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V i p e r s a t C o nf i g u r a t i o n
The GIR setting for each Remote is specified using the STDMA Remote Poli-
cies screen (refer to the section "Set Remote Policies" on page 3-21). When
combined with Auto switching, GIR allows trigger points to be set where the
Remote will jump out into SCPC mode. This is done using the Load Switch
setting. Note that, for this function, Auto switching must be Enabled on this
Hub unit, and corresponding Remote modems must be configured with Auto
switching and Load switching Enabled. Also, the settings for Step Up and Step
Down Threshold values should be adjusted as necessary for the application.
5 – Entry Channel
The Entry Channel mode provides remotes in the group with a shared channel
in which they can gain initial access to the network. Since very small STDMA
data rates are required in this configuration, a larger number of remotes can
share the cycle. As soon as the Hub receives an STDMA ACK from the
Remote, it initiates an immediate switch to SCPC mode based on the policy set
for that Remote. Note that the switch occurs as soon as the Hub receives an
ACK even though there may not be traffic at that time. The persistence of the
link will be determined by the unit's flag settings.
When choosing Entry Channel as the Hub type for the STDMA Controller, the
Auto switching feature must be Enabled on this Hub unit, and switching policies
for the remotes must be configured (refer to the section "Set Remote Policies"
on page 3-21). Corresponding Remote modems must be configured with Auto
switching and Load switching Enabled. Note that the settings for Step Up and
Step Down Threshold values should be adjusted as necessary for the applica-
tion.
This mode is designed to accommodate the needs of a Remote that will not be
continuously connected to the network, but which has the need to be able to
make an on-demand connection when required, such as in a mobile application.
In the event of a power outage, Entry Channel provides a bandwidth-efficient
method for remotes with low latency requirements to re-enter the network once
power is restored.
Refer to Appendix B, "Automatic Switching", for additional information on
how each of the bandwidth allocation modes functions and the parameters used
to calculate the commands for each mode.
Group ID
The STDMA Group ID number defines a group of equipment (including
CDD-56X Hub and Remote units) that will respond to the output of a single
STDMA burst controller. This group is addressable within a network which, in
turn, is defined by the Network ID number assigned to the CDD-56X.
V i p e r s a t C D D - 5 6 X S e r i e s U s e r G u i d e
3-12
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