RELEASED
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
Figure 89. The Time Available to the Linecard
ETT1 Port
Cell
Delay
DS
EPP
Linecard
Grant
Delay
“Everything else” budget
EPP/DS budget
The time available to the linecard is a function of the round trip minus the time
used by the EPP/DS devices.
C.2
THE 8B/10B INTERFACE TO THE DATASLICE
This section describes the external interface to the Dataslice. It explains how each physical link should be
configured, how the links are combined to carry cell traffic, and what errors may occur and what impact
those errors may have.
The Dataslice uses 12 physical links in order to provide a 10 Gbit/s aggregate channel rate. The 72 byte
cells carried across the channel are striped across the 12 individual links. Figure 90 shows this striping in
one direction.
328
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
PMC [ PMC-SIERRA, INC ]
