A-11 – Nortel Networks Passport 4400 User Manual
Page 127
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Cable Diagram Pin Assignments
Passport 4400 Hardware Installation Manual
A-11
Figure A-8. Cable Model No. NTAU26AA - 4400 to DCE
NC
NC
15-Pin
X.21 Male
MD50
Male
To 4400
Data Terminal
Equipment (DTE)
To Data
Communication
Equipment
(DCE)
Receive Data A
20
4
Receive Data A
Receive Data B
45
11
Receive Data A
Control A
8
3
Clocking A
Control B
33
10
Clocking A
Transmit Data A
6
2
Transmit Data A (TD A)
Transmit Data B
31
9
Transmit Data B (TD B)
Transmit Data Clock A
21
6
Signalling A (S B)
Transmit Data Clock B
46
13
Signalling B (S B)
Indication A
22
5
Internal Clocking A (IC A)
Indication B
47
12
Internal Clocking B (IC B)
Ground
43
8
Ground (GND)
Unassigned
50
15
Unassigned (UN A)
External Select A
1
Ground
26
External Select B
2
Ground
27
Cable Present Status
14
Ground
39
1
Frame Ground (F GND)
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