Cabling Cases and Solutions

The AD279A solution can support up to four 16-port RS-232 port modules. The port modules provide either DB25 Male RS-232 serial ports or RJ45 RS-232 serial ports.

Pin-Layout and Port Interface Differences between A6748A/A6749A and AD278A/AD279A PCI MUX Serial Ports

Table 5 describes the pin-layout differences between A6748A/A6749A and AD278A/AD279A PCI MUX serial ports.

Table 5: A6748A/9A and AD278A/9A RJ45 RS232 Pin-Layout Comparison

	AD278A / AD279A Serial MUX		A6748A/A6749A Serial MUX
	Solution		Solution
Interface type	RJ 45 RS 232 ports		RJ 45 RS 232 ports
Pin # 1	RI	Ring Indicator	RI	Ring Indicator
Pin # 2	DSR	Data Set	RTS	Request to
		Ready		Send
Pin # 3	RTS	Request to	DTR	Data Terminal
		Send		Ready
Pin # 4	GND	Chassis	RXD	Received Data
		Ground
Pin # 5	TXD	Transmitted	GND	Ground
		Data
Pin # 6	RXD	Received Data	TXD	Transmitted
				Data
Pin # 7	SG	Signal Ground	GND	Signal Ground
Pin # 8	CTS	Clear to Send	DCD	Data Carrier
				Detect
Pin # 9	DTR	Data Terminal	CTS	Clear to Send
		Ready
Pin # 10	DCD	Data Carrier	DSR	Data Set
		Detect		Ready

The AD278A/AD279A PCI MUX solution provides Male DB25 RS-232 serial ports, whereas the A6748A/A6749A PCI MUX solution provides Female DB25 RS-232 serial ports. The DB25 pin-outs for the AD278A/AD279A PCI MUX solution and A6748A/A6749A PCI MUX solution are the same.

This section discusses instances of incompatibility between A6748A/A6749A and AD278A/AD279A PCI MUX solutions. It also discusses solutions to resolve these incompatibilities. Table 6 lists scenarios of incompatibility that prevent successful migration from A6748A 8-port RJ45 solution to the AD278A/AD279A PCI MUX solution. It also describes methods to resolve issues of incompatibility.