ADC CRA-C - Manual (Page 9)

Megabit Modem CRA-C User Manual 1
ABOUT THE MEGABIT MODEM CRA-C
The PairGain ® Megabit Modem™ CRA-C uses Asymmetric Digital
Subscriber Line (ADSL) technology to provide, on a single pair telephone line,
a multi-megabit Ethernet connection between the subscriber and the service
provider. The Megabit Modem CRA-C transmits data up to 3.16 Mbps from a
service provider and receives data up to 1.08 Mbps from a subscriber. The
Megabit Modem CRA-C is rate adaptive; its speed is adjusted to the maximum
attainable data rate depending on distance and line condition. Additionally,
ADSL technology allows ordinary telephone service to coexist with the
high-speed data service on the same wire pair.
The rate-adaptive Megabit Modem allows the service provider to deliver the
best possible data rate for any subscriber. Typically, a subscriber closest to the
provider receives the highest data rate available, while subscribers farther
away receive data at a lower transmission rate.
The Megabit Modem CRA-C has field-proven Carrierless
Amplitude-modulation and Phase-modulation (CAP) line coding.
The 2-dimensional, 8-state Trellis coding with Viterbi decoding and
the Reed-Solomon forward-error-correction provide robust transmission
in harsh environments.
Use the Megabit Modem CRA-C for application solutions, particularly those
requiring high-speed transmission to the subscriber, such as:
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Internet access
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remote Local Area Network (LAN) access
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telecommuting
• small office or home office
Other features of the Megabit Modem CRA-C include:
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embedded Simple Network Management Protocol (SNMP) agent
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IEEE 802.1d transparent MAC level bridging with Spanning Tree
protocol support
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static IP routing to provide secure access to the Internet
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BOOTP and TFTP to download software
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10BASE-T Ethernet port for connection to an Ethernet LAN
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line port for Rate-adaptive ADSL single-pair connection
• console port for maintenance and management