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Can anybody say me how to configure Huawei Sterlite MT841 Wireless Router with Tata Indicom Connection?

I had BSNL Internet connection, BSNL gave me Huawei Sterlite MT841 Router which have Wireless (WIFI) also. BSNL had lots of problems so I withdrew their connection and opted for TATA Indicom Broadband. TATA Indicom Broadband gave me Telenet Tndsl 2120 Router. Now the problem is Telenet Tndsl 2120 Router doesn't have Wireless (WIFI). Now i want to shift TATA connection into Huawei Sterlite MT841 Router as it has WIFI. Now, I connected Huawei Sterlite MT841 Router with the TATA connection (ADSL and Firewire), WIFI gets connected successfully too BUT no Internet connection is happening, rite now i have reseted/formated/made it come to factory settings the Huawei Sterlite MT841 Router. Now can you say me exactly what settings is to be configured in Huawei Sterlite MT841 Router for the TATA connection?

I saw the below links :

[url]http://www.indiabroadband.net/bsnl-broadband/1180-how-configure-bsnl-type-iv-mt841-modem-autodail-wireless-setup.html[/url]
[url]http://www.indiabroadband.net/tata-indicom-broadband/6148-tata-indicom-telenet-tndsl-2120-router-linksys-wireless-router-settings.html[/url]
[url]http://www.indiabroadband.net/tata-indicom-broadband/6148-tata-indicom-telenet-tndsl-2120-router-linksys-wireless-router-settings.html&cd=1&hl=en&ct=clnk&gl=in[/url]
Question: Can a non-BSNL user buy an ADSL Modem from BSNL - India Broadband Forum
MT-841 (Type-IV) ADSL MODEM MULTIUSER CONFIGURATION
Wireless Modem

But as you can see they are for different routers and connections, not supporting the connection and router I want (TATA Indicom Broadband and Huawei Sterlite MT841 Wireless Router)

I would want to see full configuration (WIFI) for Huawei Sterlite MT841 to get it working with TATA Indicom Connection

For me WIFI is very very necessary

SO PLZ HHHHEEEELLLLLLPPPPPPPPPPPPPPPPPPP !!!!!!!!!!!!!!!!!

Thanx !!