Cabletron Systems STHI manual Operating Specifications, 2. RJ45 to DB25 Connector Pinout

Operating Specifications

Shield continuity is maintained by contacts within the female RJ45 that contact the metallic casing of the male RJ45 on the STP lobe cable.

The COM port is a female RJ45 connector supporting EIA RS232C connections via cables with pinout configurations as specified in Figure 2-2 or Figure 2-3.

RJ45 Plug			Female 25 Pin D-Shell
8	1	13			1
		25		14

		Transmit	Pin 1	to	Pin	3	Receive
		Receive	Pin 4	to	Pin	2	Transmit
	Signal Ground		Pin 5	to	Pin	7	Signal Ground
Data Carrier Detect			Pin 2	to	Pin 20		Data Terminal Ready
Data Terminal Ready			Pin 6	to	Pin	5	Clear to Send
		Figure 2-2. RJ45 to DB25 Connector Pinout
RJ45 Plug							Female DB-9
8		1					5		1
							9	6

Transmit	Pin 1	to	Pin 2	Receive
Receive	Pin 4	to	Pin 3	Transmit
Signal Ground	Pin 5	to	Pin 5	Signal Ground
Request to Send	Pin 7	to	Pin 7	Ready to Send
Clear to Send	Pin 8	to	Pin 8	Clear to Send

Figure 2-3. RJ45 to DB9 Connector Pinout

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