Stdma; Stdma Tx Rate; Hub Type; Figure 3-8 Hub Type Prompt - Comtech EF Data Vipersat CDD-562L User Manual

V i p e r s a t C o nf i g u r a t i o n

STDMA

This menu item is read-only and shows the current state of STDMA in the
CDD-56X. In order to change the STDMA state, refer to the section "Feature
Configuration" on page 3-4.

STDMA Tx Rate

This menu item shows the STDMA Transmit Rate (in bps) of data that the
CDD-56X receives. This item is read-only and cannot be modified in this menu.

Hub Type

This menu item is only displayed if the CDD-56X is being used as a Hub in the
network, and provides the functionality for the STDMA Burst Controller.
Vipersat STDMA has five modes of operation:
• Fixed — all remotes get the same data slot time (slot size) in the cycle,
• Dynamic Slot — data slot time of remotes vary according to activity,
• Dynamic Cycle — slot time and cycle time vary according to activity of
• GIR (Guaranteed Information Rate) — each remote always has at least the
• Entry Channel — remotes run in SCPC mode, but STDMA is used for
The Hub can be configured to operate as one of the five types by entering a T at
the command prompt to display the dialog shown in figure 3-8.
3-10
regardless of activity. Cycle time is fixed also.
cycle time does not.
remotes.
minimum data slot size when needed, and cycle time is variable up to a
maximum of one second.
maintenance and control channel.
Figure 3-8
Hub Type prompt
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