Glossary
G-4
MS-4900, Rev. A
session
A communication circuit selected for use by the IDR V1000 when configured
for stat demux operation. A
ctive sessions
in the screen display describe
current stat mux activity
statistical
multiplexer
also
stat mux. A technique of time-sharing on a data stream that allows for
more efficient usage of the carrying capacity. To accomplish this, additional
information must be added to each data packet to identify its characteristics
and its routing. Extracting this information at the receiver end requires
analogous
demultiplexing.
In the IDR V1000, the function that occurs is
demultiplexing
, or
stat demux
subscription
services
the news or information products that end users pay to receive
superscreen
One of the primary
Show Status
screens that identifies current activity in the
receiver, including carrier lock and modulation status, incoming data packets,
and miscellaneous error correction reports. Most of the superscreen
indications are relevant only to stat mux operation.
synchronous
also
sync
. Data transmission mode that establishes a clocking mechanism
between sender and receiver to identify the data. Synchronous data is
typically transmitted in blocks, rather than the character-at-a-time method of
asynchronous transmission.
TVC
Temporary Virtual Circuit.
A communication link established only for the
duration of the transmission. Contrast with
PVC
, which is an open, dedicated
circuit used for continuous transmission.
time-division
multiplexer
a component that divides transmission time into separate time slices allocated
for each sending source.
In the IDR V1000, incoming data is time-division demultiplexed to deliver
selected partitions of the aggregate data stream for further processing or for
direct output to a synchronous port.
transparent
asynchronous
TA
. Asynchronous transmission mode that is output through Serial 1 on the
IDR V1000 without stat mux processing in the receiver.
transparent
synchronous
Synchronous transmission mode that is output through Serial 4 or 5 on the
IDR V1000 without requiring additional CPU processing in the receiver.
uplink
Transmitting data from an earth station to a satellite.
upload
Transferring data from a computer to the IDR V1000. In WavePhore
operation,
uploading
usually refers to setting or modifying the configuration
parameters of an IDR V1000 at the factory.
Summary of Contents for IDR V1000
Page 21: ...Using the Front Panel 3 8 MS 4900 Rev A...
Page 46: ...Functional Overview MS 4900 Rev A 5 13 Figure 5 5 Four Port Daughtercard Model...
Page 48: ...Functional Overview MS 4900 Rev A 5 15...
Page 54: ...Appendix B Pin out Tables B 4 MS 4900 Rev A...
Page 61: ...Glossary G 6 MS 4900 Rev A...