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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 MT90866AG 256 Pin LQFP 240 Pin LBGA
-40C to +85C
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.
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MT90866
VDD VSS
Preliminary Information
ODE
STio0
Backplane Interface S/P & P/S Converter
Backplane Data Memory (4,096 channels)
Output Mux
Local Interface P/S Converter HiZ Control Local Interface S/P Converter Local Interface Timing Unit
STo0
STo27 LCSTo
Local Connection Memory (2,432 locations)
STio31
BCSTo C20i TM1 TM2 SG1 AT1 DT1 RESET C64BYPS
HiZ Control
STi0
Output Mux
Local Data Memory (2,432 channels)
STi27 ST_FPo ST_CKo
APLL
Backplane Connection Memory (4,096 locations)
DPLL
Internal Registers & Microprocessor Interface
Test Port
IDDQ_EN
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
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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
TMS TDi_SCANi TDo_SCANo TCK TRST
C8_A_io FRAME_A_io FAIL_A C8_B_io FRAME_B_io FAIL_B CTREF1 CTREF2 NREFo PRI_LOS SEC_LOS LREF0-7
C32o C1M5o
DS CS R/W A13-A0
DTA D15-D0
Preliminary Information
them to the local streams, the MT90866 satisfies these higher bandwidth applications. Depending on the application, the CPE or access equipment may need to terminate internet traffic and switch the traffic to the appropriate destination. Most of these applications employ banks of DSP's to handle the modem calls. When the local streams are used to route traffic to these DSP cards, the
MT90866
application requires a high local switching capability on each card. This requirement is easily handled by the MT90866, with its local switching capacity of 2, 432 channels.
Customer Premise Equipment PBX
Access
Network Core/Transport
Branch Gateway Analog Phones
10 Base T
Multiservice Access Concentrators
Carrier Class Switch
IP 10 Base T Edge Router Terabit Routers
Ethernet Phone
Enterprises IAD
ATM
ATM Edge Switch Residences Cable SOHO Gateway Base Stations Head End ATM Core Switches
Base Station Controller
Figure 2 - Typical Network Block Diagram
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MT90866
Mitel Component Local Loop Access: To subscribers/customers
T1/E1
Preliminary Information
Carrier Data Network Aggregation: To network/WAN
T1/E1
UTOPIA Backplane Packet Backplane TDM Backplane
T3/E3
T3/E3
SONET
SONET
ATM
ATM
ISDN
HDSL
PLL's

CPU
VEC's
DSP'S RAM
SWITCHING
Figure 3 - Carrier Multi-service Access Switch
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Preliminary Information
Notes:
MT90866
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