XRT95L34 Datasheet, PDF (1/2 Pages) Exar Corporation – OC-12/STM-4, QUAD OC-3/STM-1 POS/ATM FRAMER WITH INTEGRATED CDR’S

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PRELIMINARY
XRT95L34
OC-12/STM-4, QUAD OC-3/STM-1 POS/ATM FRAMER WITH INTEGRATED CDR’S
MARCH 2002
REV. P1.0.0
GENERAL DESCRIPTION
The XRT95L34 is an OC-12/STM-4, Quad OC-3/
STM-1 POS/ATM Framer with integrated CDR’s. ATM
direct mapping and cell delineation are supported, so
are packets (PPP) over SONET for POS mapping
and frame processing. The XRT95L34 contains an in-
tegral SONET framer which provides framing and er-
ror accumulation in accordance with ANSI/ITU-T
specifications. The configuration of this device is
through internal registers accessible via an 8-bit par-
allel, memory mapped, microprocessor interface.
APPLICATIONS
• Edge and WAN ATM Switches
• IP Routers, Packet Switches and Hubs
• Multi-protocol Switches
FEATURES
• A single chip solution for ATM UNI and packet over
SONET
• Provides the highest level of protection switching
flexibility for up to 1:14 protected OC-3/STM-1
ports.
• Provides quad serial OC-3/STM-1 interfaces with
integrated CDR, compatible with industry standard
optical modules.
• Provides serial OC-12/STM-4 interfaces with inte-
grated CDR, compatible with industry standard
optical modules.
• Supports the mappings for any standard combina-
tion of STS-12c/AU-4c or STS-3c/AU4.
• Provides four 8-bit busses on the line side running
at 19.44 MHz to connect OC-12 framers through a
parallel interface or aggregate four low speed OC-3
devices into an OC-12 line.
• Supports both SONET and SDH on all interfaces.
SONET/SDH is programmable per interface.
• Terminates Section Overhead, Line Overhead and
STS-Path Overhead on 4xOC-3, 1xOC-12 inter-
faces. Supports performance monitoring and
alarms required by GR.253, G.707 and ANSI
T1.105.
• Provides SONET frame scrambling and de-scram-
bling.
• Supports 50 msecond APS by monitoring and filter-
ing K1 and K2 bytes as required by the standards.
• Offers differential line interfaces.
• Offers multiple microprocessor compatible interface
- Intel, Motorola, PowerPC, Mips.
• Provides 8/16-bit data UTOPIA level II Interface and
POS interface.
• Includes ATM cell or PPP packet Mapping.
• Single +3.3V power supply with +5V input toler-
ance.
SONET TRANSMITTER
• Performs standard OC-3c/STM-1c transmit pro-
cessing.
• Conforms to ITU-T I.432, ANSI T1.105, and
Bellcore-253.
SONET RECEIVER
• Performs standard STS-12/STS-3c/STM-1c receive
processing.
• Conforms to ITU-T I.432, ANSI T1.105, and
Bellcore-253.
HIGH SPEED INTERFACE
• Quad serial OC-3/STM-1 PECL interfaces with inte-
grated CDR, compatible with industry standard
optical modules.
• Single serial OC-12/STM-4 PECL interface with
integrated CDR, compatible with industry standard
optical modules.
LOW SPEED INTERFACE
• Complies with ATM forum Utopia Level 2 Specifica-
tion
• Supports 8/16-bit 50MHz transmit and receive
interface.
• Provides up to total 16 cell buffers for transmit and
receive.
MICROPROCESSOR INTERFACE
• Supports standard 8-bit micro-controllers with Intel
or Motorola style interfaces.
• ·33 MHz read and write access.
• Provides burst bus transfers.
• Provides DMA controller interface for OAM buffer
interface.
• Separated and multiplexed data/address bus.
• Both write-clear and reset-upon-read for control of
status registers.
• Provides interrupts for alarm processing.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com