What do the NEAX exchanges use for backhaul?

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Forums › Spark New Zealand (including Skinny and BigPipe) › What do the NEAX exchanges use for backhaul?

SomeoneSomewhere

1802 posts

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#171114 7-Apr-2015 04:02

Idle curiosity and a discussion elsewhere prompts this one.

Do they have dedicated fibres (ATM?), or are they encapsulated in other networks? Does this vary by geography?

How are interconnects between the legacy NEAX system and other providers' VoIP/cellular networks handled? International?

How do international calls travel? Same fibres as general internet traffic, dedicated fibres in the same cable, or dedicated cables? What about before intercontinental comms cables became common?

Please dump information!

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NealR

426 posts

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#1279788 9-Apr-2015 16:19

The fundemental building block for PSTN services is a 64kbps timeslot within G.703 framing structure.
Thus NEAX platforms are connected by G.703 E1 (2Mbps) links/trunks which are muxed into PDH (Plesiochronous Digital Heirarchy) or SDH (Synchronous Digital Heirarchy) systems that then get carried mainly over fibre systems but in some cases Microwave Radio and/or Copper systems are also used.

Systems used vary based on technical capability within the region.

VoIP networks are connected to PSTN/NEAX platforms using G.703. NEAX's don't have IP.

The same fibre might carry Internet, Business Data and PSTN traffic but these are separated by wavelengths and thus never impact on each other.

Back in the dimm dark days before fibre the world was connected by a combination of under sea Coax and Copper cables. Now it's all wavelengths and a tiny tiny tiny bit of Satellite.

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