SB5101 Cable Modem Overview
MOTOROLA BCS
CONFIDENTIAL
Page 7 of 34
The key physical component portion of the SB5101 system is the BCM3349 chip (Broadcom). The
BCM3349 is a single-chip that supports the two advanced communication technologies required by
the DOCSIS 2.0 specification – advanced time division multiple access (A-TDMA) and
synchronous code division multiple access (S-CDMA). Other parts of the Cable Modem include a
BCM3419 Silicon Tuner, SDRAM, non-volatile storage (Flash), Ethernet interface, and USB
interface. The SB5101 provides 16 Service ID’s (SIDs) rather than the 4 available with the
SB5100, this provides much greater flexibility for the provision of multiple services with individual
QoS, determined by the needs of the service, data, voice, video etc.
4.1 Technical Specifications:
SB5101
GENERAL
Interface to PC
Ethernet
10/100-BaseT,
RJ-45
connector, USB
Data Protocol
TCP/IP
Dimensions 15.75cmHx5.52cmW
x
15.24cmL
Cable Interface
Female F-Connector, 75
Ώ
DOWNSTREAM
Modulation
64 or 256 QAM
Maximum Data Rate
27 Mbps (in 64QAM mode) or
38 Mbps (in 256QAM mode) (limited
by transmission protocol)
Bandwidth 6
MHz
Maximum Symbol Rates
5.069 Msym/s (64QAM)
5.361 Msym/s (256QAM)
Operating Level Range
-15 to +15 dBmV
Input Impedance
75 ohms (nomimal)
Total Input Power
< 30 dBmV
Frequency Range
88-860 MHz
(
±
30 kHz min step size)
UPSTREAM
Upstream Modulation
16QAM or QPSK, (8, 32, 64 and 128
QAM with A-TDMA or S-CDMA
enabled CMTS)
Maximum Upstream Transmission
Rate
10 Mbps (30Mbps with A-TDMA or S-
CDMA enabled CMTS)
Bandwidth
200, 400, 800, 1.6 MHz, 3.2 MHz;
4 SB5101
Architecture.
