Glossary
322
HST-3000 Ethernet Testing User’s Guide
R
Recovery Rate — 50 percent
of the overload rate used to
force a network element to drop
frames.
RFC 2544 — Document titled
Benchmarking Methodology for
Network Interconnect Devices,
published by the Internet Engi-
neering Task Force. RFC 2544
defines a series of tests that can
be used to measure the perfor-
mance characteristics of data
networking devices. Using the
HST, you can run automated
tests configured using the key
parameters required for each of
the pre-defined tests.
RJ-45 — Jacks on the left side
of the Ethernet SIM used for 10/
100/1G electrical Ethernet
testing. The RJ-45 jack on the
top of the base unit is used for
Ethernet TE, VoIP, and IP Video
testing.
Runt — An Ethernet frame that
is shorter than the IEEE 802.3
minimum frame length of 64
bytes and contains an errored
FCS, or a Fibre Channel frame
that is shorter than the minimum
28 byte frame length containing
an errored CRC.
Rx — Receive.
S
Service disruption time —
The time between Ethernet or
Fibre Channel frames
(maximum inter-frame gap)
when service switches to a
protect line. The Svc Disruption
(ms) result in the L2 Link Stats
category displays the service
disruption time.
SFD — Start of frame delimiter.
Part of an Ethernet frame
preamble that indicates that the
destination address frame is
about to begin.
SFP — Small form-factor plug-
gable module. Used throughout
this guide to represent plug-
gable optical transceivers
(modules).SVLAN — Stacked
VLAN. Used in Q-in-Q traffic to
provide a second encapsulation
tag, expanding the number of
VLANs available. Often consid-
ered the VLAN assigned to the
service provider (as opposed to
the customer).
T
TCP — Transmission Control
Protocol. Layer 4 protocol that
allows two devices to establish a
connection and exchange
streams of data. The HST can
be configured to transmit and
analyze layer 4 traffic carrying a
TCP header.
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