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V.35 DTE Cable
Description
Before selecting SA cables for a router, obtain the remote device type (including the synchronous/asynchronous mode and DTE/DCE role), and the signal standard, baud rate, and clock required for the remote device.
Structure and Pin Assignments
Figure 8-29 shows the structure of a V.35 DTE cable.
Table 8-46 lists the pin assignments of a V.35 DTE cable.
Table 8-46 Pin assignments of a V.35 DTE cable
X1 (DB28) |
Signal |
Direction |
X2 |
|---|---|---|---|
1 |
TXD+ |
→ |
P |
2 |
TXD- |
→ |
S |
19 |
RXD+ |
← |
R |
20 |
RXD- |
← |
T |
17 |
RXC+ |
← |
V |
18 |
RXC- |
← |
X |
3 |
TXC+ |
← |
Y |
4 |
TXC- |
← |
AA |
15 |
TXCE+ |
→ |
U |
16 |
TXCE- |
→ |
W |
11 |
DCD+ |
← |
F |
22 |
LL |
→ |
J |
13 |
RTS+ |
→ |
C |
23 |
CTS+ |
← |
D |
27 |
DTR+ |
→ |
H |
25 |
DSR+ |
← |
E |
21 |
GND |
←→ |
B |
6 |
GND |
←→ |
A |
10 |
MODE_DCE |
||
7 |
MODE0 |
||
8 |
MODE1 |
Connection
A V.35 DTE cable is connected as follows:
- The X1 connector (DB28) is connected to the SA interface card of a router.
- Connection of the X2 connector depends on the type of the WAN link:
- If the WAN link is a digital data network (DDN) line, connect the X2 connector to an interface of a channel service unit (CSU) or data service unit (DSU).
- If the WAN link is a dial-up line, connect the X2 connector to the serial interface on a modem.
Ordering Information
Table 8-47 provides the V.35 DTE cable ordering information.