I fill annoyed by the cable CAB-E1-PRI (if I am not wrong, this cable is used for ISDN connection. One end is a RJ-45 connector to plug into Telecom's CPE. The other end is a DB-15 connector to match the PRI port on my NM-1CE1B module of the 2621 router.)
My quetion is: what is the signal definition on the pins of the RJ-45 and the DB15 connectors? I found two documents in CISCO's web site about the RJ-45 connector. One said that pin 1 is for Receive Tip, and pin 2 for Receive ring, and pin 3 for Transimit Tip, and pin 4 for Tx ring. The other said that pin 1 is for Transmit tip, and pin 2 for Tx ring, and pin3 for Receive tip, and pin 4 for Rx ring. Which one is right?
By the way, what is the meaing of "ring" and "tip"? And what is the difference between E1 and ISDN PRI?