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Adelphia strongly recommends users that are looking to purchase and/or use their own modem get a DOCSIS 2.0 compatible model from the current recommend modem list.
Adelphia's official recommended modem list can be found here:
It has been found that not all modems, even newer DOCSIS 2.0 modems such as the Motorola SB5120, will currently support Adelphia's Extreme tier's (16000/2000) bandwidth.
An Extreme approved list is also available and can currently be found on this notice: