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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:
Internet access
remote Local Area Network (LAN) access
telecommuting
•
small office or home office
Other features of the Megabit Modem CRA-C include:
embedded Simple Network Management Protocol (SNMP) agent
IEEE 802.1d transparent MAC level bridging with Spanning Tree
protocol support
static IP routing to provide secure access to the Internet
BOOTP and TFTP to download software
10BASE-T Ethernet port for connection to an Ethernet LAN
line port for Rate-adaptive ADSL single-pair connection
•
console port for maintenance and management