Alastair Johnson wrote:
Interestingly, telcos that deploy SDH mux equipment to
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?
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