discoduncan

1) Hi can anybody tell me for any reason other than cost why I should use cat5e over the cable in the link below. http://www.ebay.co.uk/itm/CCTV-PTZ-Cable-Signal-Data-Power-all-one-PRO-/280817409032?pt=UK_CCTV&hash=item4162059c08 My installation scenario is a single ptz dome (maximum cable run of 15m) using pelco over rs485? 2) How do I know if the cameras on ebay which state that they are using sony effio HAD CCD chips actually are? My reason for this is why should I buy a vista premium priced (£400-£900) camera over a reasonably priced (£150-250) chinese made cam which uses a Sony chipset? Thanks for your answers.

Re Sony Chip: Once Ive opened up the dome Are all Sony Chips branded as so? @Soundy: I havent had a problem with Flea Bay yet and I would certainly request my money back if it wasnt a Sony chip and it was advertised as. I think I would probably buy from a uk seller who has already imported the items then if anything does go wrong its an easier complaints proceedure @jeromephone What does the awg mean? I agree with what your saying though I have calculated that two pair of cat5e are capable of carrying the load and the voltage drop is insignificant over the length that I am running. Thanks Again for all your answers both of you.

Thank you Soundy & Sector Security

Hi to all the contributers on the forum. I am based in the uk. I am thinking about buying a ptz dome camera the specs are on my sky drive follow the link below. https://skydrive.live.com/redir.aspx?cid=348b1014ca4f6157&resid=348B1014CA4F6157!148&parid=348B1014CA4F6157!113&authkey=!AD8ka_pEMz_oaPI I hope to run Cat5e directly from the dvr to the dome, use one twisted pair with a passive balun for the video, then another twisted pair for the RS485. I would like to use the remaining two twisted pairs for the power. I used the following calculator http://www.netkrom.com/voltage_loss_over_cat5_calculator.php?re2=cal&item=resources and input the details as follows Input voltage 24 Input Current 0.37a (24a/65w) Cable length 15m (50ft) Cable Pairs 2 Wire Guage 24 Results Voltage Drop 0.1 Required Supply 24.1 Effective Guage 21 Cable Resistance 0.6 Power dissipation 0 Does this look as though it will work ok? Any improvements or errors ar anything at all really will be listened to, thought about, responded to and acted upon? Cheers Guys