ADTRAN Express 6120 Manual de instrucciones descargar pdf (Pagina 150)

Glossary

Glossary-10 Express 6100/6120 User Manual 61200176L1-1

SPCS

StoredProgram ControlledSwitch. Adigitalswitchthatsupportscall

control, routing, and supplementary services provision under soft-

ware control. All ISDN switches are SPCSs.

spoofing

Spoofing reduces the required bandwidth by having devices, such as

bridges or routers, answer for the remote devices. This causes the re-

moteLANtoappearasifitisstillconnectedtotheLANdeviceeven

though it is not. The spoofingsaves theWAN bandwidth,because no

packet is ever sent out on the WAN.

synchronous

(1)Theconditionoccurringwhentwoeventshappeninaspecifictime

relationship with each other, both under control of a master clock; (2)

A method of data transmission requiring the transmission of timing

pulses to keep the sender and receiver synchronized in their commu-

nication used to send blocks of information. Synchronous data trans-

mission is used in high speed data circuits because there is less

overhead than asynchronous transmission ofcharacters which con-

tain two extra bits per character to effect timing.

AlsoT-1. Adigitaltransmissionlinkwithacapacityof1.544Mbps. T1

uses two pairs of normal twisted wires. T1 normally can handle 24

voiceconversationswitheachconversationbeingdigitizedat64kbps.

With more advanced digital voice encoding techniques, it can handle

more voice channels. T1 is a standard for digital transmission in

North America.

Terminal Adaptor. A DCE that connects to the ISDN S-Interface and en-

ables non-ISDNterminal equipmentto communicate over the ISDN.

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ADTRAN Express 6120 Manual de instrucciones Pagina 150