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217 posts

Master Geek


# 41650 21-Sep-2009 14:28
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I live up in Paraparaumu, and since Friday the phones haven't been working in our area. We've been told that it will be at least Wednesday before it's fixed. The line has been transferred to a mobile, but unless we're in the garage, it's a bit of a lost cause.

The one thing I find odd is that although the phone is out, we don't have any problems accessing the internet. Just wondering from a IT perspective how this can be the case. The neighbours are also experiencing the same symptoms.

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222 posts

Master Geek


  # 257352 21-Sep-2009 14:53
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Voice services are provided by a PSTN switch and DSL is provided from a DSLAM. These are two totally separate pieces of equipment, they just happen to share the same copper wire to your house. This is why one can go down and not affect the other.

209 posts

Master Geek


  # 257354 21-Sep-2009 15:06
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I also had the same thing and found out that ADSL only requires one of the 4 wires to work while phone needed 2(?) or more of the wires. We'd had a something attack the wire connection outside our house and only the ADSL wire was still intact.

The engineer was pretty surprised but there you go.

 
 
 
 


1035 posts

Uber Geek


  # 257364 21-Sep-2009 16:01
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Klathman: I also had the same thing and found out that ADSL only requires one of the 4 wires to work while phone needed 2(?) or more of the wires. We'd had a something attack the wire connection outside our house and only the ADSL wire was still intact.

The engineer was pretty surprised but there you go.


There are in fact only two lines in total connecting your property to the telephone exchange.



217 posts

Master Geek


  # 257370 21-Sep-2009 16:29
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portunus: Voice services are provided by a PSTN switch and DSL is provided from a DSLAM. These are two totally separate pieces of equipment, they just happen to share the same copper wire to your house. This is why one can go down and not affect the other.


Thanks for that. You learn something new every day. Maybe they should just update the exchange (wishful thinking!).

307 posts

Ultimate Geek


  # 257406 21-Sep-2009 18:53
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this also happens when you are on a cabinet that is fed via DTLM/PCM for voice and a asam/isam for dsl, if the voice side goes down then dsl will still work, in this case the whole system(can be multiple systems per cabinet)  will ushally die, in which case 30 customers would loose voice service (assuming that all channels were in use).




Disclaimer: Comments I make are NOT on behalf of my employer, these comments are mine and mine alone.

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