DIY UTP TESTER....HELP...

[eyis_ece]

hello po mg engineers...

im planning po to build a UTP tester na kaya pong idetect kung what type (ex. straight, crossover, rollover) and kung saang side ung sira or open in case na may sira...

kasi po usually po pag may sira dun sa Cable, wala nang choice kundi putulin ung both sides (ex. for RJ 45 - ethernet cable)...

ang plan ko po is magsend ng signal, tapos masususkat nung device kung gano kalayo ung inabot ng signal, so that in case na 0 ung distance na makuha ko, it means na dun sa side na unang dadaanan ng signal ung open... para pong sa OTDR nadedetect kung saan ung fiber break...

ano po kayang type ng signal ung send ko?

penge po comments and suggestions..

tnx po sa mga magrereply...

[1110000]

may nabibili nyan ah

[paranz]

@ TS

you can use a microcontroller for this. Connect the one side of the UTP cable (which has 4 solid wires) to 4 output pin of a microcontroller. Then the other end of the cable to 4 input pins.

Send output signals at the first end (that is, the 4 output pins) then receive it at the other end (4 input pins). You can then determine the type of connection cable (ST, CO, open, wrong connection, etc) via the mcu program, according to received signals in the input pins

[rdpzycho]

kung kailangan mo malaman yung position ng break, TDR ang gagawin mo. kailangan mo ng mismatch circuit.

[paranz]

hindi pala pwede gamitin yung suggestion ko sa isang cable na connected sa network, its a simple cable tester

if im not mistaken, sa mamahaling computer network analyzers ang may TDR-like function

[rdpzycho]

alam ko medyo madali naman 'to. TDR dati ang thesis ng GF ko pero scope based yung detection. hindi gumawa ng program.

[eyis_ece]

alam ko medyo madali naman 'to. TDR dati ang thesis ng GF ko pero scope based yung detection. hindi gumawa ng program.

pwede po ba makahingi kahit block diagram or flow chart kung pano ginawa ung TDR nila?

kahit ung flow lang po?

tnx..

[rdpzycho]

hindi ko kabisado, basta merong signal, merong mismatch circuit tapos nakadugtong yung cable, tapos sa isang part naman yung oscilloscope. alam ko meron 'to sa book ni Boylestad ata.

[eyis_ece]

hindi ko kabisado, basta merong signal, merong mismatch circuit tapos nakadugtong yung cable, tapos sa isang part naman yung oscilloscope. alam ko meron 'to sa book ni Boylestad ata.

ah ohkei..thanks po... check ko po sa book ni boylestead...

@all

kung may suggestions po kau... feel free to post it... thnx in advance..

[Macgyver]

hello po mg engineers...

im planning po to build a UTP tester na kaya pong idetect kung what type (ex. straight, crossover, rollover) and kung saang side ung sira or open in case na may sira...

kasi po usually po pag may sira dun sa Cable, wala nang choice kundi putulin ung both sides (ex. for RJ 45 - ethernet cable)...

ang plan ko po is magsend ng signal, tapos masususkat nung device kung gano kalayo ung inabot ng signal, so that in case na 0 ung distance na makuha ko, it means na dun sa side na unang dadaanan ng signal ung open... para pong sa OTDR nadedetect kung saan ung fiber break...

ano po kayang type ng signal ung send ko?

penge po comments and suggestions..

tnx po sa mga magrereply...

gumawa ako dati ng DIY loopback tester.  Yung parang PLDT box na kasya yung RJ45 tapos  binuksan ko and naglagay ako ng jumper sa  pin1&2, pin3&6, and pin4&5. 

Then all I need is continuity tester lang to check kung buo ang cable.  Ethernet uses 2 pairs  pin1&2 tapos pin3&6.  Yung pin4&5 usually gamit pang phone connection.

[deanc]

To get the distance of the cable break, pwede exploit yung capacitance ng twisted pair.  Since the capacitance is proportional to the cable length you can compute the physical distance or length of the cable from the tester.  Di ko lang sure kung pwede sa UTP cable but on coaxial cables pwede to, even a simple capacitance tester pwede.

example:

Cable with a capacitance rating of 10pf/ft
Kailangan mo makuha yung haba nya kaso naka spool.

Kabit mo yung capacitance tester on one end and get the reading, if you get say 1000pf. just divide it by 10 the you'll get 100 = 100 feet of cable.

Kung yung cable ay alam mo ang length, assuming 200 feet, tapos nakuha mo reading ay 100 then may putol yun malapit sa 100 foot mark from the tester.

[maldihtah13]

gumawa ako dati ng DIY loopback tester.  Yung parang PLDT box na kasya yung RJ45 tapos  binuksan ko and naglagay ako ng jumper sa  pin1&2, pin3&6, and pin4&5. 

Then all I need is continuity tester lang to check kung buo ang cable.  Ethernet uses 2 pairs  pin1&2 tapos pin3&6.  Yung pin4&5 usually gamit pang phone connection.

May ginawa rin me ganito ang process continuity tester lang pero indicated kung aling wire ang open, twisted at shorted. Available rin cya for three types of wire configuration

[RaffT]

@eyis,

 I think may nakita akong simple UTP cable tester using CD4017(?)... modify mo nalang cguro yung ckt for your own add-ons....

[eyis_ece]

@eyis,

 I think may nakita akong simple UTP cable tester using CD4017(?)... modify mo nalang cguro yung ckt for your own add-ons....

thanks poh ng marami...