Configuring network interfaces Configure serial interfaces
Digi TransPort® Routers User Guide
318
Configure synchronous communications
The most common form of serial communications currently is asynchronous. Synchronous serial
communications links are still in use, and TransPort routers can support these. HDLC is a synchronous
protocol still in use that you can use with TransPort routers. This section describes how to configure
the synchronous communications interfaces. To enable synchronous mode, a protocol such as LAPB
must be configured to use a synchronous port as its lower layer interface. On certain models, an
informational message will appear on the web page which states that jumper settings may need to be
changed in order to support synchronous serial operation.
Note The number of synchronous serial ports available varies depending on the model and any
optional modules fitted.
ÉWeb
1. Go to Configuration > Network > Interfaces > Serial >Serial Port n > Sync Port n.
2. Configure synchronous port settings:
Description
A description of the interface, if one is required.
Clock source Internal / External
Specifies whether the synchronous port generates the clock signal (Internal) or relies on an
external source for the clock signal (External).
Mode
The specific serial protocol to use. Which buttons appear depend upon the capabilities of the
interface. The options available are; V.35, EIA530, RS232, EIA530A, RS449, and X.21.
Invert RX clock
When enabled, causes the router to invert the voltage level of the receive clock signal.
Invert TX clock
When enabled, causes the router to invert the voltage level of the transmit clock signal.
Encoding NRZ / NRZI
Select between non-return to zero (NRZ) and non-return to zero (inverted) (NRZI) signal
encodings.
3. Click Apply.
Command line
Command Instance Parameter Values Equivalent web parameter
sy 0 descr Text description of interface Description
sy 0 clksrc int,ext Clock source
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