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UTP cable standards
16 years 5 months ago #26836
by Starfire
UTP cable standards was created by Starfire
Hi firewall cx. Been a while since I was on these forums but I am getting back into networking so I am dusting off the knowledge. (quite surprising what I have retained after 18 months out)
I've been going through utp cabling standards t-568A and t-568b shown here www.firewall.cx/cabling_straight.php and I have a little question that's confusing me.
In t-568b, pins 1&2 are used to transmit but in t-568a, these pins are used to recieve. This implies that the network devices themselves must have their ports set to listen at one of these specific standards.
Could anyone shed any light on this ?
Thanks
Star.
I've been going through utp cabling standards t-568A and t-568b shown here www.firewall.cx/cabling_straight.php and I have a little question that's confusing me.
In t-568b, pins 1&2 are used to transmit but in t-568a, these pins are used to recieve. This implies that the network devices themselves must have their ports set to listen at one of these specific standards.
Could anyone shed any light on this ?
Thanks
Star.
16 years 5 months ago #26841
by S0lo
Hello Starfire
Yes your right. furthermore, PCs and Routers have the same port types, (PINs 1,2 as TX and PINs 3,6 as RX). Switches and Hubs have the crossed types (PINs 1,2 as RX and PINs 3,6 as TX)
The rule is: TX should be always connected to RX. TX to TX will not work. RX to RX will not work. Think of the all this and you will come up with the following rules:
Connecting a PC to Router: Need cross over cable
Connecting a Switch to Hub: Need cross over cable
Connecting same devices: Need cross over cable
Anything else: Need a straight through cable
The exception is that some new PCs (and may be other devices) have the ability to auto detect the other side port and automatically flip their pins accordingly. In this case any cable will work.
Studying CCNP...
Ammar Muqaddas
Forum Moderator
www.firewall.cx
Replied by S0lo on topic Re: UTP cable standards
In t-568b, pins 1&2 are used to transmit but in t-568a, these pins are used to recieve. This implies that the network devices themselves must have their ports set to listen at one of these specific standards.
Hello Starfire
Yes your right. furthermore, PCs and Routers have the same port types, (PINs 1,2 as TX and PINs 3,6 as RX). Switches and Hubs have the crossed types (PINs 1,2 as RX and PINs 3,6 as TX)
The rule is: TX should be always connected to RX. TX to TX will not work. RX to RX will not work. Think of the all this and you will come up with the following rules:
Connecting a PC to Router: Need cross over cable
Connecting a Switch to Hub: Need cross over cable
Connecting same devices: Need cross over cable
Anything else: Need a straight through cable
The exception is that some new PCs (and may be other devices) have the ability to auto detect the other side port and automatically flip their pins accordingly. In this case any cable will work.
Studying CCNP...
Ammar Muqaddas
Forum Moderator
www.firewall.cx
16 years 5 months ago #26850
by Starfire
Replied by Starfire on topic Re: UTP cable standards
Terrific,
Thanks Solo
Thanks Solo
16 years 5 months ago #26859
by S0lo
Studying CCNP...
Ammar Muqaddas
Forum Moderator
www.firewall.cx
Replied by S0lo on topic Re: UTP cable standards
Glad to help
Studying CCNP...
Ammar Muqaddas
Forum Moderator
www.firewall.cx
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