The MT90520 8-Port Primary Rate Circuit Emulation AAL1 SAR allows primary rate TDM circuits to be carried over ATM networks using Circuit Emulation Services. Up to 256 bi-directional ATM VC connections can be simultaneously processed by the MT90520 CES AAL1 SAR device.

Features & Benefits

• AAL1 Segmentation and Reassembly device compliant with Circuit Emulation Services (CES) standard (af-vtoa-0078.000)
• Supports both Unstructured and Structured Circuit Emulation of 8 independent DS1/E1/STBUS interfaces
• Supports AAL1 trunking, with up to 128 TDM channels per VC (af-vtoa-0089.001)
• Supports CAS transmission and reception in all structured modes of operation
• Supports simultaneous processing of up to 256 bidirectional Virtual Circuits
• Supports mixed DS1/E1 operation
• Supports mixed Unstructured and Structured CES operation
• Fully flexible DS0 assignment
• Complete clock recovery solution provided onchip: Synchronous, Adaptive, or Synchronous Residual Time Stamp (SRTS) via 8 independent PLLs
• Dual-mode (ATM-end or PHY-end) UTOPIA port operates in Level 1 or Level 2 mode for connection to external PHY or ATM devices with UTOPIA clock rate up to 52 MHz

Documentation

• mt90520-datasheet-aug2006.pdf

Design Manuals

Software Manuals

• mt90528-api-spec-porting-guide-nov2003.pdf
• mt90528-api-spec-jan2004.pdf

Product Previews

• sar-product-preview.pdf
• mt90520-28-product-preview.pdf

Downloads, Firmware and Drivers

BSDL Files:
• mt90520ag.bsd

Typical Applications

• B-ISDN (Broadband ISDN) systems requiring flexible N x 64 kbps transport
• Systems requiring af-vtoa-0078.000 (ATM Forum CES v2.0) "DS1 or E1 Nx64 Basic Service", "DS1 or E1 Nx64 Service with CAS", or "DS1 or E1 Unstructured Service" - flexible CES allows one-board solution to support multiple CES modes
• Systems requiring af-vtoa-0089.001 (ATM Forum - ATM Trunking Using AAL1 for Narrowband Services) - transport of up to 129 channels per VC
• DSLAM
• IAD
• Voice gateway
• NGDLC
• ATM Public Network access for PBX or CO

Product Packaging & Availability

Part Number	Package Type	Pin Count	Lead-Free Option	Shipping Option(s)	Lead Time(wks)	Status

Packaging Information

• Soldering Profiles
• Moisture Sensitivity
• Shelf Life
• Reliability Data

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