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DESCRIPTION
1.11 HDLC-UI OPERATION
There are two modes of HDLC-UI operation. The first mode consists of an "HDLC Un-numbered
Information frame" mode and the other mode consists of an "HDLC Raw Serial Tunnel" mode.
The HDLC-UI mode of operation allows ATCS messages that are encapsulated in HDLC UI frames
to be sent and received on the serial interface. Such ATCS messages are routed according to the
message's ATCS destination address after their HDLC headers are removed.
The "HDLC Raw Serial Tunnel" mode of operation requires that the "Persistent Serial Tunnel"
functionality be enabled. When the Tunnel is established, all forms of HDLC frames are sent and
received on the serial interface complete with their HDLC headers, get conveyed across the
Persistent Tunnel, and then are sent out the remote WAG's serial interface which is also
configured for HDLC Raw Serial Tunnel mode.
1-16
Document No.: COM-00-05-16
June 2006, Revised June 2014
Version: C.1
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