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--- telecoms:pdh-sdh [29/06/2023 15:21] – created - external edit 127.0.0.1
+++ telecoms:pdh-sdh [13/06/2025 22:26] (current) – andrew
@@ Line 14: / Line 14: @@
 {{:rb:sdhnode2.jpg?400|}}
-It was connected back to Telewest's network via a dual SDH ring operating at [[https://en.wikipedia.org/wiki/STM-1|stm1]] or [[https://en.wikipedia.org/wiki/Optical_Carrier_transmission_rates#OC-3|oc3]] or 155MB/s. These rings were presented over single mode fibre (blue) with F type optical fible connectors, four fibres in total, tx and rx for each ring
+It was connected back to Telewest's network via a dual SDH ring operating at [[https://en.wikipedia.org/wiki/STM-1|stm1]] or [[https://en.wikipedia.org/wiki/Optical_Carrier_transmission_rates#OC-3|oc3]] or 155MB/s. These rings were presented over single mode fibre (blue) with F type optical fibre connectors, four fibres in total, tx and rx for each ring
 We had a breakout of 2Mb/s circuits to feed our networking equipment presented on BNC coax connectors. The inner workings of this are a mystery, as it was part of Telewest's network, they managed it.
@@ Line 38: / Line 38: @@
 In the diagram, only the first 2 8Mb/s groups are used.
+==== Nokia DNT2 (Data Network Terminal 2) ====
+I guess this fits in the PDH section somehow.... but it's not a multiplexor, just an NTE with X21 or G703 interfaces on the subscriber side and a SDSL link to the Exchange.
+{{:telecoms:dnt2-network-example.png?200 |}}
+{{:telecoms:dnt2-point-to-point-example.png?200 |}}
+{{ :telecoms:dnt2mi_spmp.pdf |}}
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