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RS530 DCE 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 8-36 shows the structure of an RS530 DCE cable.
Table 8-60 lists the pin assignments of an RS530 DCE cable.
Table 8-60 Pin assignments of an RS530 DCE cable
X1 (DB28) |
Signal |
Direction |
X2 (DB25) |
|---|---|---|---|
27 |
DTR+ |
→ |
6 |
28 |
DTR- |
→ |
22 |
25 |
DSR+ |
← |
20 |
26 |
DSR- |
← |
23 |
13 |
RTS+ |
→ |
5 |
14 |
RTS- |
→ |
13 |
23 |
CTS+ |
← |
4 |
24 |
CTS- |
← |
19 |
11 |
DCD+ |
→ |
8 |
12 |
DCD- |
→ |
10 |
19 |
RXD+ |
← |
2 |
20 |
RXD- |
← |
14 |
1 |
TXD+ |
→ |
3 |
2 |
TXD- |
→ |
16 |
15 |
TXCE+ |
→ |
17 |
16 |
TXCE- |
→ |
9 |
17 |
RXC+ |
← |
24 |
18 |
RXC- |
← |
11 |
3 |
TXC+ |
→ |
15 |
4 |
TXC- |
→ |
12 |
22 |
LL |
← |
18 |
21 |
GND |
←→ |
1 |
6 |
GND |
←→ |
7 |
7 |
MODE0 |
||
9 |
MODE2 |
Connection
An RS530 DCE cable is connected as follows:
- The X1 connector (DB28) is connected to the SA interface card of a router.
- Connection of the X2 connector (DB25) 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 8-61 provides the RS530 DCE cable ordering information.