Connector Type
Electrical Installation 45
Issue 1, September 1998
ADCP-62-023
© 1998, ADC Telecommunications, Inc.
Connector Pinouts
DCE DB25 Female Connector (Data Ports 1 and 2)
Note: For purposes of connection and function,
the ICX-250 should be considered a DCE.
Pin
Signal
Name
Mnemonic
Source
V.35
EIA-530A
1
Shield
X
2
Transmit Data
TXD+
BA (A)
DTE
X
X
3
Receive Data
RXD+
BB (A)
DCE
X
X
4
Request to Send
RTS+
CA (A)
DTE
X
X
5
Clear to Send
CTS+
CB (A)
DCE
X
X
6
DCE Ready
DSR+
CC
DCE
X
X
7
Signal Common
AB
X
X
8
Receive Line Signal Detector
DCD+
CF (A)
DCE
X
X
9
Receive Signal Element Timing
RXCLK-
DD (B)
DCE
X
X
10
Receive Line Signal Detector
DCD-
CF (B)
DCE
X
11
Transmit Signal Element Timing (DTE)
TXCLK
DA (B)
DTE
X
12
Transmit Signal Element Timing (DCE)
TXCLK-
DB (B)
DCE
X
X
13
Clear to Send
CTS-
CB (B)
DCE
X
14
Transmit Data
TXD-
BA (B)
DTE
X
X
15
Transmit Signal Element Timing (DCE)
TXCLK+
DB (A)
DCE
X
X
16
Receive Data
RXD-
BB (B)
DCE
X
X
17
Receive Signal Element Timing (DCE)
RXCLK+
DD (A)
DCE
X
X
18
Local Loopback
LL
LL
DTE
X
19
Request to Send
RTS-
CA (B)
DTE
X
20
DTE Ready
DTR+
CD
DTE
X
21
Remote Loopback
RL
RL
DTE
X
22
Ring Indicator
CE
DCE
X
23
Signal Common
AC
X
24
Transmit Signal Element Timing (DTE)
TXCLK
DA (A)
DCE
25
Test Mode
TM
TM
X