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Cable Diagram Pin AssignmentsPassport 4400 Hardware Installation Manual
A-18
Figure A-15. 120 ohm Crossover Cable
Twisted
Pair
Twisted
Pair
To E1
Voice Module
To PBX
or PSTN
DB-9 Connector
(Male)
DB-15 Connector
(Male)
Tip 1 (T1) 1 2 Tip (T)
Ring 1 (R1) 6 9 Ring (R)
Tip (T) 3 4 Tip 1 (T1)
Ring (R) 8 11 Ring 1 (R1)