User guide

Appendix I - Glossary I-1

PPENDIX

GLOSSARY

ALC Automatic Limit Control – A closed loop mechanism controlling the gain stabi-

lization of the HPA’s RF output power.

APL Asynchronous Party Line – A Vipersat term for RS-485 multi-drop bus used for

control of indoor equipment. See also SPL.

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 a Vipersat

modem and forwarded to the VMS to establish a new satellite link or adjust

bandwidth between source and destination IP addresses.

ATM Asynchronous Transfer Mode

BER Bit Error Rate (sometimes Ratio) – A measure of the number of data bits

received incorrectly compared to the total number of bits transmitted.