32Chapter 2: Installation
Figure 14 AUX cable assembly
WAN Interface to
DSU/CSU
Introduction to the synchronous/asynchronous serial interface
The fixed WAN interface of the Router 5000 is a synchronous/asynchronous serial interface, which is usually used for the connection with a WAN device, such as a Modem or CSU/DSU. It can operate in the synchronous/asynchronous mode or DTE/DCE mode, depending on the application. For the attributes of the interface, please refer to Table 15.
Table 15 Attributes of the synchronous/asynchronous serial interface
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| Description |
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Attribute | Synchronous |
| Asynchronous | |
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Connector type | DB28 or DB50 |
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Interface standard and | V.24 |
| V.35/X.21 | RS232 |
operating mode |
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DTE/DCE | DTE/DCE |
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Minimum baud rate | 1200 |
| 1200 | 300 |
(bps) |
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Maximum baud rate | 64K |
| 2.048M | 115200 |
(bps) |
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Matching cable | V.24 (RS232) DTE cable |
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| V.24 | (RS232) DCE cable |
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| V.35 | DTE cable |
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| V.35 | DCE cable |
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| X.21 | DTE cable |
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| X.21 | DCE cable |
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