Comtech EF Data Vipersat 564L Guía de usuario Pagina 141

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Appendix E - Glossary E-1
A
PPENDIX
GLOSSARY
A
ALC Automatic Limit Control – A closed loop mechanism controlling the gain
stabilization of the HPAs 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 for bandwidth adjust-
ment sent by a VIPERSAT modem to the VMS when Automatic Switching is
enabled.
ATM Asynchronous Transfer Mode
B
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
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