Paradyne 9820-2M 用户手册

Connectors, Cables, and Pin Assignments

9820-A2-GB20-20

June 2000

This cable is used to connect the network data port to an NTU with an X.21
interface. It is a 25-position EIA-530A-to-15-pin X.21 (DB25-to-X.21) cable.

This cable (Part No. 035-0384-1031) is part of the X.21 Cable Kit (Feature No.
9008-F1-521).

99-16303

The following table provides the pin assignments for the DB25-to-X.21 network
cable.

Transmit Data ( TXD )

103

2 ( A )
14 ( B )

To DCE

2 ( A )
9 ( B )

Received Data ( RXD )

104

3 ( A )
16 ( B )

From DCE

4 ( A )
11 ( B )

Request to Send ( RTS )

105

4 ( A )
19 ( B )

To DCE

3 ( A )
10 ( B )

Signal Ground/Common ( SG )

102

7

—

8

Data Channel Received Line
Signal Detector ( RLSD or LSD )

109

8 ( A )
10 ( B )

From DCE

5 ( A )
12 ( B )

Transmit Signal Element/
Terminal Timing ( TT ) —
DTE Source

113

24 ( A )
11 ( B)

To DCE

7 ( A )
14 ( B )

Received Signal Element Timing
( RXC ) — DCE Source

115

17 ( A )
4 ( B )

From DCE

13 ( A )
3 ( B )