Microtronix Access User Guide
7.1.2 HDLC Parameters
Local interface name: The X.25 WAN interface being configured. This will be WAN 0 (hdlc0),
or WAN 1 (hdlc1).
Interface Type: The physical interface type to be used. The supported types are: RS232/V.24,
V.35, X.21, RS449/V.36, RS530, and RS530a. Refer to the Cables and Connectors section to
determine the appropriate cable for the application.
Clock Source: Specifies the source of the synchronous clocking (timing) signal.
If connecting to a DCE device (like a modem) that provides the clock signal, an external clock
source is chosen. For independent transmit and receive clocks, choose External. For a single
clock signal source, choose RxFromTx. When using a tail circuit cable, choose TxFromRx.
If the interface is to provide clocking signal to a DTE device, then select an internal source and
specify a Clock Rate appropriate for the interface. Choose Internal for independent receive and
transmit clocks, or DTE to derive the clock from the DTE’s external transmit clock.
Clock Rate: Specifies the clock rate used for the internal clock source (Internal, TxFromRx,
TxInt). Do not set the speed higher than the attached device’s capability. RS232 is limited to
128Kb/s with a short, reliable cable. Otherwise RS232 is limited to 64Kb/s. Other interface
types allow speeds up to 10 Mbps.
DTR Detection: If the attached device does not support a DTR signal, then disable the
detection (assumed readiness). Otherwise, enable it for detection of the device’s readiness to
communicate.
Enable: Check to enable HDLC/X.25 operation. Un-check o prevent the port from
communicating using HDLC/X.25. HDLC must be disabled before the port can be available for
terminal or synchronous server configuration.
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