ADC Megabit Modem 700F Bedienungsanleitung PDF herunterladen (Seite 11)

Creating a Cost-

Effective Plug-

and-Play FTTP

Architecture

By Randy Reagan, FTTX Program Manager,

ADC

Today’s FTTP network planners must build

flexible and reliable architectures at the

lowest possible cost. New hardened con-

nector technologies, coupled with Multiport

Service Terminals (MSTs), accelerate plug-

and-play deployment with reduced long-

term operational expenditures.

Plug-and-play architectures are more tech-

nician-friendly by reducing the need for

highly-skilled technicians to perform instal-

lation tasks. Reducing the number of splices,

technicians and crews required to turn-up

services reduces installation, maintenance

and operational costs and makes deployment

faster and easier.

Hardened Connectors are Key

Hardened connectors are designed and tested

for Outside Plant (OSP) applications.

They withstand harsh OSP environments

and provide the same reliability and per-

formance of spliced networks--with added

benefits of lower installation costs, greater

flexibility and easier access.

They are watertight and can be installed

on the external surface of an enclosure,

providing easy access in above- or below-

ground installations. Each connector under-

goes tests designed to ensure high-perfor-

mance and reliability in OSP applications

and must meet Telcordia GR-326, GR-771

and GR3120 standards. The tests expose

the connector to thermal-aging, thermal-

cycling, humidity-aging, humidity conden-

sation cycling and post thermal cycling.

The connector also undergoes vibration test-

ing and mechanical stress tests including

flex, torsion, proof and transmission with

applied-load. Additional tests include impact

and crush resistance to simulate incidental

forces and water submersion and freeze-

thaw testing. Additional optical monitoring

tests verify that the connectors can maintain

the required insertion loss and reflection

performance during and after exposure to

harsh environments.

Finally, products are tested for extended

time periods while subjected to specific

harsh conditions. The result is a hardened

connector that withstands exposure to any

OSP environment.

The Plug-and-Play Solution

Hardened adapters are mounted on enclo-

sures at the street outside the residence and

at the optical network terminal (ONT) on

the side of the residence. A hardened drop

cable is used to connect the enclosure and

the ONT.

The drop cable is a factory-connectorized

assembly with hardened connectors on each

end. Each connector and adapter is protected

by a protective cap until put into service.

When connected, the caps are removed

to enable the inner connector components

to be aligned to complete the connection.

Factory-connectorized drop cables enable

non-technical field installation of the cables,

eliminating the need for splicing or highly-

skilled technicians.

Finally, an arrow on the connector aligns

with a notch on the adapter, ensuring precise

alignment of the connector into the optical

port, providing a vital method for ensuring

high-reliability and speed when mating a

connector to an adapter.

The Multiport Service Terminal

The other vital element is the MST that

typically resides between the FDH and the

subscriber. The enclosure is terminated and

sealed in the factory with cable stubs and

hardened adapters on the exterior surface.

It is designed for outside environments and

installed in hand-holes, pedestals, on poles,

on overhead cable or secured to any flat

surface.

MSTs are connected to the network by

splicing the stub cable to a main distribution

cable. This splice is achieved without hav-

ing to access the enclosure. The versatile

mounting schemes adapt to most installation

techniques and are designed to withstand

extreme temperatures and humidity.

MSTs are available in two-, four-, six-,

eight-, or 12-port configurations and accept

drop cables terminated with hardened con-

nectors. The factory-installed terminations

of the drop cables and MSTs eliminate

splicing and can be installed by less-skilled

technicians, again saving installation costs

and enabling rapid service turn-up.

The plug-and-play approach to an FTTx

infrastructure--possible by factory-connec-

torized MSTs and drop cables terminated

with hardened connectors and adapters--

results in significant cost savings compared

with traditional spliced architectures.

Powering the

Broadband

Networks

By Newmar

Newmar’s hot swap rectifier systems,

the Unity and Centurion, are

increasingly selected to supply 48 volt

DC power to broadband networks.

The wireless networks utilize point-

to-point microwaves to transmit

signals for internet, emergency radios,

security cameras and other critical data

transmitting devices. The rectifier

systems, integrated with their Battery

Module series creates a comprehensive

DC power system providing 48 volts

along with an integrated battery back-

up function for ride through when AC

power is down.

The Unity Rectifier System, model UR-

48-3, has a rackmount shelf that accepts

up to 3 slide-in rectifiers allowing for

N, N+1, and N+2 configurations for

increased system reliability, ideal for

critical communication systems. The hot

swap Unity Rectifier System produces 3

amps per rectifier at 48 VDC. The shelf

chassis occupies only 1 RU (1.75”) of

rack space.

The Centurion Rectifier System,

model CR-48-10, produces 10 amps

per rectifier that slides into a shelf

that accepts up to three rectifiers,

also allowing for N, N+1, and N+2

configurations. The shelf is 2 RU (3.5”)

of vertical rack space.

The Battery Module shelf eliminates the

need to source batteries, trays, cables,

terminals, lugs, and circuit breaker since

they are all included. The shelf accepts

up to two 48 volt 5-amp hour modules,

thus; fully populated provides 3 amps

of back-up power for approximately 2

hours.

Newmar offers a broad range of

DC power products with an earned

reputation of high reliability and quality

in powering wireless networks in

Broadband, Microwave, Cellular, and

Land Mobile applications.

Unity Rectifier System with Battery

Module Series Power Broadband

Networks

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