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dread high bit disease
(foldoc) | dread high bit disease
A condition endemic to PRIME (also known as
"PR1ME") minicomputers that results in all the characters
having their high bit (0x80, see meta bit) ON rather than
OFF. This complicates transporting files to other systems and
talking to true 8-bit devices. Folklore had it that PRIME
adopted the convention in order to save 25 cents per {serial
line} per machine; PRIME old-timers, on the other hand, claim
they inherited the disease from Honeywell via customer
NASA's compatibility requirements and struggled heroically to
cure it. Whoever was responsible, this probably qualifies as
one of the most cretinous design tradeoffs ever made. A few
other machines have exhibited similar brain damage.
[Jargon File]
(2002-04-09)
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high bit-rate digital subscriber line
(foldoc) | High bit-rate Digital Subscriber Line
HDSL
(HDSL) A form of {Digital
Subscriber Line}, providing T1 or E1 connections over two
or three twisted-pair copper lines, respectively. Unlike
most other forms of DSL HDSL is not a typical consumer
service, it's used mostly to replace traditional T1/E1
connections, such as connecting PBXes to telco offices.
The advantage of HDSL over the Alternate Mark Inversion line
coding scheme traditionally used on T1/E1 lines is that it
requires about an order of magnitude lower bandwidth to carry
the same traffic.
(1998-05-18)
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very high bit-rate digital subscriber line
(foldoc) | Very high bit-rate Digital Subscriber Line
VDSL
(VDSL) A form of {Digital
Subscriber Line} similar to ADSL but providing higher speeds
at reduced lengths.
(1998-05-18)
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