Appendix E - Glossary E-1
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PPENDIX
GLOSSARY
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ALC Automatic Limit Control is a closed loop mechanism controlling the gain
stabilization 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 is a switch request message used in legacy VMS
installations
ATM Asynchronous Transfer Mode (ATM)
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BER Bit Error Rate (sometimes Ratio) – A measure of the number of data bits
received incorrectly compared to the total number of bits transmitted.
BUC Block Up Converter
Bps Bits Per Second – A measure of transmission speed. See also kb/s &
Mb/s