For idle frames it contains the address
of the upstream neighbor station.
Physical Interface
Two families of optional reconciliation sublayers are defined: The Packet PHYs and
SONET/SDH PHYs. The reconciliation sublayers map the MAC physical layer service
primitives to standard electrical interfaces used by these PHYs. To ensure interoperability,
an interface that is compliant to the standard shall implement at least one of
the defined PHYs. Packet PHYs are 1 Gb/s and 10 Gb/s PHYs, similar to those defined
by IEEE 802.3, but with some deviations.
The SONET/SDH reconciliation sublayers provide interfaces to adaptation sublayers
that specify either frame-mapped generic framing procedure (GFP), byte-synchronous
high-level data link control (HDLC)-like framing, or link access procedure-SDH (LAPS)
framing for SONET/SDH networks and PHYs operating at 155 Mb/s to 10 Gb/s or higher.
Figure 12.21 shows the relationship between the RPR MAC and the other sublayers.
Packet PHYs The requirements for the 1 Gb/s and 10 Gb/s Packet PHYs are described
in IEEE 802.3. The following exceptions and changes apply to the specifications:
?– Repeaters are not supported.
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