What does redundant means in this sentance?

[Jesse Dorland]

The main difference between SIMMs and DIMMs is that DIMMs have
separate electrical contacts on each side of the module, while the
contacts on SIMMs on both sides are redundant.

I just the meaning of redundant, and according to dictionary.com

1. characterized by verbosity or unnecessary repetition in expressing
ideas; prolix: a redundant style.
2. being in excess; exceeding what is usual or natural: a redundant
part.

I assuming that it means contact of both side of sim are transfering
same info -- kinda like a backup?

[Pat Durkin]

"Jesse Dorland" <jessed...@gmail.com> wrote in message
news:6905d3e6-b7c9-49ff...@u26g2000yqu.googlegroups.com...

I think so. Military systems and some other complicated work-ups
(space shuttles, space stations) have built-in multiple redundancies
so that if one fails, another can be used to avoid loss of life or of
valuable equipment. One thinks of the auto-pilot on airplanes. Or
instrument flying. There is always a manual system in case of failure
or emergencies requiring human judgment. Otherwise, computerized
systems far exceed human agency in speed and accuracy.

I don't know about SIMMS and DIMMS. But it seems the one with the
redundancy might be able to be flipped and re-used, if it fails as
first installed.

[Glenn Knickerbocker]

On Sat, 3 Jul 2010 12:50:39 -0700 (PDT), Jesse Dorland wrote:
>I assuming that it means contact of both side of sim are transfering
>same info -- kinda like a backup?

They're both part of the same contact. Both sides connect to the same
pin of the module.

ŹR Blather, Rinse, Repeat.
http://users.bestweb.net/~notr/telecom.html

[mm]

On Sat, 3 Jul 2010 12:50:39 -0700 (PDT), Jesse Dorland

<jessed...@gmail.com> wrote:

No. Only one tranfer. SIMMs preceded DIMMs and they are certainly
not more sophisticated. But there are two sides to the slot and they
decided to put a pin on both sides of the memory.

It just means for every contact on one side, there is a contact
directly behind it on the other side that is connected electircally to
it. It doesn't mean more is happening, any more than a prong on an
electric plug (of a low amperage appliance) that is a half inch wide
is doing any more than it would do if it were half that width.

One of each pair of contacts is redundant because everything would be
the same if it didn't exist.

If there were a backup transfer, it would be called redundant
transfer, not redundant contacts.
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