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Introduction

IP and MAC Layer

Specifications

Physical Layer

Specifications

Physical Layer

Property

Dynamic range

Symbol rate

Specifications

This section describes the specifications for the Motorola AL 200 Multi-User

Modem.

This table describes the IP and MAC layer specifications for the AL 200.

IP and MAC Layer

MAC performance

Upstream bandwidth request

Multicast

Filtering

This table describes the Physical layer specifications for the AL 200.

Physical Layer

Property

Impedance, return loss

Frequency range

Channel assignment

Channel bandwidth

This table describes the physical specifications for each modulation mode.

Transmitter

16QAM

+8 to +55 dBmV

+8 to +58 dBmV

160, 320, 640, 1280,

2560 Ksym/s

16 CPE MAC addresses and eight

downstream encryption SIDs

Four independent upstream transmit

controllers

256 multicast groups

272 IP filters

Specification

Upstream Transmitter Downstream Receiver

75 Ohms nominal, >6 dB

5 - 42 MHz

Variable center frequencies Standard, IRC, and HRC

200, 400, 800, 1600, and

3200 KHz

Specification

QPSK

64QAM

-20 to +15 dBmV

Typically -25 to

+15 dBmV

5.056941 Msym/s 5.360537 Msym/s

Appendix A

Specifications

Specification

75 Ohms nominal, >6 dB

91-857 MHz

6 MHz for 64QAM and

256QAM

Receiver

256QAM

-15 to +15 dBmV

Typically -20 to

+15 dBmV

A-1