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AAPPPPEENNDDIIXX
USER/S GUIDE
B-1
Appendix B. Cable Specifications
Twisted Pair Cable Specifications
Either shielded or unshielded twisted pair can be used. Category 5wire or better is recommended.
• Gauge. . . . . . . . . . . . . . . . . . 26 to 22 AWG
• Attenuation . . . . . . . . . . . . . Less than 11.5 dB @ 5-10 MHz
• Differential Characteristic . . 85 -110 Ω Impedance
@ 10 MHz
RJ-45 Pin Specifications
Null Modem Cable Specifications
The table below shows the pin assignments for the DB9 cable.
Function
Mnemonic
Carrier Detect CD
Receive Data RXD
Transmit Data TXD
Data Terminal Ready DTR
Signal Ground GND
Data Set Ready DSR
Request To Send RTS
Clear To Send CTS
Ring Indicator RI
Straight Through Cable at RJ-45 Plug
RJ-45 Male RJ-45 Male
3 . . . . . . . . . . . . . . . . . . . . . . 3
4 . . . . . . . . . . . . . . . . . . . . . . 4
5 . . . . . . . . . . . . . . . . . . . . . . 5
6 . . . . . . . . . . . . . . . . . . . . . . 6
The two active pairs in the token ring RJ-45
connector are pins 4 & 5 and pins 3 & 6. Use
only dedicated wire pairs (such as blue/white &
white/blue, orange/white & white/orange) for the
active pins.