Differences

This shows you the differences between two versions of the page.

--- telecoms:pdh-sdh [29/06/2023 15:21] – created - external edit 127.0.0.1
+++ telecoms:pdh-sdh [01/09/2025 23:14] (current) – [SDH node] andrew
@@ Line 10: / Line 10: @@
 ===== SDH node =====
-This ADM is made by Marconi, but why they don't advertise it with any sort of logo is a mystery.
+This Add Drop Multiplexor (ADM) is made by Marconi, but why they don't advertise it with any sort of logo is a mystery.
 {{:rb:sdhnode.jpg?400|}}
+{{ :telecoms:sdhnode.jpg?400 |}}
 {{: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 40: @@
 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 |}}
+----
+This page has been accessed:- \\
+Today: {{counter|today}} \\
+Yesterday: {{counter|yesterday}} \\
+Until now: {{counter|total}} \\