MacBook Pro's wireless connectivity with ZTE 531 ADSL modem using BSNL broadband

I have tried to connect macbook pro with BSNL broadband internet connection using ZTE 531 ADSL modem. The connection using both wireless mode and ethernet mode failed repeatedly. Using the same modem, I am able to connect to internet through my Sony Viao running Windows 8 and HP630 running ubuntu (both in wireless mode and ethernet mode). I have tried the 'assist me->diagnostics' option in Macbook's network diagnostics. The first 4 indicators are green, but the remaining 2 (ISP and server) remains yellow. Repeated attempts were made by restarting the modem.
Surprisingly, the Macbook works fine with a newly purchased Dlink N150 ADSL2 modem. I have used the same WIFI settings ( as in the ZTE modem) in Dlink modem also. What could be the reason for this ?

Hello jayan_a_r,
From what you are talking about, it seems like you have done some good troubleshooting to attempt to sort it out. Try using a different Network Location as sometimes that could be an issue when trying to access the internet. Also make sure that modem is using the recommended settings for the wireless access.
Using network locations (Mac OS X v10.6 and later)
http://support.apple.com/en-us/HT5289
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/en-us/HT4199
Regards,
-Norm G.

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