ADC Megabit Modem 700F Manual do Utilizador descarregar pdf (Página 7)

7

Today’s GPON deployments offer

considerable distance and bandwidth

advantages over previous PON standards.

Some GPON manufacturers provide 2.5

Gbps downstream and 1.2 Gbps upstream and

serve up to 60 km. GPON also offers a few

advantages over active Ethernet solutions.

GPON deployment costs are generally lower.

Also, operating costs savings are gained

since power is not required for components

between the optical line termination (OLT)

and the optical network terminal (ONT) (see

Figure 1). Yeah, save some coal for another

day.

Similar to other PON standards, GPON CPE

units still share the OLT bandwidth, which

is not the case in active Ethernet solutions.

In the PON shared network, each subscriber

must have the same ONT and each subscriber

receives the same bandwidth. This inherent

PON design creates deployment issues

when one subscriber requests additional

bandwidth or when new technology or

firmware is introduced into the network.

The technology or firmware upgrade will

have to be completed for all the CPE units

and the OLT at the same time.

DSL and PON are excellent transitional

solutions to deliver voice, video and data

prior to deploying an active Ethernet FTTx

network. See, we can all just get along. An

active network provides dedicated circuits

to each subscriber from powered Ethernet

routing switches located in the outside plant

(see Figure 2). Active Ethernet provides

higher bandwidths (up to 10 Gbps currently)

and a larger serving area up to 120 km (versus

60 km with GPON). Since every home has

a dedicated circuit, bandwidths can continue

to climb with every advance in Ethernet

switch capability. Active Ethernet is gaining

momentum in FTTx deployments.

I wonder what technology and standards

lie ahead to satisfy our increasing appetite

for bandwidth and immediate demand for

services… stay tuned…

Ethernet Routing

Switch

OSP Enclosure

Drop Cables

Feeder Cable

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Gatewa

y

Gatewa

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Ethernet Routing

Switch

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ure 2: Active Network

Figure 2 - Active Network

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