Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual page 32

32
Figure 17: Pin wiring diagram for an RS-232 DCE transition cable to an AMPLIMITE 50-way
connector
D50 SCSI-2 Male
(to router)
Connect to backshell
←
RD 2
→
TD 12
←
CTS 3
→
RTS 14
→
DTR 13
SG 1
→
RL 15
→
TCG 20
←
DSR 4
FGND 21
FSELA 22
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) D25 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 4.0.
Insulating
Sheath
Cable Shield
Ferrite
Cable
Port Interface Card
D25 Female
(to DTE)
1 Shield
2 TD (103)
3 RD (104)
4 RTS (105)
5 CTS (106)
6 DSR (107)
7 SG (102)
8 CD (109)
15 TC (114)
17 RC (115)
20 DTR (108)
Pin 13 Pin 1
Pin 25 Pin 14
D25 Female — Pin View
A50R232C
C613-03023-00 REV J