JIUZHOU Logo
¡¡
CM-D20B1 Cable Modem
¡¡

 

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



¡¡
Copyright© 2001 - ;Sichuan Jiuzhou Electronic Technology Co.,Ltd All Rights Reserved