HP Rp2430 HP DTC Cabling and Racking Guide - Page 75

Making your own cables

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8 Making your own cables This chapter includes advice which you may find useful when making your own cables to connect devices to ports on the Modem Distribution Panel, the Direct Distribution Panel, and the 24-port RJ45 Direct Distribution Panel. You will also find some background information concerning the RS-232, RS-422, and RS-423 standards. A note on standards As demand grows for terminal-to-system connections supporting higher baud rates over greater distances, the use of RS-422 and RS-423 is becoming more prevalent. This section gives an overview of these standards. The RS-422 and RS-423 standards are electrical standards. They specify the electrical characteristics of the digitial interface circuit. The RS-232 standard specifies the electrical, physical, and logical characteristics of the interface circuit. Consequently, a comparison of RS-232 with RS-422 and RS-423 can only be a comparison of electrical standards. 69

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8
Making your own cables
This chapter includes advice which you may find useful when making your own
cables to connect devices to ports on the Modem Distribution Panel, the Direct
Distribution Panel, and the 24-port RJ45 Direct Distribution Panel.
You will also find some background information concerning the RS-232, RS-422,
and RS-423 standards.
A note on standards
As demand grows for terminal-to-system connections supporting higher baud rates
over greater distances, the use of RS-422 and RS-423 is becoming more prevalent.
This section gives an overview of these standards.
The RS-422 and RS-423 standards are electrical standards. They specify the
electrical characteristics of the digitial interface circuit.
The RS-232 standard specifies the electrical, physical, and logical characteristics of
the interface circuit.
Consequently, a comparison of RS-232 with RS-422 and RS-423 can only be a
comparison of electrical standards.