Maximizing Modem speed with NM-8AM Analog Modem Module.

sunil.kandam · ‎06-06-2007

HI All,

I have configured 3845 router remote and main location with Analog back line. I am getting only 34kbps speed with analog connection.

Anybody can help me how I can make it 56kbps.

Following are Dialin side configration.

interface Dialer1

description Analog Backup with 8Modems

ip address x.x.x.x

encapsulation ppp

no ip mroute-cache

dialer pool 1

dialer string x1

dialer string x2

dialer string x3

dialer string x4

dialer string x5

dialer string x6

dialer string x7

dialer string x8

dialer string x3

dialer load-threshold 1 outbound

dialer max-call 8

dialer-group 1

fair-queue 64 512 3

no cdp enable

ppp authentication chap

ppp chap hostname PSTN

ppp chap password 7 xxx

ppp multilink

ppp multilink links minimum 8

ppp multilink interleave

dgahm · ‎06-06-2007

You would need to use a digital modem module, and terminate the calls on either a BRI or PRI interface to achieve 56kb speeds. Analog modems to analog modem calls cannot achieve 56kb. One side of the call has to be digital.

http://www.cisco.com/en/US/products/hw/routers/ps274/products_tech_note09186a00800ad45b.shtml

56 Kbps (V.90) can be achieved when the peer is a digital modem (for example, a AS5xxx with a digital circuit such as a T1 or E1 line)

56 Kbps (V.90) cannot be achieved when connecting to an analog modem. This is a limitation of V.90 technology and is not a hardware issue. Refer to Overview of General Modem and NAS Line Quality for further information.

http://www.cisco.com/en/US/products/hw/routers/ps274/prod_brochure09186a0080091b99.html

Please rate helpful posts.

Dave

sunil.kandam · ‎06-07-2007

Hi David,

Thank you very much for your reply.

Sunil KC