The Caller IDs work on two technologies DTMF and FSK. FSK(frequency shif keying) technology is used in United States and some other Dual Tone Multi Frequency (DTMF) is employed in India and some other countries.
Usually Indians try to get cordless phones or caller IDs from abroad, mainly from US where the caller ID works on FSK. Those phones when installed in India won't show the caller information because in India the caller information is send over DTMF. But don't worry there is a work around for this problem. You can buy a Caller ID converter, which is basically a DTMF to FSK converter (which cost around Rs 300-400/-) and connect your phone / Caller ID through this device.
If you are using ADSL broad band net connection through the same phone line then connect the converter only after the ADSL splitter.
I may suggest to go for CallerIDs or phones that support both FSK and DTMF in that case it will work in all places.
Another issue that you might face will be the power adopter. Phones from US may have the adopter for 100-120V, but in India we require 220-240V adopter. Usually we will try to get another adopter for that device from some shops and they may charge us more. I may suggest to go for a voltage converter (basically a stepdown transformer) for 20VA (depending on your phones load, Just multiply the input voltage and current marked on the adopter for example 100-120V 100mA in that case 120 * 0.1 = 12VA) so go for 20-30VA converter). Do not buy replacement adopters from the local market, if the output is not regulated properly your device may fail or the batteries may go bad. I will suggest to go for a voltage converter so that you can use the original power adopter and the expense for the converter will be less.
I got a 25VA voltage converter for 100 bugs and a Caller ID converter for 400 bugs from SP road, Bangalore, India
Saturday, April 30, 2011
Airtel issues and concerns and solutions
If you are not satisfied with the support of Airtel Customer care then walk-in to the nearest Airtel Relationship Center (ARC), if you are still not satisfied then speak to the Nodal Officer and if still your problem is not solved then speak to the Applet officer.
Please do not send mails to these officers they are too slow to respond. Call them up. The Applet / Nodal officer numbers for your area is available in Airtel web site.
I am happy with the support and service from the Applet and Nodal officers. My SIM got blocked as it was not used for long time. I have contacted the customer care and walked into the nearest ARC. My address proof and request to reactivate the SIM were taken at ARC and I have waited for 2 weeks, there was no outcome and my SIM got deleted and my mobile number was send for recycling. I came to know about the Nodal officer and got the number of Kerala Nodal Officer. I called them up and raised my concern. They told me to submit my address proof again, I have done the same and waited for a week but no outcome. I agree that that Nodal officer have done their level best. Finally I called up Applet officer, by that time activating my old SIM became difficult and I was asked to get a duplicate SIM. I again walked into the next ARC and they told that SIM is not available. I really appreciate the efforts of Applet fooicers Rahul and Johnson. Rahul contacted the ARC and told them to issue a SIM urgently from the reserved stock. Finally I got the SIM and after lot of efforts from the Applet officers and from my side I got my mobile number back.
I am really happy that the number that I got the number back that was deleted and given for recycling...
So buddies please don't wait for long believing the Customer Care and ARCs just call the APPLET OFFICER / NODAL OFFICER
Please do not send mails to these officers they are too slow to respond. Call them up. The Applet / Nodal officer numbers for your area is available in Airtel web site.
I am happy with the support and service from the Applet and Nodal officers. My SIM got blocked as it was not used for long time. I have contacted the customer care and walked into the nearest ARC. My address proof and request to reactivate the SIM were taken at ARC and I have waited for 2 weeks, there was no outcome and my SIM got deleted and my mobile number was send for recycling. I came to know about the Nodal officer and got the number of Kerala Nodal Officer. I called them up and raised my concern. They told me to submit my address proof again, I have done the same and waited for a week but no outcome. I agree that that Nodal officer have done their level best. Finally I called up Applet officer, by that time activating my old SIM became difficult and I was asked to get a duplicate SIM. I again walked into the next ARC and they told that SIM is not available. I really appreciate the efforts of Applet fooicers Rahul and Johnson. Rahul contacted the ARC and told them to issue a SIM urgently from the reserved stock. Finally I got the SIM and after lot of efforts from the Applet officers and from my side I got my mobile number back.
I am really happy that the number that I got the number back that was deleted and given for recycling...
So buddies please don't wait for long believing the Customer Care and ARCs just call the APPLET OFFICER / NODAL OFFICER
Wednesday, December 1, 2010
UPS MOSFETS burns out quiet frequently
Reasons
1) A heavy non linear load is connected to the output (Like Fans, pumps, etc)
It is advised not to connective heavy inductive loads to the UPS(see the manuals)
2) The transformer may have gone bad.(Needs to give the output transformer for lamination / servicing). Please verify if the transformer is getting heavily heated up.
3) The UPS micro circuits / microcontroller controlling the bridges that feed the transformer have some issues.
4) The UPS switching section might not be working properly. When the mains fails the UPS will go to inverter mode, when the mains restores the ups returns to the mains mode while the inverter side is still ON (This issue will happen to some locally designed UPS only) this causes the mains to flow back to the MOSFET through the transformer that causes the MOSFET to overload and will burn out.
5) Ensure that the heat sinking is proper and heat sink compound is is applied propely between the MOSFET and the heat sink and the MOSFET is properly fixed to the heatsink.
1) A heavy non linear load is connected to the output (Like Fans, pumps, etc)
It is advised not to connective heavy inductive loads to the UPS(see the manuals)
2) The transformer may have gone bad.(Needs to give the output transformer for lamination / servicing). Please verify if the transformer is getting heavily heated up.
3) The UPS micro circuits / microcontroller controlling the bridges that feed the transformer have some issues.
4) The UPS switching section might not be working properly. When the mains fails the UPS will go to inverter mode, when the mains restores the ups returns to the mains mode while the inverter side is still ON (This issue will happen to some locally designed UPS only) this causes the mains to flow back to the MOSFET through the transformer that causes the MOSFET to overload and will burn out.
5) Ensure that the heat sinking is proper and heat sink compound is is applied propely between the MOSFET and the heat sink and the MOSFET is properly fixed to the heatsink.
Humming sound coming from UPS when running in inverter mode(on batteries)
Please ensure whether the humming is observed only when the ups is running on batteries. If so then the issue might be related to the filter kept at the output stage after the transformer. (In Some UPS the filter might be directly fixed to the mains outlet on the Plug socket back side). Please ensure that the connections are perfect and the capacitor is working properly
How to get wireless MAC address of Nokia E72
Issue: How to get the wireless MAC ID of nokia E72.
Solution dial *#62209526#
Solution dial *#62209526#
Network Issue
issue: When I connect laptop / computer to the network (long cable) I am not able to access websites or network devices properly. When I ping to the remote device on the network I am getting request timed out in between proper replies.
Solution: The issue is related to your network cabling, when operating at high speed say 100Mbps and 1Gbps speed please make sure that the cabling standards are met and the length of the cable won't exceed the maximum recommended length. The quick solution for this issue is to run the network at a low speed if possible (From the network properties in the windows XP) and select 10Mbps full duplex mode instead of 100Mbps. If you still need a higher speed then use good quality of cable in proper CAT-5 / CAT-6 standards.
If the length of the cable exceeds the maximum length then try using repeaters (you can use another hub in between as a repeater).
If you can compromise on the speed then the easy solution is to operate at a low data rate (10Mbps)
Solution: The issue is related to your network cabling, when operating at high speed say 100Mbps and 1Gbps speed please make sure that the cabling standards are met and the length of the cable won't exceed the maximum recommended length. The quick solution for this issue is to run the network at a low speed if possible (From the network properties in the windows XP) and select 10Mbps full duplex mode instead of 100Mbps. If you still need a higher speed then use good quality of cable in proper CAT-5 / CAT-6 standards.
If the length of the cable exceeds the maximum length then try using repeaters (you can use another hub in between as a repeater).
If you can compromise on the speed then the easy solution is to operate at a low data rate (10Mbps)
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