MT90866AL datasheet(2/6 Pages) MITEL

2 / 6 page

MT90866

Preliminary Information

Application Overview

The

MT90866

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

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

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

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

Figure 1 - Functional Block Diagram

STi0

STi27

Test Port

Output

Mux

Backplane Data Memory

VSS

VDD

RESET

Interface

Backplane

Converter

P/S

S/P

C20i

STo0

STo27

LCSTo

(4,096 channels)

Local Connection Memory

IDDQ_EN

ODE

P/S

Converter

Local

Interface

S/P

Converter

Local

Interface

STio0

STio31

(2,432 locations)

Local Data Memory

(2,432 channels)

Backplane Connection Memory

(4,096 locations)

Internal Registers &

Microprocessor Interface

Output

Mux

APLL

DPLL

C64BYPS

AT1

DT1

TM1

TM2

SG1

BCSTo

HiZ

Control

HiZ

Control

Local Interface

Timing Unit

ST_FPo

ST_CKo

MT90866AL Datasheet(PDF) 2 Page - Mitel Networks Corporation

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