Frame relay switch problems (using WIC T1) 1

[dgrizzard]

I'm setting up a lab and I've got 2 1720s with T1 WICs and 1 1760 (FR switch) with 2 T1 WICs. I've made the T1 crossover cables and have everything connected and configured. The issue is everything is down/down and I'm stumped as to why. Any help would be appreciated.

1720 Router:

interface Serial0
 no ip address
 encapsulation frame-relay
 service-module t1 clock source internal
 service-module t1 timeslots 1-24
 frame-relay lmi-type ansi
!
interface Serial0.1 point-to-point
 ip address 172.16.101.220 255.255.255.0
 frame-relay interface-dlci 221

1760 Router (FR Switch):

frame-relay switching
!
!
!
!
interface FastEthernet0/0
 no ip address
 speed auto
!
interface Serial0/0
 no ip address
 encapsulation frame-relay
 no fair-queue
 no frame-relay inverse-arp
 frame-relay intf-type dce
 frame-relay route 122 interface Serial1/0 221
!
interface Serial1/0
 no ip address
 encapsulation frame-relay
 service-module t1 clock source internal
 service-module t1 timeslots 1-24
 frame-relay lmi-type ansi
 frame-relay intf-type dce
 frame-relay route 221 interface Serial0/0 122
!

Note: Serial1/0 on the 1760 is the only one currently in use with the 1 1720 router. Testing everything out right now before I configure the other 1720.

 

[jneiberger]

If it is down/down then you have a physical layer problem. Does the 1760 have a DSU WIC int slot 0/0 or do you have an external CSU/DSU? Also, if you're going to set the LMI type to ANSI on one side, you should set it to that on the other side. Why are you doing that, anyway?

You might also want to verify that your cables are properly pinned out and well-crimped if you made them yourself.

 

[jneiberger]

Oops, misread your post. You're connected to S1/0 on the 1760, not 0/0. Nevermind about that part.

Your clocking is misconfigured. You want one side to be set to internal, the other side to line. They can drift out of sync if both are set to internal. You want to create a sort of master/slave relationship with your clocking.

 

[dgrizzard]

I corrected the clocking (just copied and pasted before)... and I re-crimped the cable based on the following website's pin out...

http://www.ldfacts.com/faq_files/How-to-Make-a-T1-Crossover-cable.htm

I still show down/down...they both are WIC T1 CSU/DSU...and I've tried different cards.

 

[jneiberger]

You definitely still have a physical layer problem. I know you already have the link, but just triple-check that your crossover cable is like this:

1 -> 4
2 -> 5
4 -> 1
5 -> 2

You might also want to try a different WIC module just to eliminate that as a potential problem.

 

[dgrizzard]

<-- Stupid

After pulling my hair out for so long...I was reading the jack upside down... instead of 1,2 I was wiring 7,8. Working fine now, thanks for pointing me in the right direction.

 

[jneiberger]

No problem! I'm glad you figured it out.