DO I need Both interfaces card to connect?

Hello Experts, below is my orig config on the T1 router and I am moving to another location, do I need both serial modual nad T1 csu/dsu to make it work?

nterface Serial0
 description PB CKT 23/HCGM/009284/PBI 1-800-463-8724
 no ip address
 encapsulation frame-relay IETF
 fair-queue
 service-module t1 timeslots 1-24
 frame-relay lmi-type ansi
!
interface Serial0.1 point-to-point
 ip address x.x.x.x 255.255.255.252
 frame-relay interface-dlci 16  
!
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0.1
no ip http server
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tomcattyyAsked:
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mikebernhardtCommented:
If it's going to remain frame relay, then what you have should be fine- except that the dlci on the subinterface will likely change- that's a local identifier provided by the telco. And of course the circuit ID will need to change in the description. But you will need all of what you've provided..
tomcattyyAuthor Commented:
Thanks for fast response, actually the existinig router will not move and we are purchasing another cisco 2621 router. My question is since the ISP tell us they will provide the same service for new location do I need to peuchase a serial module besides a T1 module. Why is that some T1 connection need just a T1 connection module and this T1 service different? Thanks.
mikebernhardtCommented:
It's only one module- the T1 module you have has a built-in CSU/DSU. Because it's frame relay it configures differently- the subinterface configuration is for the frame relay PVC, it's not hardware related. If you want to use an external CSU/DSU you can use a different card but the only line in your config that goes away is the service-module line.
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tomcattyyAuthor Commented:
Thanks, it's more clear now.  Since it's a frame relay so I will definitely need a serial interface module. Is that means a Fram relay can also go through a T1 connection? Thanks.
mikebernhardtCommented:
Yep. Frame Relay is a data encapsulation type that is used across a T1. HDLC and PPP are other encapsulation types.
tomcattyyAuthor Commented:
Thanks and final question is it true if the ISP utilize HDLC or PPP for encapsulation then no serial module would be necessary for connection. Or most can change the encapsulation method according your hardware capacity? thanks again.
mikebernhardtCommented:
No, you still need a serial module. No matter the encapsulation type it's still a T1 and it needs a module that can work with it. As far as the ISP changing the encapsulation I would think they could move between HDLC (Cisco-proprietary but very common) and PPP because they're both point-to-point. Frame Relay is a different type of service altogether even though it runs across a T1.

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tomcattyyAuthor Commented:
Thank you for all the information.
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