So, now we know what you want
- One should match the chipset of DSLAM to the chipset of the modem for beat compatibility
- However, one may go for a device with a Broadcom's chipset as these supposedly handle noise better
- Some (wifi ac mostly) wireless routers don't have a dsl modem, so, depending upon your usage, you may have to buy 2 devices ... ASUS and Netgear might be good choices depending upon your budget
- If you are unsure, it would be best to get one from PTCL with a known brand like Sagem, Huawei, ZyXel, Tenda ...
Note: A lot depends upon the condition of the line! Over here, there is a sync rate limit imposed by PTCL unlike other places that use Target SNR Margins and so no difference is likely to be experienced on a good line between different modems! Other things of note might include Operating Temperature (need for extra cooling and ventilation during summers) and the quality of the power supply (can it be run on UPS, generator, etc... though most Power Supplies are made to run on pure sinewave only)