Motorola SBG940 用户手册
SBG940 User Guide
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Downstream
Modulation
64 or 256 QAM
Maximum data rate
a
38 Mbps
Frequency range
88 to 860 MHz (30 kHz minimum step size)
Bandwidth
6 MHz
Maximum symbol rate 5.069 Msym/s (64 QAM)
5.361 Msym/s (256 QAM)
Operating level range
-15 to +15 dBmV
Input impedance
75 ohms (nominal)
Frequency range
88 to 860 MHz
Upstream
Modulation
QPSK or 8
b
, 16, 32
, 64
, or 128
QAM
Modulation rate
(nominal)
(nominal)
TDMA: 160, 320, 640, 1280, 2560, and 5120 KHz
S-CDMA: 1280, 2560, and 5120 KHz
S-CDMA: 1280, 2560, and 5120 KHz
Maximum data rate
c
30 Mbps
Bandwidth
TDMA: 200, 400, 800, 1600, 3200, and 6400
kHz
S-CDMA: 1600, 3200, and 6400 kHz
Symbol rates
160, 320, 640, 1280, and 2560 ksym/s
Operating level range
(one channel)
(one channel)
TDMA:
•
+8 to +54 dBmV (32 QAM, 64 QAM)
•
+8 to +55 dBmV (8 QAM, 16 QAM)
•
+8 to +58 dBmV (QPSK)
S-CDMA:
•
+8 to +53 dBmV (all modulations)
Output impedance
75 ohms nominal
Frequency range
5 to 42 MHz (edge to edge)
Output return loss
> 6 dB (5 to 42 MHz)
General
Cable interface
F-Connector, female, 75 ohm
CPE network interface USB, Ethernet 10/100Base-T (auto sensing)
CPE wireless interface IEEE 802.11g
Data protocol
TCP/IP
a. Actual speed will vary. Upload and download speeds are affected by several factors including, but not limited to
network traffic and services provided by your cable provider, computer equipment, server type, number of
connections to the server, and the availability of Internet routers.
connections to the server, and the availability of Internet routers.
b. With a CMTS supporting A-TDMA or S-CDMA only.
c. Actual speed will vary. Maximum speed of 30 Mbps is only attainable with A-TDMA or S-CDMA technology.
c. Actual speed will vary. Maximum speed of 30 Mbps is only attainable with A-TDMA or S-CDMA technology.