Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual page 35

Hardware Reference
C613-03023-00 REV J
Figure 20: 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
1
→
TD 12
37
→
RTS 14
39
←
RD 2
27
←
CD 5
30
←
RXC 8
33
Pin 1 Pin 25
Pin 26 Pin 50
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.
Insulating
Sheath
Cable Shield
Ferrite
Cable
35
D15 Male
(to DCE)
1 Shield
8 Ground
2 Transmit (A)
9 (B)
3 Control (A)
10 (B)
4 Receive (A)
11 (B)
5 Indication (A)
12 (B)
6 S (Clock) (A)
13 (B)
Pin 1 Pin 8
Pin 9 Pin 15
D15 Male — Pin View
A50X21T