Allied Telesis AR Series Hardware Reference Manual page 69

Hardware Reference
Figure 34: Pin wiring diagram for an X.21 DTE transition cable to an AMPLIMITE 50-way connector.
D50 SCSI-2 Male
(to router)
Connect to backshell
→
→
←
←
←
Pin 1
Pin 26
D50 SCSI-2 Male — Pin View
Notes:
(1) → Output from router; ← Input to router.
(2) Use shielded cable with twisted pairs, e.g. UL2789 28AWG. Twisted pairing must be
1-26, 2-27, 3-28, etc.
(3) D15 connector shells to be metallised and fully shielded 360°.
(4) Standard cable length is 2.05m ± 0.05m.
(5) Ferrite must be fitted to cable no more than 25mm from rear of D50 SCSI-2 backshell.
(6) Cable version 3.0.
C613-03031-01 REV C
Cable Shield
1
TD 12
37
RTS 14
39
RD 2
27
CD 5
30
RXC 8
33
Pin 25
Ferrite
Pin 50
D15 Male
(to DCE)
Insulating
Sheath
1 Shield
8 Ground
2 Transmit
9
3 Control
10
4 Receive
11
5 Indication (A)
12
6 S (Clock)
13
Pin 1
Cable
Pin 9
D15 Male — Pin View
69
(A)
(B)
(A)
(B)
(A)
(B)
(B)
(A)
(B)
Pin 8
Pin 15
A50X21T