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MT90500
2
Applications
B-ISDN (Broadband ISDN) systems requiring
flexible N x 64kbps transport
Connecting TDM backplane to TDM backplane
over ATM network (GO-MVIP MC4, or other)
Systems requiring ANSI T1.630 Structured
Data Transfer services for 1 to 122 TDM
channels per VC
Systems requiring ITU-T I.363.1 circuit
transport over Structured Data Transfer for 1 to
96 TDM channels per VC
Systems requiring AF-VTOA-0078.000 (ATM
Forum CES v2.0) “Logical Nx64 Basic Service”
Systems requiring AF-VTOA-0083.000 Voice
and Telephony over ATM (CBR-AAL5).
Mapping between CBR-AAL0, CBR-AAL5, and
AAL1
Mapping between CBR partially-filled cells and
full cells
Mapping between CBR single-voice cells and
Nx64 cells
ATM uplink for expansion of COs, PBXs, or
open switching platforms using an adjunct ATM
switch
ATM Public Network access for PBX or CO
ATM Edge Switches and CPE Integrated-
Access over ATM
TDM traffic transfer over an asynchronous cell
bus
Systems requiring Nx64 over CBR-AAL5.
Description
The MT90500 Multi-Channel AAL1 SAR is a highly
integrated solution which allows systems based on a
telecom bus to be interfaced to ATM networks using
ATM Adaptation Layer 1 (AAL1), ATM Adaptation
Layer 5 (AAL5) and ATM Adaptation Layer 0 (AAL0).
The MT90500 can be connected directly to a ST-BUS
time
division
multiplexed
containing up to 1024 full duplex 64kbps channels.
Up to 1024 bi-directional ATM VC connections can
be simultaneously processed by the MT90500 AAL1
SAR device.
(TDM)
backplane
On the synchronous TDM bus side, the MT90500
device interfaces with sixteen bidirectional ST-BUS
serial links operating at 2.048, 4.096 or 8.192 Mbps.
TDM bus compatibility with MVIP-90, H-MVIP, and
SCSA interfaces is also provided.
On the ATM interface side, the MT90500 device
meets the ATM Forum standard UTOPIA Bus Level
1. This supports connection to a range of standard
physical layer (PHY) transceivers.
The MT90500 provides a built-in UTOPIA multiplexer
which allows external ATM cells to be multiplexed
with internally-generated cells in the transmit
direction. This feature can be used to connect
another MT90500 (to expand the TDM bandwidth of
the system to 4096 TDM channels), or to connect an
external AAL5 SAR (to multiplex non-CBR ATM cell
traffic with the MT90500 CBR stream).
Figure B - MT90500 Device Application Block Diagram
MT90500
AAL1 SAR
TDM Data, Clock
and Sync Lines
MVIP-90
H-MVIP
IDL
ST-BUS
Off-the-shelf
SAR Device
(AAL5)
Local Memory
Off-the-shelf
ATM PHY
Device
UTOPIA
Port
External
Synchronous
SRAM
CPU
16-bit CPU port for
internal register and
external memory pro-
gramming
Primary
UTOPIA
Port
Secondary