Appendix B. Manual modem commands, Basic AT commands

Appendix B. Manual modem commands

The following section lists commands for manually programming your modem.

Commands are accepted by the modem while it is in Command Mode. Your modem is automatically in Command Mode until you dial a number and establish a connection. Commands may be sent to your modem from a PC running communication software or any other terminal devices.

All commands sent to the modem must begin with AT and end with ENTER. All commands may be typed in either upper or lower case, but not mixed. To make the command line more readable, spaces may be inserted between commands. If you omit a parameter from a command that requires one, it is just like specifying a parameter of 0.

Example:

ATH [ENTER]

Basic AT commands

In the following listings, all default settings are printed in bold text.

Command		Function

A		Manually answer incoming call.

A/		Repeat last command executed. Do not
		precede A/ with AT or follow with ENTER.

D_		0 - 9, A-D, # and *

	L	last number redial

	P	pulse dialing

		Note: Pulse dialling is not supported for
		Australia, New Zealand, Norway, and South
		Africa.

	T	touch-tone dialing

	W	wait for second dial tone

	,	pause

	@	wait for five seconds of silence

	!	flash

	;	return to Command Mode after dialing

DS=n		Dial one of the four telephone numbers
		(n=0-3) stored in the modem non-volatile
		memory.

E_	E0	Commands are not echoed

	E1	Commands are echoed

+++		Escape Characters - Switch from Data Mode
		to Command Mode (T.I.E.S. Command)

H_	H0	Force modem on-hook (hang up)

8318, 8317, 6826, 8319 specifications

The IBM 6826, 8318, 8319, and 8317 are part of IBM's storied history in producing innovative computing systems, particularly in the context of enterprise solutions. These models represent a significant evolution in technology, showcasing IBM's commitment to high-performance computing, reliability, and scalability.

The IBM 6826, often recognized for its role in the midrange marketplace, provided businesses with powerful processing capabilities at a relatively affordable price. It was engineered to handle various workloads, from basic transaction processing to more complex applications. One of its key features was its ability to support multiple users simultaneously, making it suitable for medium-sized businesses that required robust computing power without the cost of larger mainframe systems.

Transitioning to the 8318, this model became notable for its advanced server capabilities, integrating improved processing power and memory options. The 8318 was instrumental in supporting critical business applications and offered enhanced reliability. Additionally, it featured new management interfaces that allowed for easier monitoring and maintenance of software and hardware components, which was especially valuable for enterprise environments.

The IBM 8319, a further enhancement, improved scalability and introduced cutting-edge technologies aimed at maximizing performance. This model allowed businesses to scale resources according to demand, making it particularly beneficial during peak operational periods. The 8319 was designed with built-in redundancy features, thereby minimizing downtime and ensuring continuous operations—a vital aspect in today's fast-paced business ecosystem.

Finally, the IBM 8317 served as a versatile solution that catered to various computing needs. It combined the strengths of its predecessors, delivering superior processing speed and excellent storage options. The 8317 was also equipped with advanced networking capabilities, supporting seamless integration within increasingly complex IT infrastructures.

Collectively, these IBM models underscore the company's dedication to technological progression tailored for enterprise requirements. They utilized multiple processing architectures, advanced memory management systems, and user-friendly administration tools, all contributing to their reputation as reliable and efficient computing solutions. As such, they played a critical role in not just shaping IBM’s product lineage but also in influencing the wider landscape of enterprise computing technology.