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
Megabit Modem CRA-C User Manual | 1 |