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144 SunFDDI/P1.0 Adapter User’s Guide—May 1997
RARP
(Reverse Address Resolution Protocol). A protocol used by diskless machines and
their servers within local networks such as Ethernet or FDDI. In a RARP
exchange, a diskless machine broadcasts its MAC address. A boot server
responds to that client with the client’s IP address, enabling the client to begin
the boot process.
RMT
(Ring Management). The portion of CMT that monitors the MAC. It provides a
trace mechanism to handle the stuck beaconing condition, and also detects
duplicate addresses on the ring.
RSAS
(redundant single-attach station). An FDDI station in which single-attach
interfaces are paired, with one active and the other a hot standby. In an RSAS
with connections to two different dual-attach concentrators, you enjoy the
network availability afforded by concentrators with single-attach connections,
plus, for the RSAS itself, the station availability of a dual-attach station.
SAP
(service access point). A logical interface between two adjacent protocol layers
(such as LLC and IP).
SAS
(single attachment station). An FDDI station that attaches to a single FDDI ring,
as distinguished from a dual-attached station, which attaches to both rings in a
dual ring.
SMT
(Station Management). The complete standard of PHY layer and frame-based
protocols to be supported by conforming FDDI stations.
THT
(Token-Holding Timer). A timer in the FDDI MAC protocol that controls the
length of time a station can hold a token for asynchronous transmission.
timing jitter
The deviation of clock recovery that can occur when the receiver attempts to
recover both clocking and data from the received signal. The PHY specification
describes a phase lock loop (PLL) and elasticity buffer to eliminate jitter.