Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual page 36

36
Figure 21: Pin wiring diagram for an X.21 DCE 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
→
TXC 20
45
FGND 21
FSELC 23
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. 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 1.1.
Insulating
Sheath
Cable Shield
Ferrite
Cable
Port Interface Card
D15 Female
(to DTE)
1 Shield
8 Ground
4 Receive (A)
11 (B)
5 Indication (A)
12 (B)
2 Transmit (A)
9 (B)
3 Control (A)
10 (B)
6 S (Clock) (A)
13 (B)
Pin 8 Pin 1
Pin 15 Pin 9
D15 Female — Pin View
A50X21C
C613-03023-00 REV J