ADTRAN Express L128, User Manual

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Glosssary
61202.070L1-1 Express L128/L128T User Manual 167
serving area
Region surrounding a broadcasting station where signal strength is at or
above a stated minimum. The geographic area handled by a telephone central
office facility. Generally equivalent to a LATA.
SNMP
Simple Network Management Protocol. SNMP provides a means to monitor
and set network configuration and runtime parameters.
spanning tree
A loop-free subset of the topology of a network.
SPCS
Stored Program Controlled Switch. A digital switch that supports call control,
routing, and supplementary services provision under software 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 remote LAN to ap-
pear as if it is still connected to the LAN device even though it is not. The
spoofing saves the WAN bandwidth, because no packet is ever sent out on the
WAN.
synchronous
(1) The condition occurring when two events happen in a specific time rela-
tionship 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 communication used to send blocks
of information. Synchronous data transmission is used in high speed data cir-
cuits because there is less overhead than asynchronous transmission of char-
acters which contain two extra bits per character to effect timing.
T1
Also T-1. A digital transmission link with a capacity of 1.544 Mbps. T1 uses
two pairs of normal twisted wires. T1 normally can handle 24 voice conversa-
tions with each conversation being digitized at 64 kbps. With more advanced
digital voice encoding techniques, it can handle more voice channels. T1 is a
standard for digital transmission in North America.
TA
Terminal Adaptor. A DCE that connects to the ISDN S-Interface and enables
non-ISDN terminal equipment to communicate over the ISDN.
TE1
Terminal Equipment Type 1. ISDN-compatible terminals.