Computer Networking
The signal to noise ratio for a voice grade line is 30.1 dB (decibels) or a power ratio of 1023:1. The maximum achievable data rate on this line whose spectrum ranges from 300 Hz to 4300 Hz is

6200 bps
9600 bps
None of these
34000 bps
31000 bps

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Computer Networking
RS-449/442-A/423-A is

the ratio of the number of data units in error to the total number of data units
a set of physical layer standards developed by EIA and intended to replace RS-232-
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and
a check bit appended to an array of binary digits to make the sum of the all the binary digits
None of these

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