MITEL MT90866AL, MT90866AG Datasheet

MT90866

WAN Access Switch

Product Brief

Features

• 3.3V operation with 5V tolerant inputs and I/O’s

• 2,432 x 2,432 channel non-blocking switching among local streams

• 4,096 x 2,432 channel blocking switching between backplane and local streams

• 2,048 x 2,048 channel non-blocking switching among backplane streams

• Rate conversion between backplane and local streams

• Rate conversion among local streams

• Backplane interface accepts data rates of

8.192Mb/s or 16.384Mb/s

• Local interface accepts data rates of 2.048Mb/ s, 4.096Mb/s or 8.192Mb/s

• Sub-rate switching (2 or 4 bits) conﬁguration for local streams at a data rate of 2.048Mb/s

• Per-channel variable or constant throughput delay

• Fully compliant to H.110 Timing speciﬁcations

• Automatic frame offset delay measurement for backplane streams

• Per-stream input frame delay offset, up to 128 bytes, programmable for local streams on a per quarter bit or per channel basis

• Per-stream output frame advancement, programmable for backplane and local streams

• Per-channel direction control for backplane streams

• Per-channel message mode for backplane and local streams

• Per-channel high impedance output control for backplane and local streams

• Pseudo-Random Binary Sequence (PRBS) pattern generation and testing for backplane and local streams

• 5V tolerant PCI driver on CT-Bus I/O’s

• Integrated PLL, compatible to Stratum 4 Enhanced clock switching standard

• Non-multiplexed microprocessor interface

• Connection memory block programming for fast device initialization

• Tristate-control outputs for external drivers

• Conform to the mandatory requirements of the IEEE-1149.1 (JTAG) standard

DS5279 ISSUE 2 Feburary 2000

Ordering Information

MT90866AL 256 Pin LQFP MT90866AG 240 Pin LBGA

-40°C to +85°C

Applications

• Multi-service access platforms

• CTI applications

• Gateways, Integrated Access Devices

• ST-BUS and H.110 interface applications

Description

The MT90866 Digital Switch provides switching capacities of 4,096 x 2,432 channels between backplane and local streams, 2,432 x 2,432 channels among local streams and 2,048 x 2,048 channels among backplane streams. The local connected serial inputs and outputs have 32, 64 and 128 64kb/s channels per frame with data rates of

2.048, 4.096 and 8.192Mb/s respectively. The backplane connected serial inputs and outputs have 128 and 256 64kb/s channels per frame with data rates of 8.192 and 16.384Mb/s respectively.

The MT90866 also offers a sub-rate switching conﬁguration which allows 2-bit wide 16kb/s or 4-bit wide 32kb/s data channels to be switched within the device.

The device has features that are programmable on per-stream or per-channel basis including message mode, input delay offset, output advancement offset, direction control and high impedance output control.

MT90866 Preliminary Information

STio0

STio31

BCSTo

C20i TM1 TM2 SG1

AT1

DT1

RESET

C64BYPS

Backplane

Interface

S/P

P/S

Converter

HiZ

Control

APLL

FAIL_A

C8_A_io

FRAME_A_io

DPLL

FAIL_B

C8_B_io

FRAME_B_io

Backplane Data Memory

(4,096 channels)

Local Connection Memory

(2,432 locations)

Output

Mux

LREF0-7

PRI_LOS

SEC_LOS

C32o

NREFo

CTREF2

CTREF1

Local Data Memory

(2,432 channels)

Backplane Connection Memory

(4,096 locations)

Internal Registers &

Microprocessor Interface

C1M5o

A13-A0

DTA

Output

Mux

D15-D0

ODE

Local

Interface

P/S

Converter

HiZ

Control

Local

Interface

S/P

Converter

Local Interface

Timing Unit

Test Port

TMS

TCK

TDi_SCANi

TDo_SCANo

STo0

STo27 LCSTo

STi0

STi27

ST_FPo ST_CKo

IDDQ_EN

TRST

Figure 1 - Functional Block Diagram

Application Overview

The MT90866 is intended for carrier-grade applications that require high bandwidth switching capability. With compliance to the ECTF H.110 speciﬁcation, it is also suitable for using a compact PCI platform.

While the Computer Telephony Interface (CTI) industry is adopting the compact PCI platform over VME, many manufacturers of telecom and datacom equipment are also selecting this platform. The compact PCI platform offers attractive features such as hot swappable cards, integrated PCI and H.110 TDM buses, and a rugged backplane and mechanical design. This new standard is replacing the older ribbon-cable based bus standards such as MVIP-90, H-MVIP and SCbus.

Carrier-grade access, switching platforms, wireless base stations, and gateways (i.e. VOIP) may handle multiple T1/E1, DS-3 or OC-3 streams for connection to the WAN or PSTN. Multiple lower bandwidth interfaces are consolidated into these higher bandwidth pipes for networking into a WAN or PSTN.

While these types of equipment serve different applications and markets, many share a similar type

of internal architecture. Frequently, a mid-plane or backplane conﬁguration is used, which may accommodate a TDM bus, for compatibility to TDM interfaces (ISDN, Sonet, T1/E1, etc.), and a PCI bus, for interfacing to LAN networks and the IP network. In many cases, a Utopia bus may be present if ATM is used as an uplink to the WAN or PSTN. Interfacing into this midplane or backplane would be lower bandwidth subscriber linecards and higher bandwidth WAN uplink linecards.

By locating TDM switching on the linecard itself, as opposed to a centralized switching card, system designers employ a distributed switching arrangement. In this case, the MT90866 allows for local to backplane switching of DS-0 trafﬁc from trunks or local connection such as internal DSP cards (compression, echo cancellation, modem termination). Unique to the industry, the MT90866 provides backplane switching, eliminating the need to move the trafﬁc to the local streams and back. This feature allows users to move trafﬁc among the backplane traces for routing to other destinations.

On the uplink linecard side, the MT90866 allows the users to interface to multiple T1 or E1 or DS-3 or OC-3 ports. With the ability to take 2,432 channels from 4,096 channels on the backplane and to switch

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