Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual page 33

Hardware Reference
C613-03023-00 REV J
Figure 18: Pin wiring diagram for a V.35 DTE transition cable to an AMPLIMITE 50-way
connector
D50 SCSI-2 Male
(to router)
Connect to backshell
1
→
TD 12
37
(−5V) 25
←
TC 10
35
←
RD 2
27
←
RC 8
33
→
RTS 14
←
CTS 3
←
CD 5
→
DTR 13
←
DSR 4
→
LL 16
→
RL 15
FGND 46
FSELB 47
200R
180R
105R
180R
200R
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. UL2919 28AWG. Twisted pairing
must be 1-26, 2-27, 3-28, etc.
(3) M34 connector shells must be metal.
Connect braid to connector shells to
make a 360° connection.
(4) Standard cable length is
2.05m ± 0.05m.
Insulating
Sheath
Cable Shield
Network A
300R
Ferrite
Cable
(5) Ferrite must be fitted to cable no more
than 25mm from rear of D50 SCSI-2
backshell.
(6) Resistors are 1% tolerance.
(7) See accompanying text for information
about earth loop conditions.
(8) Cable version 2.0.
M34 Male
(to DCE)
A Shield
B SIG G
P SDA (103)
A
S SDB
Y TCA (114)
B
AA TCB
R RDA (104)
B
T RDB
V RCA (115)
B
X RCB
C RTS (105)
D CTS (106)
F DCD (109)
H DTR (108)
E DSR (107)
L LL (141)
N RL (140)
Network B
300R
Pin C Pin KK
Pin A Pin MM
Pin D Pin LL
Pin B Pin NN
M34 Male — Pin View
A50V35T
33