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Connectors, Cables, and Pin Assignments
C-6
9820-A2-GB20-20June 2000
User and Network Data Port Connectors
(Models 9820, 9820-2M, 9820-8M)
The following table provides the pin assignments for the EIA-530-A connector to
the DTE or NTU.
Signal
Circuit
Mnemonic
ITU # Direction
25-Pin
Pin #
Shield — — — 1
Transmit 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 To/From
DCE
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)
Transmit Signal Element
Timing (TXC – DCE Source)
DB 114 From DCE 12 (B)
15 (A)
Received Signal Element
Timing (RXC – DCE Source)
DD 115 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
Test Mode Indicator (TM) TM 142 From DCE 25
NOTE:
The user data port has a DCE personality, while the network data port has a
DTE personality.