Protect your ADSL or Dialup modem
and/or fax from Phone Line Spikes

To protect your computer, phone system, fax, ADSL or Dial-up Modems it is usually a good idea to install a phone line Surge Suppressor. Below are some pictures of the types of units available from Dick Smith, Tandy, Jaycar, Office Works and/or Bunnings. The multi-outlet power board units will also protect any other equipment plugged into the power board from mains power induced spikes while the phone line suppressors only protect equipment from phone line induced spikes.

The way these are used is that the phone cable from your wall socket is plugged into one of the phone sockets on the unit and another phone cable then is connected from the unit to your modem/phone/fax etc.

Standard phone dialling codes for land line phones
Telstra Phone Assistant
1#Do stuff using the Telstra Assistant
Immediate Diversion
* 21 xx xxxx xxxx #Immediate Diversion to xx xxxx xxxx
# 21 #Turn Immediate Diversion Off
* # 21 #Check if Immediate Diversion On/Off
Busy Diversion
* 24 xx xxxx xxxx #Divert if BUSY to xx xxxx xxxx
# 24 #Turn Busy Diversion Off
* # 24 #Check if Busy Diversion is On/Off
No Answer Diversion
* 61 xx xxxx xxxx #Divert if No answer to xx xxxx xxxx
* 61 xx xxxx xxxx * ss #Divert if No answer within ss seconds to xx xxxx xxxx
# 61 #Turn No Answer Diversion Off
* # 61 #Check if No Answer Diversion is On/Off
Call Forward Selected Callers
* 92 #Turn Call Forward Selected On
# 92 #Turn Call Forward Selected Off
* # 92 #Check if Call Forward Selected is On/Off
Call Waiting
* 43 #Turn Call Waiting On
# 43 #Turn Call Waiting Off
* # 43 #Check if Call Waiting is On/Off
* 44 xx xxxx xxxxTurn Call Waiting Off for THIS call to number xx xxxx xxxx
Recall (wait dial tone) 2Answer an incoming call while on the phone
Recall (wait dial tone) 2Switch between calls
Recall (wait dial tone) 1Hang up current call - return to the other
Recall (wait dial tone) 0Reject incoming call
Last Missed Call
* 10 # (1 to return call)Retrieve the number of the last MISSED call
Caller ID
1831 xx xxxx xxxxTurn caller ID OFF for call to xx xxxx xxxx
1832 xx xxxx xxxxTurn caller ID ON for call to xx xxxx xxxx (for silent numbers)
Using Duet Fax Number
* 11 * 3 #Prefix all calls with this to SEND using duet phone number and this will ALSO turn off call waiting for the duration of the fax call if you have it turned on for the main phone number
What is Your Phone Number
127 22 123If you dial this number you should get a computerised voice telling you the phone number that you dialled from. This is useful if you need to identify WHICH phone line is connected to one of your phone sockets.

Standard wiring and colour codes for phone sockets

Phone Plug Colour Codes
8 Pin Plug
6 Pin Plug
4 Pin Plug
1 WHI      
2 BRN1 WHI   
7 ORA6 BLU   
8 BLU      

RS232 cables can be used to link printers, modems
and terminals to computer systems

RS-232C Connections
18CD:Carrier DetectIn
23RD:Receive DataIn
32TD:Transmit DataOut
420DTR:Data Terminal ReadyOut
57GND:Signal GroundBoth
66DSR:Data Set ReadyIn
74RTS:Request to SendOut
85CTS:Clear to SendIn
922RI:Ring IndicatorIn
-1FG:Frame GroundOut
1-FG:Frame GroundOut
23TD:Transmit DataOut
32RD:Receive DataIn
47RTS:Request to SendOut
58CTS:Clear to SendIn
66DSR:Data Set ReadyIn
75GND:Signal GroundBoth
81CD:Carrier DetectIn
204DTR:Data Terminal ReadyOut
229RI:Ring IndicatorIn

To make up a "straight through" cable for RS-232 devices you would wire pin-1 to pin-1, pin-2 to pin-2 etc if the two devices both use DB25 connectors or both DB9 connectors. If one uses a DB9 and the other uses a DB25 then use the connections in either of the two boxes above eg DB9-1 to DB25-8, DB9-2 to DB25-3 etc

To make up a "cross over" cable for RS-232 devices you would swap the connections for
RD and TD,
RTS and CTS and
at ONE end of the cable - it doesn't matter WHICH end.

If you don't have enough wires in your cable you can link the DTR and DSR and/or CTS and RTS at each end of the cable and so NOT link these connections from one connector to the other HOWEVER this means that these "handshaking signals" will not be connected and you may lose data. Qantel minicomputers don't need the DTR, DSR, CTS or RTS signals connected as they are not used although there are signal voltages present in the interfaces. If you are not using the cable to connect to a serial modem then you can ignore the RI connector and the CD connector.

As a bare minimum cable you need three wires for the TD, RD and the GND signals.

RS-232 Cross Over Cable
One EndToOther End
SignalDB9DB25 DB9DB25Signal
CD18 18CD
RD23 32TD
TD32 23RD
DTR420 66DSR
DSR66 420DTR
RI922 922RI

Car Trailer 7-pin plug wiring

Just while I'm at it - here's the wiring for a 7-pin trailer plug for car trailers.

7-pin trailer plug for car trailers
1Yellow Left Indicator
2Black Auxiliary or Reversing Signal
3White Earth
4Green Right Indicator
5Blue Electric Brakes
6Red Stop Light
7Brown Tail Lights, No Plate etc

15 Pin VGA (DB15) Pin assignments
1REDRed video signal
2GREENGreen video signal
3BLUEBlue video signal
4N/CNot connected
6RED_RTNRed video signal return
7GREEN_RTNGreen video signal return
8BLUE_RTNBlue video signal return
9N/CNot connected
11N/CNot connected
12SDAI2C data
13HSYNCHorizontal synchronisation signal
14VSYNCVertical synchronisation signal
15SCLI2C clock

Computer Power Connectors

1.44Mb Floppy Drive Power Connector
FloppyPinName ColorDescription
1+5V Red+5 VDC
2GND Black+5 V Ground
3GND Black+12 V Ground (Same as +5 V Ground)
4+12V Yellow+12 VDC

IDE Hard Drive Power Connector
HardPinName ColorDescription
1+12V Yellow+12 VDC
2GND Black+12 V Ground
3GND Black+5 V Ground (Same as +12 V Ground)
4+5V Red+5 VDC

Current motherboard ATX-24 Connector
This is just an ATX-20 connector with an extra plug with 4 extra connectors
ATX-24PinName ColorDescription
13.3V Orange+3.3 VDC
23.3V Orange+3.3 VDC
3COM BlackGround
45V Red+5 VDC
5COM BlackGround
65V Red+5 VDC
7COM BlackGround
8PWR_OK GrayPower Ok is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation
95VSB Purple+5 VDC Standby Voltage (max 10mA)
1012V Yellow+12 VDC
1112V Yellow+12 VDC
123.3V Orange+3.3 VDC
133.3V Orange+3.3 VDC
14-12V Blue-12 VDC
15COM BlackGround
16/PS_ON GreenPower Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.
17COM BlackGround
18COM BlackGround
19COM BlackGround
20-5V White-5 VDC
21+5V Red+5 VDC
22+5V Red+5 VDC
23+5V Red+5 VDC
24COM BlackGround

Older motherboard ATX-20 Connector
This is just an ATX-24 connector without the extra plug with the 4 extra connectors
ATX-20PinName ColorDescription
13.3V Orange+3.3 VDC
23.3V Orange+3.3 VDC
3COM BlackGround
45V Red+5 VDC
5COM BlackGround
65V Red+5 VDC
7COM BlackGround
8PWR_OK GrayPower Ok (is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation)
95VSB Purple+5 VDC Standby Voltage (max 10mA)
1012V Yellow+12 VDC
113.3V Orange+3.3 VDC
12-12V Blue-12 VDC
13COM BlackGround
14/PS_ON GreenPower Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.
15COM BlackGround
16COM BlackGround
17COM BlackGround
18-5V White-5 VDC
195V Red+5 VDC
205V Red+5 VDC

IDE Hard Drive Connectors
3DD7BothData 7
4DD8BothData 8
5DD6BothData 6
6DD9BothData 9
7DD5BothData 5
8DD10BothData 10
9DD4BothData 4
10DD11BothData 11
11DD3BothData 3
12DD12BothData 12
13DD2BothData 2
14DD13BothData 13
15DD1BothData 1
16DD14BothData 14
17DD0BothData 0
18DD15BothData 15
20KEY-Key (Pin missing)
21DMARQ?DMA Request
23/DIOWOutWrite Strobe
25/DIOROutRead Strobe
27IORDYInI/O Ready
28SPSYNC:CSEL?Spindle Sync or Cable Select
29/DMACK?DMA Acknowledge
31INTRQInInterrupt Request
32/IOCS16?IO ChipSelect 16
33DA1OutAddress 1
34PDIAG?Passed Diagnostics
35DA0OutAddress 0
36DA2OutAddress 2
39/ACTIVEOutLed driver

Each cable normally has three connectors, one of which plugs into a IDE controller on the motherboard. The remaining connectors plug into drives. Parallel ATA cables transfer data 16 or 32 bits at a time. Originally HDD cables had 40 wires, but an 80-wire version appeared with the introduction of the Ultra DMA/66 standard. The 80-wire cable provides one ground wire to each signal wire. This reduces the effects of electromagnetic induction between neighboring wires and enables the 66 megabyte per second (MB/s) transfer rate of UDMA4. The faster UDMA5 and UDMA6 standards require 80-conductor cables. This was done to reduce crosstalk. Though the number of wires doubled, the number of connector pins remains the same as on 40-conductor cables. The physical connectors are identical between the two cable types.

If two drives attach to a single cable, the configuration generally sees one as a master and the other as a slave. The master drive generally shows up ahead of the slave drive when the computer's operating system enumerates available drives. The master drive arbitrates access to devices on the channel so each channel must have a master in order to function properly. In a drive setting called cable select the drives automatically configure themselves as master or slave. This is achieved by cutting wire 28 (on 40 wire cables, or wires 56 and 57 on 80 wire cables) between the two HDD/CDROM connectors and some newer cables have this done internally in the connectors. In this case, the two connectors are of different colours.

Note: Direction is Controller relative Devices (Harddisks).

SCART Connector