Description TAAD Lite provides flexible network-interface solutio
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TAAD08JU21BCL-L3A (TAAD Lite) T1/E1/J1 AProcessor, Versions
Description
TAAD Lite provides flexible network-interface solution next-generation applications which efficient transport narrowband voice broadband data information critical guaranteeing network user transmission efficiency network operator. Constructed using Agere's 0.16 CMOS technology, chip integrated octal framer, processor, cell scheduler router, AAL2/5 functions. TAAD Lite operates either mode (selectable per-span line basis). complete AF-PHY0086.001 management information base (MIB) supported. Flexible provisioning link group combinations enables mappings various services.
Support AAL2 provided AAL/CPS function that maps/demaps variable-sized packets to/from ATM-SDU. total 1024 bidirectional CIDs supported. These CIDs transported within programmable number direction. TAAD Lite supports AAL2 VCs, which allocated between ingress egress traffic. Support high-speed data switching provided whereby AAL5 routed through system interface toward their destinations. TAAD Lite provides support 2032 bidirectional AAL5 internal context memory. Integrated policing; F4/F5 operations, administration, maintenance (OAM); cell processing; statistics collection performance monitoring also provided. Communication with TAAD Lite through 32-bit microprocessor interface. system interface through UTOPIA interface with support both 8-bit 16-bit data width UTOPIA-derived packet interface with support both 8-bit 16-bit data widths.
System-on-a-chip integrated circuit supports lowspeed Aaccess next-generation wireless base transmission station (BTS), base station controller (BSC), node-B, radio network controller (RNC), remote access concentrator (RAC) applications. provides integrated octal framer that supports T1/E1/J1formats. Supports inverse multiplexing A(IMA) over selected group link mappings ranging from four two-link groups eight-link group AForum AF-PHY-0086.001. Integrates Aadaptation layer (AAL2) (AAL5) segmentation reassembly (SAR) function support low-speed data voice traffic I.363.2 I.363.5, respectively. Provides quality service (QoS) connection identifier (CID) multiplexing I.366.1. Enables Alayer user network interface (UNI) mode, selectable per-link basis flexible transport delay critical voice data traffic. Guarantees variety traffic types (including delay-sensitive voice, real-time data, non-real-time data, signaling information) through advanced hierarchical three-level priority scheduler per-VC queueing. Supports 1024 bidirectional AAL2 CIDs. Supports 2032 bidirectional high-speed data connections virtual circuits (VCs) embedded context memory; filters control cells accepts control cells host microprocessor interface. On-board memory used connection management queue data storage. external memory needed. Software package includes following: Device manager source code (C-based device manager ready-to-use with host RTOS). Setup file utility provision TAAD Lite. Firmware embedded controller (executable binary). Designed 0.16 low-power CMOS technology. digital compatibility; core power enhanced ball-grid array (EBGA) package temperature range
TAAD Lite provides complete Aaccess function from AAL/CPS mapping functions (for AAL2 through ATM/TC/PHY layers. highly integrated, flexible architecture results unified features, simpler operation, best-in-class operation with respect area, power, function.
TAAD08JU21BCL-L3A (TAAD Lite) T1/E1/J1 AProcessor, Versions
Block Diagram
UTOPIA EXPANSION INTERFACE
TAAD LITE
SWITCH FABRIC SYSTEM INTERFACE
LINE INTERFACE
FRAMER ENGINE
INTERFACE
HOST PROCESSOR INTERFACE
Figure Architecture TAAD Lite Device seen Figure TAAD Lite provides complete Alow-speed access function. comparison current alternative devices, TAAD Lite provides framing, transmission convergence, inverse multiplexing ATM, Aport management, SARing functions single, highly integrated device. Furthermore, TAAD Lite architected flexible scalable effectively handle alternative higher-rate physical interfaces. TAAD Lite provides following features highly integrated system chip (SOC):
complete, integrated, low-speed Aaccess device solution. Flexible solution transporting mixed traffic classes with guarantees. System-on-a-chip performance with simpler OAMP enhance time-to-market.
TAAD Lite terminates variety low-speed physical link protocols (T1/E1/J1) integrated framer. Each link carry Acell streams corresponding multiple connections. Transmission convergence (TC) provides cell delineation through generation checking. also provides cell rate decoupling between Aand layers through insertion/discard idle Acells. block provides inverse multiplexing over Ausing four groups with eight links group. Aport controller (APC) block provides functionality Agere device, such switching, traffic shaping, policing. engine provides number segmentation reassembly options based AAL2 AAL5 standards while maintaining multiple traffic classes qualities service.
Functional Overview
Depending upon provisioned mode operation, cell stream associated with link treated Auser network interface (UNI) combined along with several other links associated with inverse multiplexing over A(IMA) group. block provided terminate protocol. Aservice access point (SAP) effectively provided between Alayers internal UTOPIA-2 multi-PHY (MPHY) interface associated control logic. Alayer functions such that connection management, scheduling, buffer management, statistics gathering provided Aport controller (APC) block, modified version Agere Atlanta® device. ATM-SAP also provided between Aand layers internal UTOPIA interface associated control logic. engine adapts service-specific convergence sublayer (SSCS) packets into Acells, supporting both AAL2 AAL5 protocols. engine includes class-of-service multiplexing enable single AAL2 transport connections different traffic types. Agere Systems
TAAD08JU21BCL-L3A (TAAD Lite) T1/E1/J1 AProcessor, Versions
Functional Overview (continued)
Finally, SSCS packet exchanged with destination SSCS entity system interface operating modes. TAAD Lite's system interface supports following:
Standard UTOPIA level (also known UT2) cell-based MPHY master port. UTOPIA level plus packet-over-SONET (also known UT2+) MPHY master port.
Underlying this system-on-chip implementation embedded device controller (EDC) that provides intelligent higher-level interface provisioning monitoring well alarm correlation statistics gathering. This higher-level, command-based interface simplifies integration TAAD Lite into systems reducing firmware development efforts.
Receive Direction Data Flow
This section describes basic operation TAAD Lite data received from T1/E1/J1 line interface (shown left side Figure processed TAAD Lite. Layer TAAD Lite receive cells from either low-speed interfaces (T1, high-speed interfaces (155 Mbits/s) following:
Eight T1/E1/J1 span line interface ports UTOPIA-2 8-bit MPHY port that bypasses framer, functions.
Low-Speed Links case low-speed interfaces, TAAD Lite enables flexible link assignments either mode per-link basis. This provisioning capability enables users isolate delay-sensitive traffic from delay-insensitive traffic steering time-critical traffic flows onto mode links while carrying other data mode links. TAAD Lite1BCLS2-DB's scheduler views each logical link independently, whether logical link consists single physical link (UNI mode) multiple physical links (IMA mode group). mode selected, link also assigned group. TAAD Lite's scheduler also guarantee bandwidth real-time-critical traffic while mode (since Alayer processing independent layers). TAAD Lite's eight physical ports configured configuration links groups with four groups. TAAD Lite also provides capability switch nxDS0 channels to/from span lines from/to concentrated highway interface (CHI) time-division multiplexed (TDM) legacy applications. This provides ability share bandwidth span line between Aand traffic. High-Speed Links TAAD Lite provides ability connect high-speed external PHY/TC framer device directly Alayer functions UTOPIA expansion port. This port operate MHz. this path, internal framer engine, blocks bypassed. This high-speed expansion port used combination with low- medium-speed links. Note: This expansion port also used Aservice access point connections system devices. UTOPIA expansion operates 16-bit data widths.
Agere Systems Inc.
TAAD08JU21BCL-L3A (TAAD Lite) T1/E1/J1 AProcessor, Versions
Functional Overview (continued)
Layers data received framer, delineates data into time slots bytes then passes data blocks. determines proper Acell boundaries. cells then passed block. When receiving data from TC/IMA blocks, determines which logical link data received based MPHY addressing presented block. block provides ability group multiple physical low-speed links into single logical high-speed link, approximately equal bandwidth individual low-speed links (less protocol overhead). four groups specified TAAD Lite, ranging from minimum links group maximum eight links group. effect group reduce transmission latency long packets (corresponding high-speed bursts) increasing apparent bandwidth available data flow. enables network operator scale transport capacity higher bandwidth flows more granular without having more expensive excess capacity. That multiple T1/E1 links added demand grows, rather than receive direction, block detects link failures automatically rebalances offered load transmit direction) across remaining good links. block provides indication failed link block type backpressure redistribute offered load over smaller bandwidth remaining good links. data (cells) currently being transmitted over link necessarily lost cannot retransmitted across other links. block removes IMA-protocol-specific cells from cell stream receive direction) verifies protocol across each group's links. Thus, only data stream cells transferred between blocks. TAAD Lite provides these protocol checking functions autonomously (via block) without requiring intervention external host device. ALayer Receive Alayer functions such connection management, header look-up translation, ingress queueing, OAM, performance-monitoring processing provided block, which derived from standardproduct Agere device. receive direction, cells transferred from UTOPIA-2 interface. this case, block provides UTOPIA-2 master function poll cells from PHYs. block buffers cells prevent cell loss buffer overrun block) determines egress destination port cell. block switch cell several destinations, follows:
egress ports block processed sent host interface Atlanta switch fabric ports connected switch fabric interface
Within TAAD Lite, block provides novel architecture which ingress egress internal data buffer space shared across links engine. This enables TAAD Lite route cells from span line another span line based Acell header add/drop multiplexer-like ATM-based switch function. destination port determined header look-up into internal context memory. Engine engine receives cells from Alayer (APC block) UTOPIA-2 bus. master. Data transferred from block, block, external source UTOPIA expansion interface, into UTOPIA-2 bus. Cells then transferred engine. Following processing, cells packets forwarded their destination system interface.
Agere System
TAAD08JU21BCL-L3A (TAAD Lite) T1/E1/J1 AProcessor, Versions
Functional Overview (continued)
Alternatively, cells could received switch fabric interface. this mode, data enters block switch fabric port then exits UTOPIA-2 engine. From there processed sent system interface egress system packets, just previously illustrated flow. engine provides following types services, based upon SSCS entity pertaining connection:
AAL5 reassembly AAL2/I.366.1 frame reassembly from AAL2 packets AAL2 demultiplexing case short packets)
addition, system interface cell-based UTOPIA-2 MPHY, engine demultiplex packets from AAL2 into AAL0 cells that AAL2 connections routed different destinations within system. packets cells forwarded system interface port operating modes:
UTOPIA-2 (cell transfer) UTOPIA-2+ (packet transfer)
engine provides class-of-service packet scheduling onto system interface port distribute service different types traffic weighted round-robin scheduler. engine provides quality-of-service scheduling onto both system network interfaces distribute service different types traffic hierarchy schedulers. engine also detect that certain packets (CPS-SDUs reassembled AAL5 packets) destined external host device. this case, engine transfers packet buffer access external host TAAD Lite's device manager. Embedded Device Controller embedded device controller (EDC) consists microcontroller that manages general operation other blocks communicates with external host interface.
Transmit Direction Data Flow
transmit direction refers data transfer from system interface/switch fabric interface/host microprocessor, through TAAD Lite, through network interface. SSCS/AAL Layer Interaction Data exchanged with link received from system interface, Atlanta switch fabric interface, external host microprocessor, UTOPIA expansion port Data from system interface formatted cells packets. case cell stream, TAAD Lite's engine provide AAL0 CPS-packet AAL2 multiplexing; AAL5 cells passed directly Alayer. case packet stream, TAAD Lite's engine programmed provide following processing (via engine):
AAL5 segmentation AAL2/I.366.1 frame SARing into AAL2 packets AAL2 multiplexing case short packets) AAL2 class-of-service scheduling (when multiple traffic classes share common AAL2
Agere Systems Inc.
TAAD08JU21BCL-L3A (TAAD Lite) T1/E1/J1 AProcessor, Versions
Functional Overview (continued)
Data from Atlanta switch fabric switched engine (for AAL0 AAL2 multiplexing AAL2 AAL0 demultiplexing) then link. Also, data transferred from system interface through engine routed switch fabric interface. Data from external host microprocessor undergo either following:
AAL5 SARing SSCOP service AAL2 multiplexing packet AAL2/I.366.1 SARing
ALayer block performs normal queue management scheduling basis) corresponding destination link speed. block moves cells block APC_TX_Egress UTOPIA where MPHY determines destination cell either four group PHYs eight PHYs. UTOPIA-2 block acts master, while UTOPIA-2 block acts slave. Alternatively, block schedule delivery external PHY/TC expansion UTOPIA-2 MPHY port. Again, UTOPIA master. IMA/TC Layer block receives cell from block internal UTOPIA determines destination port from MPHY address. MPHY address indicates group, block routes cell stream appropriate group state machine, which distributes cells round-robin fashion across subtending links. filler cells inserted under control block, based frame synchronization Alayer traffic rates. case link, cells routed from Alayer (APC macrocell) directly bypassing processing. transmit direction, block views groups links independent logical paths. Thus, block schedules traffic onto j-th logical Mbits/s Mbits/s) link; case link. Data transferred between IMA/TC block UTOPIA-2 MPHY where each group link constitutes single-destination PHY. block schedules flows onto maximum eight PHYs (corresponding eight links) minimum (corresponding single eight-link group). block framer block interface function. Thus, block provides ability block issue/receive cells directly to/from framer when links provisioned mode. this case, each such link provisioned mode. Layer Cells mapped onto associated link based frame type (T1, J1). Direct mapping used cells octet-aligned fashion into frame payload.
Agere System
TAAD08JU21BCL-L3A (TAAD Lite) T1/E1/J1 AProcessor, Versions
ApplicationTAAD Lite used several applications where low-speed Aaccess required. Target applications include following:
network interface termination Voice traffic over A(VToA) trunking application Low-speed Aaccess AAL2 crossconnect
following subsections describe TAAD Lite each these applications.
Network Interface Termination
network interface termination, TAAD Lite provides several useful features. First, third-generation systems require Atransport variety traffic types, including compressed speech, video, data, signaling information. TAAD Lite supports this through features such AAL2 AAL5 transport, AAL2 multiplexing/demultiplexing, scheduling. AAL2 especially useful these wireless systems because most speech packets short packets, AAL2 enables multiplexing several such packets into single Acell, realizing efficient transmission BSC. example, assuming CDMA-based EVRC speech compression algorithm, from user connections supported single T1/E1 span line. Moreover, each user connections pertain unique channel element (within BTS) must demultiplexed from into individual packets. TAAD Lite provides this function mapping AAL-CIDs into AAL0 cells forwarding cells destination modem channel card. Third-generation wireless systems also anticipate higher user access speeds, ranging Mbits/s. frame, this corresponds ~5000 octets user. Typically, such data will transported ATM/AAL5 flows with different requirements, depending source data.
SPANS
MODEM CARD
LOW-SPEED
TAAD LITE
5-9971(F)
Figure Application TAAD Lite supports this data traffic passing through AAL5 cells (which will reassembled their destination) with corresponding egress scheduling utilizing scheduling services. Moreover, such traffic tends bursty, maximum latency requirements ensure delivery time soft-hand-off diversity combining. TAAD Lite supports this need block, which reduces transport latency long packets while allowing reduced operating costs requiring migration higher-speed transport links (since such traffic bursty such pipes tend underutilized).
Agere System
TAAD08JU21BCL-L3A (TAAD Lite) T1/E1/J1 AProcessor, Versions
Applications (continued)
Finally, wireless application necessitates economic efficient interconnection microcell picocell sites that overall transport costs minimized. Typically, this ensured either daisy-chaining BTSs concentrating traffic gateway application. TAAD Lite supports this need through internal prioritizing passthrough traffic switching daisy-chain application) through Adrop-and-insert feature utilizing APC's switching capabilities. TAAD Lite further supports such topologies with egress system interface UTOPIA2 MPHY that enables routing traffic multiple destinations gateway application).
PSTN
Figure BTSs Require Function
IN-BUILDING PICOCELL CONFIGURATION
GATEWAY CONTROLLER 8-T1/E1 SPAN LINES TAAD LITE HDLS UTOPIA
Figure Gateway Controller
VToA Trunking Application
Typically, used transport services such voice services AAL1. However, low-speed access traffic, AAL1 inefficient cell header overhead. ATM/AAL1 either multiple samples kbits/s) pertaining single connection (with 5.875 worth speech) multiple samples pertaining multiple connections single Acell. Agere System
TAAD08JU21BCL-L3A (TAAD Lite) T1/E1/J1 AProcessor, Versions
Applications (continued)
However, efficient VToA provided efficiently transporting compressed speech. this application, speech first compressed, possibly utilizing silence-interval suppression. Then speech packet multiplexed into utilizing AAL2. TAAD Lite supports this application normal AAL2 cross connect mode, which cells forwarded TAAD Lite from DSPs compressed into AAL2 TAAD Lite. This relieves from having provide transport protocol processing. Note: interworking function provided between TAAD Lite speech packets into ATM. example, could used. However, concentration voice packets into should performed close egress port possible maximum statistical multiplexing across many sources. This TAAD Lite provides advantage over localized stat-MUXing single card. Also, most SARs provide AAL2 support.
T1/E1 Kbits/s PSTN FRAMER
VARIABLE LENGTH PACKETS AAL0 CELLS
T1/E1 ATM/AAL2 COMPRESSED VOICE
FRAMER
UTOPIA
TAAD LITE
FRAMER
Figure Remote Access Concentrator Application
EDGE SWITCH LOW-SPEED ASWITCH HIGHSPEED C-A
SPANS
TAAD LITE
C-A
C-A
Figure Edge/Access Switch Application
Low-Speed AAccesIn this application, data from variety sources multiplexed into AAL2 using I.366.1 MUXing. I.366.1 pertains only type defines SSCS, CPCS, services necessary mapping larger packets (e.g., octets) to/from AAL2 VCs. TAAD Lite provides support I.366.1 concentration enable Atransport variety low-speed services.
Agere Systems Inc.
TAAD08JU21BCL-L3A (TAAD Lite) T1/E1/J1 AProcessor, Versions
Applications (continued)
AAL2 Cross Connect
switching provided following architecture. (west) TAAD Lite device terminates AAL2 demultiplexes CIDs from into AAL0 cells, routes AAL0 cells through space switch fabric second (east) TAAD Lite device. east TAAD Lite device accepts AAL0 cells, relates them specific AAL2 VCs, maps SSCS into CIDs subsequently into AAL2 onto physical transmission link. TAAD Lite thus function scalable AAL2 cross connect expansion ports (cell) switching fabric.
TAAD LITE (WEST) (SWITCH FABRIC/ ASE) AAL2 VC_2 CIDs: TAAD LITE (WEST) AAL0 VC_E AAL0 VC_F AAL0 VC_G Note: East CIDs need match west CIDs. TAAD LITE (EAST) AAL2 VC_4 CIDs: TAAD LITE (EAST)
AAL2 VC_1 CIDs:
AAL2 VC_3 CIDs:
Figure AAL2 Cross Connect fashion similar stand-alone Aswitching configuration, TAAD Lite provide stand-alone AAL2 cross connect, illustrated Figure
AAL2 CIDs: TAAD LITE AAL2 CIDs:
5-9977(F)
Figure Stand-Alone AAL2 Cross Connect
additional information, contact your Agere Systems Account Manager following: INTERNET: http://www.agere.com E-MAIL: docmaster@agere.com AMERICA: Agere Systems Inc., Lehigh Valley Central Campus, Room 10A-301C, 1110 American Parkway Allentown, 18109-9138 1-800-372-2447, 610-712-4106 CANADA: 1-800-553-2448, 610-712-4106) ASIA: Agere Systems Hong Kong Ltd., Suites 3201 3210-12, 32/F, Tower Gateway, Harbour City, Kowloon Tel. (852) 3129-2000, (852) 3129-2020 CHINA: (86) 21-5047-1212 (Shanghai), (86) 755-25881122 (Shenzhen) JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 6778-8833, TAIWAN: (886) 2-2725-5858 (Taipei) EUROPE: Tel. (44) 1344
Agere Systems Inc. reserves right make changes product(s) information contained herein without notice. liability assumed result their application. Agere, Agere Systems, Agere logo trademarks Agere Systems Inc. Atlanta registered trademark Agere Systems Inc.
Copyright 2003 Agere Systems Inc. Rights Reserved Printed U.S.A.
2003 PB03-131A
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