Introduction
CM-D20B1 USB/Ethernet cable modem is compatible with MCNS DOCSISI 1.2/1.1/2.0 and EuroDOCSIS1.0/1.1/2.0 protocol
CM-D20B1 USB//Ethernet cable modem is used in user terminal with built-in 10/100Base-t Ethernet port and USB1.1 port to offer CATV high speed internet access service.
Specifications
Downstream (Receiver)
DOCSIS spec.
Parameters |
Data |
Central frequency |
91-857 MHz |
Level range |
45-75 dBuV |
Modulation mode |
64QAM ¡¢256QAM |
Symbol rate |
5.069 Msym/sec(64QAM)
5.361 Msym/sec(256QAM) |
Bandwidth |
6MHz |
Input impedance |
75 ohm |
Input return loss |
≥6 dB |
Euro-DOCSIS spec.
Parameters |
Data |
Central frequency |
112-858 MHz |
Level range |
43-77 dBuV |
Modulation mode |
64QAM ¡¢256QAM |
Symbol rate |
6.952 Msym/sec(64QAM)
6.952 Msym/sec(256QAM) |
Bandwidth |
8MHz |
Input impedance |
75 ohm |
Input return loss |
≥6 dB |
2.2 Upstream (Transmitter)
DOCSIS spec.
Parameters |
Data |
Central frequency |
5-42MHz |
Level range |
TDMA£º
68-114 dBuV £¨32QAM¡¢64QAM£©
68-115 dBuV £¨8QAM¡¢16QAM£©
68-118 dBuV £¨QPSK£©
S-CDMA£º
68-113 dBuV £¨QPSK¡¢8QAM¡¢16QAM ¡¢32QAM¡¢64QAM¡¢128QAM£© |
Modulation mode |
QPSK¡¢8QAM¡¢16QAM ¡¢32QAM¡¢64QAM¡¢128QAM |
Symbol rate |
TDMA:
160K¡¢320K¡¢640K¡¢1280K¡¢2560K¡¢5120K sym/sec
S-CDMA:
1280K¡¢2560K¡¢5120K sym/sec |
Bandwidth |
TDMA:
200¡¢400¡¢800¡¢1600¡¢3200¡¢6400 KHz
S-CDMA:
1600¡¢3200¡¢6400 KHz |
Input impedance |
75 ohm |
Input return loss |
≥6 dB |
Euro-DOCSIS spec.
Parameters |
Data |
Central frequency |
5-65MHz |
Level range |
TDMA£º
68-114 dBuV £¨32QAM¡¢64QAM£©
68-115 dBuV £¨8QAM¡¢16QAM£©
68-118 dBuV £¨QPSK£©
S-CDMA£º
68-113 dBuV £¨QPSK¡¢8QAM¡¢16QAM ¡¢32QAM¡¢64QAM¡¢128QAM£© |
Modulation mode |
QPSK¡¢8QAM¡¢16QAM ¡¢32QAM¡¢64QAM¡¢128QAM |
Symbol rate |
TDMA:
160K¡¢320K¡¢640K¡¢1280K¡¢2560K¡¢5120K sym/sec
S-CDMA:
1280K¡¢2560K¡¢5120K sym/sec |
Bandwidth |
TDMA:
200¡¢400¡¢800¡¢1600¡¢3200¡¢6400 KHz
S-CDMA:
1600¡¢3200¡¢6400 KHz |
Input impedance |
75 ohm |
Input return loss |
≥6 dB |
Connection port£º
Power Supply port£ºInput voltage: 12VDC Rating power: 6W
RF port: F type 75Ω
Network port:
CM-D20B1 adopts Ethernet 10/100Base-T standard Ethernet port to offer easy connection to PC or HUB, providing high quality VOD, audio transfer and information downloading service.
CM-D20B1 adopts USB 1.1 port to enable plug-and-play function. User doesn’t need to install network adaptor but only simple program drive instead to enjoy the high quality internet service via USB port
Indicator
Indicator |
Function |
Work Status |
POWER |
Power supply |
On£ºpower supply normal
Off£ºpower supply abnormal |
STBY |
Standby |
Standby status£¨backup£© |
DS |
Downstream status |
Flickering £ºsearching downstream channels
On£ºchannels located and locked |
US |
Upstream status |
Flickering£ºsearching downstream channels (distance detecting)
On£ºchannels located and distance detecting complete |
ONLINE |
Online status |
Flickering£ºregistering
On£ºregister complete and communication complete |
ENET |
Network status |
Off £ºnetwork connection abnormal
flickering£ºdata sending or receiving
On£ºnetwork connection normal |
USB |
USB status |
Off £ºUSB connection abnormal
Flickering£ºdata sending or receiving
On£ºUSB connection normal |
SNMP Network management
CM-D20B1 supports SNMP network protocol £¬integrated with MIB base, MIB II and MCNSMIB . Remote network management makes it easier for customer service to satisfy the operators and subscribers
Environment£º
Working temprature:0°C-40°C
Humidity:10 %-90 %
Storage temperature:-20°C-60°
Notice
(1)Actual transmission bit rte is usually less than max theoretical value.
(2) CMTS must in A-TDMA transmission mode or S-CDMA mode¡£
(3) A-TDMA or S-CDMA maximally supports 30Mbps bit rate speed
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