Cisco 7000 Series Hardware Installation And Maintenance Manual page 251

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Table A-10
X.21 Adapter Cable Signals
FSIP End, HD
60-Position
Plug
DTE Cable
Signal (J1)
Pin
Ground
46
TxD/RxD+
11
—>
TxD/RxD–
12
—>
RTS/CTS+
9
—>
RTS/CTS –
10
—>
RxD/TxD+
28
<—
RxD/TxD–
27
<—
CTS/RTS+
1
<—
CTS/RTS –
2
<—
RxC/TxCE+
26
<—
RxC/TxCE–
25
<—
Circuit ground
15
Ground
48
Mode_2
47
Ground
51
Mode_DCE
52
Not used
16
Network
End,
DB-15 Plug
Pin Signal (J2)
1
2
Transmit+
9
Transmit–
3
Control+
10
Control–
4
Receive+
11
Receive–
5
Indication+
12
Indication–
6
Timing+
13
Timing–
8
Circuit ground
Shorting group
Shorting group
8
Not used
Serial Adapter Cable Pinouts
SIP End, HD
60-Position
Plug
DCE Cable
Signal (J1)
Pin
Shield ground
46
RxD/TxD+
28
<—
RxD/TxD–
27
<—
CTS/RTS+
1
<—
CTS/RTS –
2
<—
TxD/RxD+
11
—>
TxD/RxD–
12
—>
RTS/CTS+
9
—>
RTS/CTS–
10
—>
TxC/RxC+
24
—>
TxC/RxC –
23
—>
Circuit ground
15
Ground
48
Mode_2
47
Not used
16
Cabling Specifications A-9
Network End,
DB-15
Receptacle
Pin Signal (J2)
1
Shield ground
2
Transmit+
9
Transmit–
3
Control+
10
Control–
4
Receive+
11
Receive–
5
Indication+
12
Indication–
6
Timing+
13
Timing–
8
Circuit ground
Shorting
group
8
Not used

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