On-Line #15 17 декабря 1995

Железо

Iron - Because of what happen interference in modem communication.

                 IRON



   Since I am directly connected with the telephone, I decided 
to tell you a little about it. Let's start with what you almost 
all concerned with the question: which is why there are such 
strong (And not) interference?



   Let's start with the fact that the system in our 
relationship, say softly, bad. Many exchanges are still working 
with the equipment we had set since it was built. The reason 
for this - simplicity and reliability. 


   Step-by-steppers, coordinate, quasi-electronic and electronic
ATS dispersion throughout Moscow. The most ubiquitous - it is 
step-by-Step Exchange. But I'll write about this a little 
later. 


   So, let's begin.


   Interference, mainly produce some damage in the same cable, 
which we, basically, and communicate. 


   1. Talking to some subscribers, you sometimes do not notice 
any interference or noise, but in actual fact, on the pair may 
be damaged, of which you had no idea. It's called 
COMMUNICATION. 

               MESSAGE:


                                                       \
                            > 1

                                                       /

      /

   2 <

      \

               1-People who talk among themselves.
               2-Man, eavesdropping them.


   In fact, the message is dense and not very dense.


   Dense - it is thorough regarding the two veins, and that this
stop, it is necessary to give a complaint to the site.


   Incomplete - this means that couples can relate only 
occasionally, and then briefly. 


   What about the modem: it is not scary. Let the dude 
pokayfuet. 



   2. It so happens that during the conversation there are 
strong interference and noise, as much talk is impossible. You 
can definitely carp that it short.

               Brief:



   That's the same thing here. Short is dense and not very 
dense. 


   Dense - that is all Khan. And do not think much nibut call.


   Better just go to the site, do not think that open-loop cores
themselves.


   Incomplete - this means that sometimes skips some
loud noises. Sometimes, for example, the cable is in the ground 
under the asphalt, drove a truck and set up vibration. 


   What about the modem: it is impossible skonnektitsya.



   3. When you talk with the caller, talking is always
is what the realties rustling or crackling. Sometimes these 
obstacles disappear. Somnevatsya not need that land. 

               Plot:



   Here is the same.


   Dense - there are a noise disturbance, but sometimes very 
loud. 


   Loose - it's quiet, noise, and sometimes disappear.


   What about the modem: konnektnost possible, but there may be 
exceptions. 



   4. Sometimes, talking to each other, you suddenly, 
unexpectedly during the conversation you hear the caller hung 
up. At first look you think that a subscriber accidentally 
pressed the lever switch. The second time you will think that 
he makes fun. A on the third? Possible to obtain a quarrel 
between you, but a quarrel As you should not work. Because - 
this is without a doubt Breakage.

            OPEN:



   This implies that the old cable.


   You understand that when a dense cliff ... Far away.


   A non-rowed ... and what a difference.


   What about the modem: I think, guessed it.


                     MDM 732-7692; 18:00 / 22:00
                    Andrey@7327692.msk.ru