A-10 – Nortel Networks Passport 4400 User Manual
Page 126
Cable Diagram Pin Assignments
Passport 4400 Hardware Installation Manual
A-10
Figure A-7. Cable Model No. NTAU27AA - 4400 to DTE
NC
NC
15-Pin
X.21 Female
To Data
Terminal
Equipment (DTE)
MD50
Male
To 4400
Data Terminal
Equipment (DTE)
Receive Data
20
2
Transmit Data A (TD A)
Receive Data B
45
9
Transmit Data B (TD B)
Control A
8
5
Internal Clocking A (IC A)
Control B
33
12
Internal Clocking B (IC B)
Transmit Data A V11
6
4
Receive Data A (RD A)
Transmit Data B V11
31
11
Receive Data B (RD B)
Indication A
22
3
Clocking A
Indication B
47
10
Clocking B
External Receive Data Clock A V11
7
6
Signalling A
External Transmit Clock B V11
32
13
Signalling B
Ground
43
8
Ground (GND)
External Select A (EXT SEL A)
1
Ground
26
External Select B (EXT SEL B)
2
Gound
27
Cable Present Status
14
Ground
39
15
Unassigned (UN A)
Unassigned
50
1
Frame Ground (F GND)