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just wanted to ask someone if they know of this modem? does it perform better then the one used for for internet only, or does this one run slower because it is used by the telephone and cable? plz let me know, oh ya this is used by comcast cable

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Short answer for : a telephony-capable Arris cable modem does not automatically run slower just because it also carries phone traffic. Voice (VoIP) uses very little bandwidth and providers normally prioritize it. What actually determines raw internet speed is the modem hardware and DOCSIS capabilities (DOCSIS version and how many downstream/upstream channels it supports), and whether the unit is a modem-only device or a gateway with a built-in router/Wi-Fi.

If you want to check real performance, post the exact Arris model from the sticker and we can compare specs. Quick tests you can run now: connect a PC directly by Ethernet (disable the gateway router or use bridge mode) and run a speed test; repeat while a call is active to see any change. If wired speeds are fine but wireless is slow, the gateway Wi-Fi or NAT is likely the bottleneck and using a separate router can help. Also note: telephony features must be supported and provisioned by Comcast (many cable voice services use the PacketCable standard), so the phone ports only work if the provider enables them.

, modems are still required to get you onto the cable network. If you post the Arris model number I will compare its DOCSIS/channel specs and give specific guidance on expected throughput and whether the voice function will affect your internet.

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Member Avatar for joshSCH

Never heard of it. Modems are out-of-date.

Member Avatar for Doc3107

cablae modem for high speed internet, that's what I meant

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