Comtech EF Data CIC-50 - Manual (Page 16)

. CIC-50 T1/E1 G.703 Interface Converter
4 Rev. 1
3.1.2 AMI or HDB3/B8ZS
For both T1 and E1 formats, this sets the G.703 output to either the uncoded Alternate
Mark Invert (AMI) format, or to the appropriate zero substitution line code used for T1
(B8ZS) or E1 (HDB3).
3.1.3 E1 BAL or UNBAL
For E1 only, this adjusts the impedance on the G.703 input between 120 ohms for
balanced and 75 ohms for unbalanced. The 15-pin D-sub connector should be used for
balanced and the two BNC connectors for unbalanced. For T1 this selection is a ‘don’t
care’ since unbalanced is not an option, and the D-sub connector must always be used.
3.1.4 T1/E1 BALANCED 15 PIN D-SUB PINOUT
Pin Balanced G.703 Tx (Inputs)
3, 11 Balanced G.703 Rx (Outputs)
2, 4 Ground
6, 7, 8, 14, 15 Don’t Connect (reserved for redundancy system)