MT90866
V
DD
V
SS
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
2
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
MITEL [ MITEL NETWORKS CORPORATION ]
