I had an TM822 telephony modem and the technician installed an additional CM820. Now they are side by side, with the TM822 still handling the telephone and the CM820 handling the router. I have 50 Mbps service and was not planning to upgrade.
For the life of me, I can't figure out how this improves my system. Any ideas?
http://www.arris.com/products/touchstone-cable-modem-cm820/
Details for Touchstone Cable Modem CM820
Flexible NxM downstream/upstream channel bonding for superior throughput
Two independent 96MHz wide RF tuners to receive downstream channels up to 1GHz
Built in MoCA® immunity filter
Downstream scanning override via web GUI for rapid installation
Supports Business Services over DOCSIS
CM820A DOCSIS 3.0 compliant
CM820B and CM820S dual-mode EuroDOCSIS 3.0 / DOCSIS® 3.0 compliant
CM820C Japanese DOCSIS 3.0 compliant
8x4 downstream/upstream channel-bonding with superior throughput
Dual 96MHz wide downstream tuners
Backwards compatible with DOCSIS 1.0, 1.1, and 2.0
IPv4 or IPv6 addressing modes for DOCSIS CM layer
10/100/1000 Base-T Ethernet interface
http://www.arris.com/products/touchstone-e-mta-tm822/
Details for Touchstone E-MTA TM822
Toll grade voice performance equal to the industry leading TM602/TM722 family of products
Two independent 96MHz wide RF tuners to receive downstream channels up to 1GHz
Configurable options for loop current, loop voltage management, and ringing waveform
Loop Diagnostics for remote testing and troubleshooting of in-house wiring
Advanced Diagnostics for easy troubleshooting - Call Quality Metrics for last fifty (50) calls
DOCSIS 3.0 compliant
PacketCable ® 1.0 and 1.5 compliant
PacketCable ® 2.0 support with firmware upgrade
Flexible 8x4 downstream/upstream channel-bonding with superior throughput
Backwards compatible with DOCSIS 1.0, 1.1, and 2.0
Up to two lines of carrier-grade VoIP
Multiple Protocol Support: PacketCable (NCS) or Session Initiation Protocol (SIP)
IPv4 or IPv6 addressing modes for DOCSIS CM layer
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