ESR series service routers.ESR-Series. User manual
Create a line with additional modem initialization parameters for the second ESR-21:
esr-21-2(config)# chat-script answer_test "ABORT 'BUSY' ABORT 'NO CARRIER' '' AT OK AT&F OK
ATM0L0 RING ATAr CONNECT ''"
esr-21-2(config)#
Enable the use of the modem initialization string:
esr-21-2(config)# interface serial 1/0/2
esr-21-2(config-serial)# dialer string 000 modem-script answer_test
esr-21-2(config-serial)# exit
esr-21-2(config)#
8.14.3 Adapter soldering schemes
RJ-45 <-->DB-25 pinout
RJ-45<--> RJ-45 pinout (rolled over cable)