14
DSX Port/Interface

Function Circuit Pin #

Receive tip from the DTE T1 1
Receive ring from the DTE R1 9
Transmit tip to the DTE T 3
Transmit ring to the DTE R11
Shield – 2,4
DTE Ports/Interfaces

Signal Circuit

Mnemonic ITU/

CCITT # Direction 25-Pin

Pin #

Shield — — — 1
Transmitted Data (TXD) BA 103 To DCE 2 (A)
14 (B)
Received Data (RXD) BB 104 From DCE 3 (A)
16 (B)
Request to Send (RTS) CA 105 To DCE 4 (A)
19 (B)
Clear to Send (CTS) CB 106 From DCE 5 (A)
13 (B)
Data Set (or DCE) Ready
(DSR) CC 107 From DCE 6
Signal Ground/Common (SG) AB 102A — 7
Received Line Signal Detector
(RLSD or LSD) CF 109 From DCE 8 (A)
10 (B)
Transmit Signal Element
Timing (TXC – DTE Source) DA 113 To DCE 11 (B)
24 (A)
Transmitter Signal Element
Timing (TXC – DCE Source) DB 114 From DCE 12 (B)
15 (A)
Receiver Signal Element
Timing (RXC – DCE Source) DD 11 5 From DCE 17 (A)
9 (B)
Local Loopback (LL) LL 141 To DCE 18
Data Terminal (or DTE)
Ready (DTR) CD 108/1, /2 To DCE 20
Remote Loopback (RL) RL 140 To DCE 21
Signal Common AC 102B —22, 23
Test Mode Indicator (TM) TM 142 From DCE 25