Nortel Passport 4400 Series Hardware Installation Manual page 127

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