cable modem, address is xxxx.xxxx.xxxx (bia xxxx.xxxx.xxxx)

MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec,

     reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive not supported

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

HFC input: 0 errors, 0 discards, 0 unknown protocols 0 flow control discards

HFC output: 0 errors, 0 discards

     0 packets input, 0 bytes, 0 no buffer

     Received 0 broadcasts (0 IP multicasts)

     0 runts, 0 giants, 1 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 input packets with dribble condition detected

     0 packets output, 0 bytes, 0 underruns

     0 output errors, 0 collisions, 1 interface resets

     0 unknown protocol drops

   0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out


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