Alastair Johnson wrote: [...]
Interestingly, telcos that deploy SDH mux equipment to customer sites tend to install them with a full 48V DC plant, including rectifiers and often inverters. Perhaps the MetroE guys need to take a look at how the telcos have done it in the past, if they are wanting to meet that 'five nines' of telco-land?
aj _______________________________________________
Alastair, you know that telco "five nines" tends to apply to a subset of the network, not necessarily to a single customer connection. Are you sure there's a good reason to deploy 48V DC to customer premises beyond that being needed for the SDH kit? A chain of devices with customer premises mains supply at one end adds single points of failure for the connection. Is the improvement in power quality worth it? - Donald Neal -- Donald Neal | "You can have security, or functionality, Research Officer | or scale - you can even have any two of WAND | these. But you can't have all three" The University of Waikato | - Prof. Ross Anderson