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PDF TXC-05811 Data sheet ( Hoja de datos )
| Número de pieza | TXC-05811 | |
| Descripción | Port Expander | |
| Fabricantes | Transwitch | |
| Logotipo |  |
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ASPEN-PX Device
ASPEN Port Expander
TXC-05811
DATA SHEET
FEATURES
• Interoperable with ASPEN (TXC-05810B)
UTOPIA Level 2 interface
• Provides port expansion for up to 64 UTOPIA
Level 2 ports
• Utilizes ASPEN ATM AccessEDGE firmware for
design and field upgrades
• Supports unicast and spatial multicast traffic to all
64 ports
• Backpressure mechanism to prevent cell loss
• ASPEN-PX management integrated with ASPEN
via the host mailbox interface
• Single +3.3 V power supply
• 256-lead Plastic Ball Grid Array (PBGA) package,
17 mm x 17 mm
DESCRIPTION
The ASPEN-PX (TXC-05811), ASPEN Port Expander
provides state of the art UTOPIA port expansion
capability, increasing ASPEN’s PHY support from 16 to
64 ports with unicast and multicast traffic delivery to
enhance system flexibility. Its seamless interface with
ASPEN (TXC-05810B) enables customers to increase
the system port density of their CellBus-based UTOPIA
Level 2 platforms, and leverage existing ASPEN
hardware and software designs, reducing time-to-
market.
All traffic management for the 64 ports is handled directly
by ASPEN. Coupled with the ASPEN-PX, ASPEN
creates a new value proposition for the industry,
particularly in the broadband access market, by
extending the CellBus architecture to form a distributed
processing and switching environment that can directly
implement multi-service network functionality for ATM
cell-based traffic effectively and efficiently.
APPLICATIONS
DataShe•et4AUT.cMomAccess Multiplexers
• DSLAM Applications
• Multi-Service Access Multiplexers
• ATM LAN Switch
• VoIP/VoATM Voice Gateways
• Frame Relay Switch
DataShee
AUCLK ADCLK 32k x 32 SRAM
To ASPEN
UTOPIA Ports
(data and control)
UTOPIA 2 Port
ASPEN-PX
ASPEN Port Expander
TXC-05811
To 64 Subscriber
UTOPIA Ports
UTOPIA 2 Ports
Copyright 2003 TranSwitch Corporation
DataSheetT4rUan.Scwoimtch, TXC, ASPEN CellBus, PHAST are registered trademarks
of TranSwitch Corporation
Document Number:
PRELIMINARY TXC-05811-MB, Ed. 6
August 2003
TranSwitch Corporation • 3 Enterprise Drive • Shelton, Connecticut 06484 • USA
Tel: 203-929-8810 • Fax: 203-926-9453 • www.transwitch.com
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Proprietary TranSwitch Corporation Information for use Solely by its Customers
DATA SHEET
ASPEN-PX
TXC-05811
UTOPIA PORT MAPPING
The Multi-PHY addressing scheme outlined in the ATM Forum UTOPIA-2 standard, Appendix 1, example A1.1
is used by the ASPEN-PX. Each independent CLAV/ENB pair represents a 16-port group using the 5-bit UTO-
PIA address. This is illustrated in the following table:
Logical port number for
ASPEN header lookup
0 - 15
16 - 31
32 - 47
48 - 63
CLAV/ENB
Pair
0
1
2
3
Master UTOPIA address
Base_utopia_address + 15
Base_utopia_address + 15
Base_utopia_address + 15
Base_utopia_address + 15
INGRESS ATM HEADER LOOKUP
et4U.com
The ASPEN-PX appends 2 bytes to the 54 byte cell (total = 56 bytes) which encodes the source port in the
lower 6 bits. The upper 10 bits are padded 0s.
Cell Format from ASPEN-PX to ASPEN
UTOPIA 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Word
0
Pad = 0
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0
0
PHY ID
1 ATM Header[31:16]
2 ATM Header[15:0]
3 UDF1 (HEC)
UDF2 (Unused)
4 Payload byte 0
Payload byte 1
5 Payload byte 2
Payload byte 3
6 Payload byte 4
Payload byte 5
7 Payload byte 6
Payload byte 7
8 Payload byte 8
Payload byte 9
9 Payload byte 10
Payload byte 11
10 Payload byte 12
Payload byte 13
11 Payload byte 14
Payload byte 15
12 Payload byte 16
Payload byte 17
13 Payload byte 18
Payload byte 19
14 Payload byte 20
Payload byte 21
15 Payload byte 22
Payload byte 23
16 Payload byte 24
Payload byte 25
17 Payload byte 26
Payload byte 27
18 Payload byte 28
Payload byte 29
19 Payload byte 30
Payload byte 31
DataShee
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PRELIMINARY TXC-05811-MB, Ed. 6
August 2003
5 Page 
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Proprietary TranSwitch Corporation Information for use Solely by its Customers
DATA SHEET
ASPEN-PX
TXC-05811
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Upstream Data Flow
Subscriber traffic enters the ASPEN-PX through its 64-port UTOPIA interface where it is buffered in a 3-cell
Rate Decoupling FIFO (RDF). When a cell enters the RDF a 2-byte routing tag is prepended to the front of the
cell identifying the source port ID. The UTOPIA slave to ASPEN is immediately notified (as soon as the entire
cell has been stored) that a cell is available to be read out from the RDF. Cells written into the RDF are
immediately available to be clocked out the UTOPIA interface to the ASPEN. The ASPEN-PX and ASPEN use
UTOPIA address 0 for the user data port and UTOPIA address 1 for the ASPEN-PX control port. This insures
control path integrity under heavy traffic load conditions. If the user data port RDF fills, the master UTOPIA
interface must be notified to stop requesting cells from the subscriber PHYs until a cell slot becomes available
in the RDF. The ASPEN uses the prepended routing tag applied by ASPEN-PX to initiate a header lookup.
Downstream Data Flow
The ASPEN will maintain 256 unicast service category queues (4 per port), and 249 multicast queues. It also
maintains a congestion table which indicates congestion status for the multicast queue, and unicast queues.
Cells enter from the CellBus interface and are automatically enqueued by the Tandem Routing Header. Using
the outlet queue state and ASPEN-PX congestion status, the RP dequeues cells toward the ASPEN-PX. The
cells pass through the Outlet Processor, where they go through connection table lookup, header translation,
and statistics maintenance before having a routing tag prepended for use by the ASPEN-PX. The ASPEN-PX
uses the routing tag for final port queuing before forwarding traffic to the PHY device. The maximum traffic rate
recommended for a single-PHY device is 14 Mbit/s.
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PRELIMINARY TXC-05811-MB, Ed. 6
August 2003
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TXC-05811.PDF ] | |
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