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channelized T1 point to point

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6 replies

by techpro 1 view

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i have two AS5200 (using them as routers) hooked up to a channelized T1 each. i'm trying to set up a ~1.5mbps link between them.

what happens is, i have the link up (all 23 channels in a bundle). there are no errors (dropped packets, etc) on interface se0:23 or dialer1. there are a few "line code violations" on SOME (not all) channels (as seen when doing show controller t1 0)

my problem is mostly that i can't get any kind of decent performance (200-400 kbits instead of ~1.5Mbis)

in case it would help here's the config i use (similar on both routers):

controller T1 0
framing esf
clock source line primary
linecode b8zs
pri-group timeslots 1-24
!
interface Serial0:23
no ip address
encapsulation ppp
dialer rotary-group 1
isdn switch-type primary-5ess
no fair-queue
no cdp enable
ppp multilink
!
interface Dialer1
ip unnumbered Ethernet0
encapsulation ppp
no ip mroute-cache
dialer in-band
dialer idle-timeout 0
dialer fast-idle 15000
dialermap ip 1.2.3.4 name cisco5-7 broadcast ##########
dialer load-threshold 1 either
dialer-group 1
no peer default ip address
no fair-queue
no cdp enable
ppp multilink
ppp multilink interleave
!
dialer-list 1 protocol ip permit

1.2.3.4 is the ip of the remote router
########## is the phone number
(removed for privacy converns.. as you can imagine)

6 replies

by acattr

Just in case, are you getting Megabits and Megabytes confused?

1.5Megabit(1536Kilobit) T1 line outputs 0.1875 Megabytes(192kilobytes)

by techpro

no, im really talking about kiloBITS. i got it up to around 800 kbits/s (100 kbytes) by tweaking the configs some, but the ping is seriously unstable (average 600)

by bigfoot

If this is a point-to-point connection you will need to set up one end for a clock source of line and the other clock source as internal. If one of the AS has an telco T1 connected to it, that end should be the one set to internal.

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