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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 triplerate 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.
* Software:

Full suite of software: Embedded Linux 2.6 Low level drivers API for configuring and controlling Client, RMAC & Transport Optional higher layer software to implement a fullfeatured RPR system Highly portable software Platform independent API OS adaptation layer features
FEATURES CLIENT SIDE FEATURES
*
4 10/100/1000 Base-Tx copper ports

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 IEEE 802.1Q VLAN tagging IEEE 802.1p with 8 queues per port 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
* Traffic Engineering & QoS

* Extensive RMON statistics
TRANSPORT FEATURES
* Supports 2xOC-48 SONET/SDH rings
Sub 50ms of failure recovery PDUs: ATM,
BENEFITS * Best of SONET and Ethernet:

* Efficient
transport for multi-protocol Ethernet, LAPS, PPP, HDLC, GFP-F bandwidth provisioning using VCAT/LCAS
* Compliant to G.7042 next-gen SONET/SDH for dynamic * 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
* Flexible architecture supports multiple services:

* Compliant to IEEE 802.17 * RPR node Topology Database, 256 entries * Supports Steering, and ringlet selection * Supports 4 Class of Service

Class A0 (guaranteed bandwidth) & A1 Class B: B-CIR and B-EIR
* Supports rate limiting of Class A, B-CIR, B-EIR, C
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510) 668-7000 * FAX (510) 668-7017 * www.exar.com
METRO XS
PRELIMINARY
REV. P1.0.0
INDUSTRY-FIRST, 5G MULTI-SERVICE ACCESS PLATFORM
* Separate shapers for 4 Classes * Supports Spatial reuse * Support wrap and steer protection with WTR < 50 ms * Each ringlet can support bandwidth of 2.5 Gbps * Client side add/drop of 5 Gbps * Provide counters for unicast, multicast, broadcast frame
and byte counters for 4 Classes
* 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:
* H/W Schematics * Board PCB Layout * Board Design Guidelines * Quick User's Guide * S/W API Documents * Datasheets for each device

XRT95L53 XRT91L80 RPR-MAC Ethernet Aggr Mux
* Clients: 4 GE RJ-45 copper ports * Network Trunk: 2xOC-48 rings * 10/100 RJ-45 Management port
FIGURE 1. BLOCK DIAGRAM OF XRT91L82
Sheet Metal Enclosure:
* 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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