HP J3138A, Руководство по установке

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2-4
Installing the HP AdvanceStack Internet Router
Preparing to Connect to a Network
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Synchronous Serial Connections
Before you connect a device to the synchronous serial port, you will need to
know the following:
■
The type of device, DTE or DCE, you are connecting to the synchronous
serial interface
■
The type of connector, male or female, required to connect to the device.
■
The signaling standard required by the device.
DTE or DCE
A device that communicates over a synchronous serial interface is either a
DTE or DCE device. A DCE device provides a clock signal that paces the
communications between the devices and the router. A DTE device does not
provide a clock signal. DTE devices usually connect to DCE devices. The
documentation that came with the device should indicate whether it is a DTE
or DCE device. (Some devices have a jumper to select either mode.) If you
cannot find the information in the documentation, refer to table 2-2 to help
you select the proper device type.
Table 2-2. Typical DTE and DCE Devices
Device Type Gender Typical Devices
DTE Male
1
* Terminal
* PC
DCE Female
2
* Modem
* CSU/DSU
3
* Multiplexer
1. If pins protrude from the base of the connector, the connector is male.
2. If the connector has holes to accept pins, the connector is female.
3. Channel service unit/data service unit.