PRELIMINARY
MARCH 2007
METROXS
REV. P1.0.0
INDUSTRY-FIRST, 5G MULTI-SERVICE ACCESS PLATFORM
GENERAL DESCRIPTION
MetroXS is a complete carrier class 5G multi-service
access reference design that achieves Ethernet &
Resilient Packet Ring (RPR) transport over SONET/
SDH networks. MetroXS is composed of several
market-proven Exar devices: the EXtendAR 48
(XRT95L53) multi-protocol framer, and Exar's OC-48/
STM-16 SONET/SDH PHY (XRT91L80), plus a
channelized 5G Resilient Packet Ring (RPR) MAC,
and 4 GE/24 FE port Ethernet aggregator. In addition,
MetroXS includes Exar's unified software API
structure enabling system vendors to port their
innovative applications on this platform with ease.
The hardware supports point-to-point or ring network
configuration for the efficient and cost effective
transport of packet data. The data path of processing
elements is defined by a MPoS mapper (the
XRT95L53), a 5G BW RPR-MAC, and a 4-port triple-
rate Ethernet aggregation device. The RPR-MAC
east-side client port is sourced from the Ethernet
aggregator while the un-occupied client port may be
sourced from a third party network processor. The
configuration and control of these data-path
processing elements is performed with an MPC866
SBC hosting embedded Linux 2.6.
The MetroXS software comprises of a suite of
embedded Linux 2.6 low-level device drivers and OS
transparent API for configuration and control of the
data-path. The stacked architecture lends itself for
easy portability of the device drivers and API across
other OS platforms. A PC hosted GUI client
communicates over a 10/100Base-Tx link with the
MetroXS CLI shim layer over the API. The software
suite also supports a diagnostic back-door serial port
during bring-up and debug for future system level
enhancements.
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Software:
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Full suite of software:
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Embedded Linux 2.6 Low level drivers
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API for configuring and controlling Client, RMAC
& Transport
Optional higher layer software to implement a full-
featured RPR system
Highly portable software
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Platform independent API
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OS adaptation layer features
FEATURES
CLIENT SIDE FEATURES
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4 10/100/1000 Base-Tx copper ports
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IEEE 802.3x Flow control including jumbo frames
IEEE 802.1p Class of service, priority protocols
IEEE 802.3ad link aggregation
IEEE 802.1ad VLAN Stacking
Flexible BW Oversubscription up to 4:1 using
MDRR scheduling algorithm
Class of Service, CoS per port identified by
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IEEE 802.1Q VLAN tagging
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IEEE 802.1p with 8 queues per port
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IP DSCP field
Port based ingress traffic policing using TRTCM with
a granularity of 64Kbps
WRED based scheduling algorithm per queue
Port-based egress traffic shaping in 64Kbps steps
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Traffic Engineering & QoS
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Extensive RMON statistics
TRANSPORT FEATURES
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Supports 2xOC-48 SONET/SDH rings
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Sub 50ms of failure recovery
PDUs:
ATM,
BENEFITS
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Best of SONET and Ethernet:
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Efficient
transport for multi-protocol
Ethernet, LAPS, PPP, HDLC, GFP-F
bandwidth provisioning using VCAT/LCAS
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Compliant to G.7042 next-gen SONET/SDH for dynamic
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Support
for GR-253 compliant alarms and performance
monitoring RPR FEATURES
Fair access to ring bandwidth
Guaranteed BW allocation to high priority traffic
50 ms ring protection
Optimized and cost-effective for data/cell based
traffic
TDM services with flexible and dynamic provisioning
Efficient transport of PDU traffic over NG SONET/
SDH
MEF E-Line Services
MEF E-LAN services
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Flexible architecture supports multiple services:
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Compliant to IEEE 802.17
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RPR node Topology Database, 256 entries
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Supports Steering, and ringlet selection
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Supports 4 Class of Service
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Class A0 (guaranteed bandwidth) & A1
Class B: B-CIR and B-EIR
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Supports rate limiting of Class A, B-CIR, B-EIR, C
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
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(510) 668-7000
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FAX (510) 668-7017
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www.exar.com
METRO XS
PRELIMINARY
REV. P1.0.0
INDUSTRY-FIRST, 5G MULTI-SERVICE ACCESS PLATFORM
•
Separate shapers for 4 Classes
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Supports Spatial reuse
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Support wrap and steer protection with WTR < 50 ms
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Each ringlet can support bandwidth of 2.5 Gbps
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Client side add/drop of 5 Gbps
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Provide counters for unicast, multicast, broadcast frame
and byte counters for 4 Classes
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RS232 DB-9 Serial craft port
Collateral supplied:
REFERENCE DESIGN
Hardware includes XRT95L53 (MPoS Framer), XRT91L80
(SONET PHY),RPR-MAC, Ethernet Aggr Mux with a
MPC866 PPC SBC using embedded Linux 2.6 and
associated drivers. The box is shipped with the following
interfaces:
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H/W Schematics
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Board PCB Layout
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Board Design Guidelines
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Quick User’s Guide
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S/W API Documents
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Datasheets for each device
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XRT95L53
XRT91L80
RPR-MAC
Ethernet Aggr Mux
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Clients: 4 GE RJ-45 copper ports
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Network Trunk: 2xOC-48 rings
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10/100 RJ-45 Management port
F
IGURE
1. B
LOCK
D
IAGRAM OF
XRT91L82
Sheet Metal Enclosure:
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1 RU, 19" Rack mountable
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PRELIMINARY
REV. P1.0.0
METRO XS
INDUSTRY-FIRST, 5G MULTI-SERVICE ACCESS PLATFORM
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to
improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation that
the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration
purposes and may vary depending upon a user’s specific application. While the information in this publication
has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the
failure or malfunction of the product can reasonably be expected to cause failure of the life support system or
to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless
EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has
been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately
protected under the circumstances.
Copyright 2007 EXAR Corporation
Datasheet March 2007.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
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