why sms is only 160 characters long?

Archived from groups: alt.cellular.gsm (More info?)

why sms is only 160 characters long?
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  1. Archived from groups: alt.cellular.gsm (More info?)

    On 26 Oct 2004 02:46:05 -0700, prince_nsa@yahoo.com wrote:
    >why sms is only 160 characters long?

    It is GSM-standard.

    If it were 468, you would have asked the same.


    --
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  2. Archived from groups: alt.cellular.gsm (More info?)

    <prince_nsa@yahoo.com> wrote in message
    news:1098783965.560915.96690@z14g2000cwz.googlegroups.com...
    > why sms is only 160 characters long?

    Because that's the most they could get into a single GSM signaling "frame"
    (I think that's the right term).

    --
    Donald Newcomb
    DRNewcomb (at) attglobal (dot) net
  3. Archived from groups: alt.cellular.gsm (More info?)

    "prince_nsa@yahoo.com" wrote:

    > why sms is only 160 characters long?

    Because an SMS can use either a 7-bit, 8-bit or 16-bit alphabet,
    the number of bytes needs to be even and a factor of 7 (to
    avoid wasted space).

    To achieve the elegance of having a number that's a multiple of
    10, the choices get further limited to 70, 140, 210, 280, etc
    bytes. I can only assume the choice of 140 bytes (160 7-bit
    characters) was made over 210 bytes (240 7-bit characters)
    because it seemed to be the best compromise between usefulness
    and available resources.

    John
  4. Archived from groups: alt.cellular.gsm (More info?)

    On 26 Oct 2004, at 02:46:05 [GMT -0700] (19:46:05 Tuesday, 26 October 2004
    where I live) "prince_nsa@yahoo.com" wrote:

    > why sms is only 160 characters long?

    Yes, but you can send 3 x 160 in one message (network dependant)

    --
    What goes around usually gets dizzy and falls over.
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