Paradyne 336x E1 manual DTE Interface, Table D-2 DTE Connector 120 Ohm Signal Pin Number

ACCULINK 336x E1 NTU

G.703 DTE Interface

The G.703 DTE interface is either two BNC connectors (Transmit and Receive) for a 75 ohm unbalanced interface, or a DB15-type socket connector (Table D-2) for a 120 ohm balanced interface. For information about using Relay Contact Sense for external DTE loopback, refer to the Extrn DLB configuration option in the DTE Interface Configuration Options section of Appendix C.

The G.703 DTE cable (Figure D-1) is typically supplied by a DTE vendor. It is made of shielded twisted-pair wires (22 AWG). The cable connector is a DB15 plug. Be sure to connect the shield ground only at the E1 NTU end to prevent ground loops.

Table D-2

G.703 DTE Connector (120 Ohm)

Signal	Pin Number
Receiver Tip from DTE	1
Receiver Ring from DTE	9
Transmitter Tip to DTE	3
Transmitter Ring to DTE	11
Relay Contact Sense Return	12
Relay Contact Sense	14
Shield Ground	2, 4

Figure D-1. G.703 DTE Cable

D-2 December 1996 3360-A2-GB20-20