D-Link GLB 502T
One of the worst modems in market according to my peers.
Features
High-speed Internet access via one WAN port on the existing phone line, connecting to a group of users via an Ethernet switch
ADSL line Internet sharing
Built-in ADSL interface with widest range of DSLAM interoperability ADSL (ANSI T1.413 issue 2, G.dmt Annex A, G.lite Annex A) compliant 1 10/100BASE-TX LAN port, 1 USB 1.1 port for connection to a workstation Virtual Private Network (
VPN) pass-through support DMZ and Virtual Server Mapping support Web-based configuration
PPPoE, Point-to-Point Protocol over Ethernet, is a
network protocol for
encapsulating Point-to-Point Protocol (PPP) frames inside
Ethernet frames. It is used mainly with
ADSL services where individual users connect to the
ADSL transceiver (modem) over Ethernet and in plain
Metro Ethernet networks.(Wiki)
Maybe due to line problem.Or any wireless or other electro magnetic field emitting equipments(e.g.Cordless,Mobile,Speakers etc) should be kept at a reasonable distance as they can interfere with the signal in line.
People usually complain that USB connectivity with the modem is very poor it gets disconnected every 10 min or so. if u use Ethernet sync it to 10mbps
I should recommend you to get a MTNL
router as they replace if u have any fault.
Wait for others to reply to your problems they may have better explanations