| Author |
Setting up a DDS Circuit problems
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| btroadman 2004-04-27, 8:49 am |
| We recently ordered a 56k DDS circuit to connect a location up, they are way out in BFE, no other alternatives unfortunately. I tried to use Cisco 1602 routers we had laying around with the built in 56k wic's. I used a basic Frame-relay config with these commands...
R1 - service-module 56k clock source line
R2 - service-module 56k clock source internal
service-module 56k network type dds
I could not get them past the status up protocol down. I can't find much about these old DDS circuits out there. I thought I had my configuration right. Can anybody offer any more information? I appreciate it. | |
| Holiday72 2004-05-03, 10:54 am |
| If the 56k circuit is being provided by a service provider, US West, Bellsouth etc, the provider provides the clock source. So your R2 should be recieving clock from the line as well. That's the only thing I can see as far as the config that you have listed. The only time you'd need to provide clock from the router is if you laid your own line. Other than that it could be signal strength as well, if they're way out in BFE, you could be having signal dampening from the distances, they need to send a tech out to read the signal strength on the line and may have to boost the LBO from the switch. | |
| Holiday72 2004-05-03, 10:59 am |
| oh and one other thing on the frame relay config, if the 56k service is a traditional service and not a frame service provisioning you have to configure one of the user interfaces as a Network Side of a UNI, LMI on the interface is automatically the User Side and looks for a response from the Network for status. THis usually requires a router set up as a frame relay switch, or you could try a external CSU/DSU like the Paradyne's FrameSaver and it will perform the frame relay micro switch function for you | |
| btroadman 2004-05-03, 11:00 am |
| I tried them both internal the day I was out there, same difference. I tried every thing I could with no luck. I called in a trouble ticket for them to test the line and they said it came back fine. Thanks for your reply. I appreciate the info. | |
| Holiday72 2004-05-03, 11:05 am |
| Both clock sources should be set to line, not internal | |
| btroadman 2004-05-03, 11:05 am |
| It was explained to me that with this circuit I could just use the
'service-module 56k network type dds'
And it would work in back to back mode and there would be no need for a frame-relay switch. | |
| btroadman 2004-05-03, 11:11 am |
| That's what I meant....line, sorry. | |
| Holiday72 2004-05-03, 11:12 am |
| 'service-module 56k network type dds'
Is a physical layer command and will allow for back to back mode operation at the physical layer, however, LMI and Frame are layer 2 protocol and encapsulation respectively so you'll have to have UNI properly set up for frame communication. | |
| Holiday72 2004-05-03, 11:17 am |
| You should try using HDLC first to see if you can get communication to come up across the wire.
that should get you up and running, but with frame you have to have that LMI polling and sequencing across the UNI to have connectivity and have protocol up status. | |
| btroadman 2004-05-03, 11:21 am |
| It's funny that you say that about HDLC. Because after about 4 hours of no luck with this stupid circuit, I started from scratch and tried HDLC as a final effort with the same results....which would be nothing. | |
| Holiday72 2004-05-03, 11:25 am |
| something smells of fish in this pond.. lol! | |
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