PM8621-BI PMC-Sierra, Inc., PM8621-BI Datasheet - Page 22

• Manufacturer Part Number: PM8621-BI
• Description: Driver, NSE/SBS Narrowband Chipset Driver
• Manufacturer: PMC-Sierra, Inc.

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Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2021248, Issue 1
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The NSE/SBS narrowband chipset forms a time-space-time switching fabric capable of cross
connecting traffic down to DS0 granularity. It scales the existing SBI family products from OC-3
rates to OC-12 and OC-48 rates for the Any-Service-Any-Port type (ASAP) multi-service
equipment. The chipset not only supports SBI bus devices but also TeleCombus devices. In SBI
mode, it provides DS0 granularity time-space-time switching fabric and in TeleCombus mode, it
provides a VT1.5/VT2 (TU-11/TU-12) granularity. The chipset also provides a seamless
integration to the CHESS family of PMC-Sierra Inc. The addition of NSE/SBS to the CHESS-
enabled devices allows user to perform VT-level cross connect functions. Targeted applications
for the chipset include OC-48 ADM, and channelized OC-48/4xOC-12 ASAP architecture for
carrier class products.
The Narrowband Chipset Driver (CSD) presents a unified interface for the chipset under all
different configurations and provides a synchronized access and coordinated control over the
underlying devices (PM8620/1 NSE-20/8G, and PM8610/1 SBS/SBSLITE) for Narrowband
switching applications. The main functionality includes configuration of chipset devices,
connection setup/maintenance/teardown, 1:1 and 1:N port protection, and also UPSR protection.
In addition, the chipset driver is designed to handle various NSE/SBS switching fabric
configurations including multi-stage fabric architecture that supports higher bandwidth traffic
(Note: The CSD software is designed and implemented to accommodate 1- or 3-stage fabrics;
however, the OPA library is implemented to support only 1-stage fabric. Therefore, only 1-stage
fabric is currently supported).
Figure 1: NSE/SBS Switching Fabric - Centralized System Model
The chipset driver provides a high level of abstraction to the user for using the NSE/SBS
switching fabric. It is built on top of the following software components- the NSE and SBS
device drivers for accessing the underlying NSE and SBS devices, and the narrowband Open Path
Algorithm library (OPA Library). Central to this library is the open path algorithm (OPA) engine
that provides the intelligence for establishing calls and generating connection map settings for all
individual devices in the fabric.
ARROWBAND
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VERVIEW
SBS-Lite
SBS-Lite
SBS
SBS
Narrowband Chipset Device Driver Manual
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Narrowband Chipset Overview
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