Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 533)

Appendix H - Glossary H-1
A
P P E N D I X
G
LOSSARY
A
ACK A signal used in computing and other fields to indicate acknowledgement, such
as a packet message used in TCP to acknowledge the receipt of a packet.
ACM Adaptive Coding and Modulation – A technique that optimizes throughput in a
wireless data link by adapting the forward error correction code rate and the
modulation order according to the noise conditions (or other impairments) on
the link. A feature that is supported in CEFD modems such as the CDM-840
Remote Router.
ARP Address Resolution Protocol – A protocol for a LAN device to determine the
MAC address of a locally connected device given its IP address. See also MAC.
ASR Automatic Switch Request – A switch request message generated by older
Vipersat modems (e.g., CDM-570/L) that is sent to the VMS to establish a new
satellite link or adjust bandwidth between source and destination IP addresses.
B
Base
Modem
The main component in a satellite communications modem that consistes of a
circuit board with the modem hardware and firmware and the associeated inter-
faces.