To emulate a PSTN router, we need a back to back E1 connection and the obviously the first step would be the cable connecting both routers. Here, the idea is to connect HQ Router with PSTN router and therefore the crossover cable needs to be made.
Following should be the PIN Configuration; RJ-48 Connector to RJ-48 Connector (Crossover) Pinout:
1 RX Ring - -> 4 TX Ring -
2 RX Tip + -> 5 TX Tip +
4 TX Ring - -> 1 RX Ring -
5 TX Tip + -> 2 RX Tip +
When connected, both 1MFT-E1 cards have immediatly turned on the "CD" Carrier Detect light,
The basic configuration to emulate a PSTN Pri will be:
PSTN_RTR#
network-clock-participate wic 0
controller E1 0/0/0
clock source internal ---- the "pstn network" side must provide clock
pri-group timeslots 1-31
interface Serial0/0/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn protocol-emulate network ---- this is the PSTN-emulated side ‘Service Provider’
isdn incoming-voice voice
no cdp enable
HQ_RTR#
network-clock-participate wic 0
controller E1 1/0/0
pri-group timeslots 1-31
interface Serial1/0/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn incoming-voice voice
no cdp enable
!
Reference: http://www.juniper.net/techpubs/hardware/m40/m40-hwguide/html/pinout4.html
http://www.techexams.net/forums/ccvp/31284-back-back-pri-am-i-missing-something.html
http://ccvp.org/modules/newbb/viewtopic.php?topic_id=63&forum=19
http://rizzitech.blogspot.com/2009/02/wvic-1mft-e1-back-to-back-connection.html
1 comment:
Thanks for such amazing extract. this config work well in my home lab. just a tiny correction, i use RJ 45 connector to make PRI (12,45)Cable. Name it Crossover is a bit wrong, i think.
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