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Glossary
SQE
Signal Quality Error: In an Ethernet network, a message sent from a
transceiver to an attached machine that the collision-detection circuitry is
working.
SRB
Source-Route Bridging: Created by IBM, the bridging method used in
Token-Ring networks. The source determines the entire route to a destina-
tion before sending the data and includes that information in route informa-
tion fields (RIF) within each packet. Contrast with: transparent bridging.
SRT
source-route transparent bridging: A bridging scheme developed by
IBM, merging source-route and transparent bridging. SRT takes advantage
of both technologies in one device, fulfilling the needs of all end nodes.
Translation between bridging protocols is not necessary. Compare with: SR/
TLB.
SR/TLB
source-route translational bridging: A bridging method that
allows source-route stations to communicate with transparent bridge sta-
tions aided by an intermediate bridge that translates between the two bridge
protocols. Used for bridging between Token Ring and Ethernet. Compare
with: SRT.
SSAP
Source Service Access Point: The SAP of the network node identified
in the Source field of the packet. See also: DSAP and SAP.
SSE
Silicon Switching Engine: The software component of Cisco's silicon
switching technology, hard-coded into the Silicon Switch Processor (SSP).
Silicon switching is available only on the Cisco 7000 with an SSP. Silicon-
switched packets are compared to the silicon-switching cache on the SSE.
The SSP is a dedicated switch processor that offloads the switching process
from the route processor, providing a fast-switching solution, but packets
must still traverse the backplane of the router to get to the SSP and then back
to the exit interface.
SS-7 signaling
Signaling System 7: The current standard for telecommu-
nications switching control signaling. This is an out-of-band signaling that
establishes circuits and provides billing information.
Stac
A compression method developed by Stacker Corporation for use
over serial links.
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