Motorola SB3100 Instrukcja Instalacji Pobierz pdf (Strona 9)

The SB3100 cable modem delivers digital multimedia content in a two-way transmission

system. It provides access to a data network running over the cable system, which provides

access to the worldwide web.

The SB3100 is authorized by the Cable Modem Terminations System (CMTS) for use on the

network and automatically configures itself with the parameters received from the CMTS or

headend. When the SB3100 is powered on, it scans the frequency spectrum to locate the data

frequency and then automatically locks on to that channel. After finding the data channel, it

searches for a message containing the upstream parameters such as frequency, modulation,

symbol rate and forward error correction (FEC) format. The SB3100 then transmits a message

to the CMTS requesting additional information that enables network connection. Through a

series of messages, the SB3100 establishes Internet Protocol (IP) connectivity using Dynamic

Host Configuration Protocol (DHCP) and then receives a configuration file using the Trivial File

Transfer Protocol (TFTP). This configuration file contains additional parameters that are

required by the SB3100. When the configuration is complete, the SB3100 registers with the

CMTS and is authorized to use the network.

Figure 2-1 illustrates SB3100 data path:

10Base-T

Internet

HFC plant

Upconverter

Client PC

SB3100

external

cable

modem

Diplex

filter

CMTS

Network

management

services

Customer premises

equipment

10Base-T

The SB3100 supports 64 and 256 QAM technology that are necessary for the DOCSIS data

network. This network carries IP data in standard MPEG-2 packets. The RF downstream

receives data at speeds up to 38 Mbps and RF upstream provides data transfer at rates up to

10 Mbps.

The SB3100 provides an HTML user interface that enables you to monitor both the cable

modem and the data signals. This interface can be used to diagnose the network connections.

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Motorola SB3100 Instrukcja Instalacji Strona 9