鈥?/div>
payload header suppression offloads system CPU,
giving higher overall system performance.
Extraction of bandwidth requests and DOCSIS MAC
management messages allows software to access these
messages without examining data packets.
Class-based queuing allows traffic prioritization:
鈥?High, medium, and low priority downstream queues.
鈥?High priority, low priority, request, and MAC management
upstream queues.
one downstream
鈥?/div>
Supports simultaneously and up to six upstream
channels
鈥?Many other downstream-to-upstream ratios can be achieved by
connecting multiple BCM3212 devices via the seamless MAP
master/slave interface
400,000 packets
the
鈥?/div>
Processes up toall upstream andper second in channels
aggregate over
downstream
鈥?/div>
Direct interface to:
advanced universal QAM modulator
鈥?BCM3034 QAMLink
廬
(providing downstream data rates up to 100 Mbps)
鈥?BCM3138 QAMLink
廬
dual-channel advanced PHY burst
receiver (providing upstream data rates up to 30 Mbps per
upstream channel)
鈥?/div>
Support for carrier class redundancy via timestamp
synchronization across multiple BCM3212 devices.
high
rates for maximum utilization of
鈥?/div>
Supports cablepacketbandwidth.
available
plant
鈥?/div>
Out-of-band (OOB) generator for messaging to
BCM3352-based cable modems.
remoted from
routing/classification
鈥?/div>
Can befor distributed external(mini fiber node)
engine
CMTS
鈥?/div>
鈥?/div>
鈥?/div>
applications.
SPI master port controls register interface to
BCM3034 and BCM3138 devices.
Packaged in an 841-pin, thermally enhanced plastic
ball grid array.
Operates over industrial temperature range (鈥?0 to
+85 degrees C) PCI bus.
鈥?/div>
Packet port provides a high-throughput data interface
to other network equipment via the standard IEEE
鈥?/div>
鈥?/div>
802.3z GMII Ethernet interface
PCI interface to external host CPU supports either 32-
bit or 64-bit operation at either 33 MHz or 66 MHz
PROPANE
TM
packet acceleration and SMART
SPECTRUM
TM
technologies included for increased
upstream performance
Typical Application Block Diagram
Upstream
Analog Inputs
BCM3138
Dual Adv. TDMA
Receiver
Upstream
SDRAM
(keys and
reassembly.)
Upstream
SDRAM
(PHS,
output
queues)
BCM3138
BCM3138
Ethernet
Routing/
Classification
Engine
WAN
BCM3212
Advanced CMTS MAC
System
CPU
PCI Bus
Downstream
Analog Inputs
BCM3034
Downstream
Modulator
Downstream
SDRAM
(PHS,
output
queues)
Memory
BCM3212相關(guān)型號(hào)PDF文件下載
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英文版
QAMLINK UNIVERSAL MODULATOR
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Communication Miscellaneous
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