Read Microsoft PowerPoint - 3.0 PCM .ppt text version

Vietnam Oct

PCM Cables

2006

1

What is PCM cable? Why PCM Cables? Application?

A LAPP GROUP COMPANY

What is PCM ?

Vietnam Oct

2006

2

PCM is used with T-1 carrier system. This carrier system combine the PCM signals from many lines and transmit them over a single cable or other medium. PCM means Pulse Code Modulation The process of converting an Analog signal to a Digital signal or vice versa T1 is also known as DS1 (1.544Mbps extended to 2Mbps)

A LAPP GROUP COMPANY

What is PCM ?

Vietnam Oct

2006

3

A dedicated phone connection supporting data rates of 1.544Mbps, min

A T-1 line actually consists of 24 individual channels, each of which supports 64Kbits/ second.

A LAPP GROUP COMPANY

Why PCM ?

Vietnam Oct

2006

4

Technology advancement for fast transmission phone connection supporting data rates of 2Mbits/sec. Use for Internet and ISP (Internet Service Provider)

connection to the Internet backbone (T3)

A LAPP GROUP COMPANY

Cable Requirement

Vietnam Oct

2006

5

The important characteristics of cable for PCM transmission are divided into 2 categories, Electrical and Physical

Electrical Properties 1. Impedance ,Typically 100 +/- 15% 2. Attenuation

Inversely proportional to the individual conductor gauge. ( smaller gauge, large the attenuation)

A LAPP GROUP COMPANY

Cable Requirement

Vietnam Oct

2006

6

The important characteristics of cable for PCM transmission are divided into 2 categories, Electrical and Physical

Electrical Properties 3. Cross Talk -- prominent in analog voice transmission since it is a phenomenon which can be heard during a telephone conversation.

A LAPP GROUP COMPANY

Cable Requirement

Vietnam Oct

2006

7

The important characteristics of cable for PCM transmission are divided into 2 categories, Electrical and Physical

Electrical Properties 4. Near End Cross Talk (NEXT) -- occurs at, and close to, the digital line interface, where the TX signal power is the greatest, and the receive RX signal power is the weakest.

A LAPP GROUP COMPANY

Cable Requirement

Vietnam Oct

2006

8

The important characteristics of cable for PCM transmission are divided into 2 categories, Electrical and Physical

PHYSICAL Properties 1. Shielding

Prefer screening method overall AL. foil and braiding. Foil is better choice for screening of high frequency

A LAPP GROUP COMPANY

Cable Requirement

Vietnam Oct

2006

9

The important characteristics of cable for PCM transmission are divided into 2 categories, Electrical and Physical

PHYSICAL Properties 2. Conductors Prefer pair twisted. Solid conductor prefer Typ. Conductor size 22-28AWG

A LAPP GROUP COMPANY

PCM Cables: Basic Cable Construction

Vietnam Oct

2006

10

* Solid Annealed bare or tinned copper *Insulated with high density polyethylene *Two cores twisted to form a pair. * Overall Screening with Polyester-Al tape * Outer sheath PVC * Typical Impedance: 100 +/- 15

A LAPP GROUP COMPANY

Vietnam Oct

Application

2006

11

· · · · ·

For data net working for high speed For telephone Exchange, Data Circuits Junction Circuits between Telephone Exchanges. T-1 lines are a popular leased line option for businesses connecting to the Internet and for Internet Service Providers (ISPs) connecting to the Internet backbone.

A LAPP GROUP COMPANY

Vietnam Oct

LAPP KABEL PCM Cable

2006

12

PCM cables for high speed data transmission up to 2Mbits/sec

A LAPP GROUP COMPANY

Vietnam Oct

LAPP KABEL PCM Cable

2006

13

PCM cables for high speed data transmission up to 2Mbits/sec

3801640 8x2x0.5mm² 3801641 16x2x0.5mm² 3801642 32x2x0.5mm²

A LAPP GROUP COMPANY

Question?.

Vietnam Oct

2006

14

Any Qs?

Bye!

A LAPP GROUP COMPANY

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Microsoft PowerPoint - 3.0 PCM .ppt