Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document.
Note: Even the most advanced machine translation cannot match the quality of professional translators.
Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
RS449 DCE Cable
Connection
An RS449 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 (DB37) 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.
Appearance and Structure
Figure 7-23 Structure of the RS449 DCE Cable
![]( "Click to enlarge")
Pin Assignments
Table 7-36 lists the pin assignments of an RS449 DCE cable.
Table 7-36 Pin assignments of an RS449 DCE cable
X1 (DB28) |
Signal |
Direction |
X2 (DB37) |
|---|---|---|---|
27 |
DTR+ |
→ |
11 |
28 |
DTR- |
→ |
29 |
25 |
DSR+ |
← |
12 |
26 |
DSR- |
← |
30 |
13 |
RTS+ |
→ |
9 |
14 |
RTS- |
→ |
27 |
23 |
CTS+ |
← |
7 |
24 |
CTS- |
← |
25 |
11 |
DCD+ |
→ |
13 |
12 |
DCD- |
→ |
31 |
19 |
RXD+ |
← |
4 |
20 |
RXD- |
← |
22 |
1 |
TXD+ |
→ |
6 |
2 |
TXD- |
→ |
24 |
15 |
TXCE+ |
→ |
8 |
16 |
TXCE- |
→ |
26 |
17 |
RXC+ |
← |
17 |
18 |
RXC- |
← |
35 |
3 |
TXC+ |
→ |
5 |
4 |
TXC- |
→ |
23 |
22 |
LL |
→ |
10 |
21 |
GND |
←→ |
1 |
6 |
GND |
←→ |
19 |
8 |
MODE_DCE |
Technical Specifications
Table 7-37 Technical specifications of the RS449 DCE Cable
| Item | Details |
|---|---|
| Part Number | 04043596 |
| Model | SS-DL-RS449-DCE-3 |
| Description | Single Cable, RS449 Serial Port Cable, 3m, D28M, 100CC13P0.32P296U(S), D37F-I, DCE |
| Cable length [m] | 3 m |
| Connector type X1 | D28M |
| Connector type X2 | D37F-I |
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.