Released
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
which will be several cell times after the linecard has sent the Suggested_TDM_sync to
the ETT1 port.
If the Scheduler does not see an incoming Suggested_TDM_sync signal for three TDM_periods then it will
issue an interrupt indicating that the sync source has failed. However it will continue to operate with the
current values of frequency and phase.
1.6 ETT1 USAGE OF THE LCS PROTOCOL
This section provides details of how the LCS header is used in an ETT1 system. Further information on the
operation of the LCS protocol is in the “LCS Protocol Specification -- Protocol Version 2”, available from
PMC-Sierra, Inc.
1.6.1 LCS Protocol Prepend
LCS segments are 72 or 84 bytes in length. The line to switch format is shown in Table 3, while Table 5
shows the field definitions of this format. Likewise, Tables 3 and 4 show the switch to line format and field
definitions, respectively.
64
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
PMC [ PMC-SIERRA, INC ]
