Product Overview

The PM8620 NSE 20G is a monolithic CMOS integrated circuit that performs DS0 and above granularity Space (cross bar) switching on 32 full duplex STS-12 streams.

The device provides 20 Gbit/s (258,048 DS0s; 10,752 T1s/VT1.5s; 8064 E1s/VT2s; 384 DS3s/E3s) switching.

The NSE 20G can be combined in applications with the PM5372 TSE and the PM5310 TBS devices from the PMC-Sierra CHESS(TM) product family and with the PM8610 SBS and the PM8611 SBSLITE.


  • Supports 32 STS-12 equivalent serial ports via 777.6 MHz, 8B/10B encoded LVDS links. Each port can be either Serial TelecomBus or Serial SBI336S.
  • In SBI mode, switches DS0 or NxDS0 for all T1 and E1 tributaries and aggregate columns for switching T1, E1, VT1.5, VT2, DS3 and E3 tributaries.
  • The NSE 20G can be used with the companion SBS devices to implement a switch fabric scaleable to 20 Gbit/s.
  • In TelecomBus, switches VT1.5, VT2, or STS-1 tributaries.
  • Supports switching of arbitrary non-standard octet aggregates.
  • Supports unicast, multicast, and broadcast for all switching modes.
  • Supports full-duplex, in-band communication channels from the NSE to each SBS or SBSLITE device. These channels can be used to initialize and control the SBS's for fabric monitoring and maintenance.
  • Supports "1+1" or "1:n" fabric redundancy in conjunction with the SBS or SBSLITE devices.
  • Supports two sets of switch settings and a controlled method of changing settings on STS-12 frame boundaries.


  • Supports an IEEE P1149.1 JTAG test port.
  • Provides a 32-bit microprocessor bus interface for configuration, control and status monitoring.
  • Low power 1.8 V / 3.3 V 0.18 µm CMOS technology.
  • Available in a high density 480-ball 35x35 mm UBGA.
  • -40 °C to +85 °C Industrial Temperature Operation.

Typical Applications include:

  • T1/E1 SONET/SDH Cross-connects.
  • T1/E1 SONET/SDH Add-Drop Multiplexers.
  • OC-48 Multiservice Access Multiplexers.
  • Channelized OC-12/OC-48 Any Service Any Port Switches.
  • Voice Gateways.

Are you seeing all your results?

If you are a PMC-Sierra Customer or Partner you may have permission
to see additional results on the myPMC product page.
Please log in to the myPMC product page to check.

Product Brief
      Version Issue Date
  PDF Document 20G Narrow Band Switch Element Short Form Data Sheet [52 kB] PMC-2000171 4 2001-08-08
Data Sheet
      Version Issue Date
Locked PDF Document NSE-20G ASSP Telecom Standard Product Data Sheet [794 KB] PMC-2000170 6 2009-04-30
      Version Issue Date
Locked PDF Document NSE 20G Device Errata [59 KB] PMC-2021311 3 2004-11-03
Locked PDF Document NSE-20G Device Errata Revision B [127 kB] PMC-2020527 1 2002-05-17
Software Documentation
      Version Issue Date
Locked PDF Document NSE/SBS Narrowband Chipset Driver User's Manual [1.25 MB] PMC-2021248 1 2002-09-19
Locked PDF Document NSE Device Driver Manual [763 kB] PMC-2010053 2 2002-08-15
      Version Issue Date
Locked Compressed Document CHESS-Narrowband Chipset Driver [621 kB] PMC-2021239 beta 1.0 2002-09-18
Locked Compressed Document NSE-20G and NSE-8G Device Driver [149 kB] PMC-2012383 rel 1.0 2002-08-15
Application Note
      Version Issue Date
Locked PDF Document Implementing SDH SNCP and SONET UPSR with the TUPP 2488 and NSE 20G Devices [304 KB] PMC-2021985 2 2004-07-15
Locked PDF Document Knowledge Base Items for the PM8620 NSE-20G [557 kB] PMC-2020408 2004-07-05
Locked PDF Document Cable Length Characterization for Narrowband Devices [121 KB] PMC-2020248 1 2002-07-04
Locked PDF Document Meeting ETSI EN 300 417-1-1 and 4-1 Requirements With the TUPP-2488 and NSE-20G [326 kB] PMC-2021687 1 2002-10-11
Locked PDF Document Meeting ANSI T1.105 Requirements With the TUPP-2488 and NSE-20G [189 kB] PMC-2021686 1 2002-09-30
Locked PDF Document Meeting GR-1400-Core Requirements With the TUPP-2488 and NSE-20G [318 kB] PMC-2021562 1 2002-09-18
Locked PDF Document Meeting GR-253-Core Requirements With the TUPP-2488 and NSE-20G [362 kB] PMC-2021538 1 2002-09-18
Locked PDF Document Meeting ITU-T G.783 Requirements With the TUPP-2488 and NSE-20G [285 kB] PMC-2021602 1 2002-09-18
Locked PDF Document CHESS J0/C1 Synchronization and Clock/Frame Pulse Distribution Application Note [415 kB] PMC-2020559 1 2002-11-21
Locked PDF Document CHESS-Narrowband Open Path Algorithm API Design Specification [1.54 MB] PMC-2010601 2 2002-09-19
Locked PDF Document NSE-20G Programmers Guide [378 kB] PMC-2011554 1 2001-10-11
Locked PDF Document NSE Board Design Consideration Application Note [465 kB] PMC-2011099 1 2001-07-18
Technical Overview
      Version Issue Date
Locked PDF Document CHESS Narrowband Chip Set Technical Overview [1.30 MB] PMC-2010865 1 2002-08-01
BSDL Files
      Version Issue Date
  Text Document Boundary Scan Description Language (BSDL) Source Code for the PM8620 NSE-20G Revision B Device [20 kB] PMC-2011785 1 2002-05-03