Released
Data Sheet
PMC-2000164
ISSUE 3
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
ENHANCED TT1™ SWITCH FABRIC
3
Enhanced Port Processor
This chapter contains information on the Enhanced Port Processor device, part number PM9315-HC,
available from PMC-Sierra, Inc.
The Enhanced Port Processor (EPP) is based on the original TT1
TM
Port Processor, but has been greatly
improved in terms of its ability to handle OC-48c channels. The original Port Processor (PP) could only
support OC-48c at a single priority and required all linecards to be OC-48c. The EPP can support OC-48c
at the four priority levels and can be used in OC-48c or OC-192c mode on a port-by-port basis. This
enables the EPP to be used with the rest of the ETT1 Chip Set and to provide up to 128 ports of OC-48c.
Also, multicast handling has been substantially improved over the PP; now the EPP can handle multicast
at the OC-48c port level. However, the most important feature of the EPP is that it operates with the
original TT1 Dataslice, Crossbar and Scheduler devices.
The main features of the EPP are:
•
•
Four ports of OC-48c or one port of OC-192c.
Communicates with other EPPs (not PPs) which can be connected either to
OC-48c linecards or OC-192c linecards.
Supports four priority levels for unicast and multicast for OC-48c or OC-192c.
Supports TDM channels for OC-48c and OC-192c.
Uses the LCS (Linecard to Switch) protocol.
NOTE:
The EPP itself operates on an OC-192c rate stream; therefore, a multiplexer function is
needed for OC-48c mode. This multiplexer sits between the four OC-48c rate linecards
and the ETT1 port card, and maps the four incoming OC-48c rate streams onto a single
stream to the EPP. Each request label contains the information needed to identify its
source OC-48c linecard.
•
•
•
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
151
PMC [ PMC-SIERRA, INC ]
