User Manual

Boomer II User Manual & Integrator’s Guide
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Message Routing and Migration
BM210012WT09 93 Wavenet Technology
On DataTAC 6000 systems the host ID field consists of:
q 1 to 4 bytes
q ASCII ‘;’ (semicolon) delimiter
q Host password of 1 to 8 bytes
q Carriage return
On DataTAC 4000 systems the RNG (ARDIS switch) locates the
calling X.25 address to verify it is in the database. A valid calling
address is then associated with only those terminals allocated to a
particular host.
Extended SCR
DataTAC 4000 and 5000 systems support additional message types and
functions beyond the basic SCR functionality. Specifically, extended
SCR supports the following features:
On DataTAC 4000 systems:
q Sends binary headers and data
q Notifies the host of terminal network activity
On DataTAC 5000 systems:
q Notifies the host of terminal network activity
q Performs loopback diagnostics
q Notifies the host of terminal-to-host connection (session)
activity
For a full description of these extensions, refer to the system host
application programmer’s manuals.
On DataTAC 4000 and 5000 systems the extended functions enable the
network to notify the host that a terminal has registered with or
deregistered from the network. This allows the host to avoid X.25
communications costs associated with attempting to reach a shut down
terminal.
This extension set also involves the no-acknowledgment (No-ACK)
option for host-to-terminal messages. When the No-ACK option is
used on DataTAC 5000 systems, the host instructs the RNG to deliver
the over-the-air message as “No-ACK-needed”, and none is returned.
On DataTAC 4000 and 6000 systems, which lack the No-ACK option,
the RNG sends all messages as “ACK-required,” regardless of a host
request for “No-ACK-needed.” When the RNG receives the ACK from
the terminal, it is discarded or used to provide input to other system-
specific features.
Avoid using additional message types if you want the application to be
widely compatible. These extended features are not always available on
all DataTAC 5000 systems. These features are enabled and controlled
by the network operator on a per-host basis. Check with your target
network operators before using SCR system extensions.