Saturday, July 12, 2008

RG 45

RJ-45

The RJ-45 connector is commonly used for network cabling and for telephony applications. It's also used for serial connections in special cases. Here's a look at it:

RJ-45 Connector


Also, please note that it is very important that a single pair be used for pins 3 and 6. If one conductor from one pair is used for pin 3 and a conductor from another pair is used for pin 6, performance will degrade. See the following figure.

To learn more about Ethernet, check out Charles Spurgeon's Ethernet Reference.

RJ-45 Pinout for RocketPort

The following chart shows the pinout for RJ-45 connectors used on certain RocketPort serial interface cards (manufactured by Comtrol).

Pin Name/Description
1 Request To Send
2 Data Terminal Ready
3 Ground
4 Transmit Data
5 Receive Data
6 Data Carrier Detect
7 Data Set Ready
8 Clear To Send

Pinouts for ISDN

Here's an ISDN BRI U port pinout for a Cisco 750 series router:

Pin Function
1 Not used
2 Not used
3 Not used
4 U interface network connection (tip)
5 U interface network connection (ring)
6 Not used
7 Power (pass-through to S connector)
8 Ground (pass-through to S connector)

The following chart shows the pinout for RJ-45 connectors used on certain ISDN S/T interfaces. For more info, see ANSI T1.605.

RJ-45 wiring for Ethernet (T568B standard)

Pin Color Name/Description
1 White/Orange N/A
2 Orange N/A
3 White/Green Receive+
4 Blue Transmit +
5 White/Blue Transmit -
6 Green Receive -
7 White/Brown -48VDC (optional)
8 Brown -48VDC Return (optional)

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