APC IP DSLAM User's Guide download pdf (Page 59)

EDA 1200 Nodes

4.5.1 EPN210

The EPN210 is a -48 V DC rod mounted power

distribution unit, capable of distributing power to

10 devices. EPN 210 supports power distribution

for EDN612, ESN212 and EDN312x (power fed

through Power over Ethernet). EPN210 can deliver

up to 2A on a single port, though maximum 500 W

in total. ESN212 supports power redundancy.

EPN210 is compact and environmental hardened,

and therefore very suitable for installation and use in

both Central Office and a remote roadside cabinet.

EPN210 is used to distribute power to EDN612 and

ESN212. It can also be used to power an EDN312x,

through one of the uplink ports. However, when this

is done the port cannot be used for traffic.

4.5.2 EPN102

The compact 2-port Ethernet Power Node EPN102

implements an elegant way of providing power at

small sites. The main functionality is to supply

–48 V DC onto two of the spare wires in the

standard Ethernet cable. EPN102 provides one

Ethernet input port and one Ethernet output port

for connection to an Ethernet aggregation switch

and an IP DSLAM (EDN312x), respectively. Both

ports provide Power over Ethernet (PoE) output.

This allows for power feeding of both an IP DSLAM

and Ericsson’s Fast Ethernet to E1/T1 converter

(EXN104) in case an N*E1 uplink is preferred.

The Ethernet Power Node (EPN) operates from the

supply voltage in an input range from –40.5 to –60 V

DC and will provide output voltage accordingly, with

a voltage drop of less than 2 Volts.

EPN102 is capable of delivering up to 21 Watts per

port. A remote sensing circuit connects power when

required on each individual output – similarly power

will automatically be disconnected when load is

removed from the output.

4.5.3 Remote Powering

Remote powering is a concept for distributing DC power over existing twisted

pairs up to 10 km. The concept is typically for use in broadband applications,

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APC IP DSLAM User's Guide Page 59