ADSL Line Splitters on SDSL Connections.

[Curiosityx]

Greetings, ive installed a Cisco 878 SDSL Router today, all is well except the response times are ~150 ms for outbound connections.

Ive running traceroutes back to the router from remote sites and the high response times occur between the ISP router and mine.

Ive had too use an ADSL splitter on the line but it trains without a problem, could this be a possible cause to the response times?

The relevant part of the config is below

!
!
controller DSL 0
mode atm
line-term cpe
line-mode 2-wire line-zero
dsl-mode shdsl symmetric annex B
line-rate auto
!
!
!
!
interface BRI0
no ip address
encapsulation hdlc
shutdown
isdn point-to-point-setup
!
interface ATM0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
no ip route-cache cef
ip route-cache flow
logging event atm pvc state
no atm ilmi-keepalive
!
interface ATM0.1 point-to-point
no ip unreachables
no ip proxy-arp
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface Vlan1
description Connected to ASA5505 Outside
ip address **.***.**.** 255.255.255.252
!
interface Dialer0
description Connected to Internet
ip address **.***.**.230 255.255.255.0
encapsulation ppp
dialer pool 1
dialer-group 2
ppp authentication chap callin
ppp chap hostname ********@***********
ppp chap password 7 *******************
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0


Any help would be appreciated as i haven't much experience with SDSL connections.

Regards

 

[tolien]

The ADSL filter shouldn't make much odds, provided the router's connected to the ADSL side - which is just a connection to the line with no filtering.

 

[pdw8]

What is the reason for the filter? SDSL lines have no voice so the filter has no purpose really.

With regards to the config it seems all ok, although why do you need a subinterface on the ATM interface?

Here is the config I use for our customers

!
controller DSL 0/2/0
mode atm
line-term cpe
line-mode auto
dsl-mode shdsl symmetric annex B
!
!
!
interface ATM0/2/0
no ip address
no atm ilmi-keepalive
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
!
interface Dialer0
mtu 1420
ip address **************
encapsulation ppp
ip tcp adjust-mss 1380
dialer pool 1
dialer-group 1
ppp authentication chap callin
ppp chap hostname **********@centrictelecom.broadband
ppp chap password ***********
!

This works fine for the dozens of SDSL lines I have configured.

Cheers,
Paul

 

[Curiosityx]

Cheers for that, ive had to use a filter because BT gave me an RJ11 phone socket for the line as such the nice purple cable that Cisco gave me wouldnt fit without the filter.

I use the sub interfaces to separate out the dialler groups should there be more than one, just carried on using the same to be honest.