Black Box DESKTOP TELCO Spezifikationen PDF herunterladen (Seite 5)

Other important design considerations.

Usage. When planning a network, consider peak loads of all

applications, usage patterns, type of traffic, and outlet density.

Future technology. In this business, change happens fast.

See Bandwidth on the previous page.

Location of users. Where are users and how far are they from

the network switches? Will a collapsed backbone work better?

Centralized cabling? Zone cabling?

Power over Ethernet. Consider where you may need to run

power over your data lines.

Wireless access points. Plan on complete coverage.

VoIP. Voice over Internet Protocol is fast becoming the network

type of choice.

Security. Plan on current and emerging data, network, and

physical security systems, including PoE and wireless applications.

Regulations. NEC. ANSI/TIA/EIA. State and local building codes.

They exist for a reason so be sure to abide by them.

Space. Consider available space for data centers, equipment,

telecommunications rooms, and cable runs. Factor in plenum runs,

additional air ducts, sprinkler systems, suspended ceilings, etc.

Physical conditions. Consider any unusual physical constraints, such

as power lines, EMI influences, seismic activity, industrial activity, even

being below water level. For a listing of the Ingress Protection (IP)

ratings, see page 31.

Media. The type of cable you choose may depend on the

applications, architecture, environment, and more.

Redundancy. Consider whether you need duplicate pathways

to run redundant backbones for mission-critical applications.

Site survey. A comprehensive site survey should be done to

identify users’ equipment, locations, and regulations that require

attention.

Maintenance. Who is going to do it, how often, and at what

cost. Consider whether you’re going to use in-house technicians

or a contracted service.

Warranties. What do they cover? Most should cover the

cabling components and the application the system was

designed to support.

Documentation. Don’t forget proper documentation, diagrams,

labeling, color coding, and other administrative duties. Doing it right

the first time will make your life a whole lot easier in the future.

Last, but not least.

Total cost of ownership. This can be tricky. The lowest initial

installation cost is not always the least expensive. You also have

to factor in the cost of upgrades and recurring costs over the

lifetime of the system. The greatest expenses after your original

investment will be MACs and equipment upgrades. Plan on

replacing your electronic equipment three to four times over the

life of the cabling system. When all totaled, these ongoing costs

can actually equal or exceed the cost of your original investment.

You also have to consider the quality of the installation. The

lowest bid may not necessarily be the best. A well-planned and

documented installation will more than pay for itself by lowering

long-term maintenance, eliminating problems from poor

workmanship, reducing downtime, and most importantly,

giving you peace of mind.

724-746-5500 • blackbox.com

Introduction

system

Class F/CAT7 (draft):

600 MHz

CAT6a: 500 MHz

CAT6: 250 MHz

CAT5e: 100 MHz

Single-mode fiber

(campus backbone)

50-µm multimode fiber

(recommended backbone)

62.5-µm multimode fiber

(traditional backbone)

Structured Cabling System with Mixed Media

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