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  Coast CATV 
  Equipment Supply, Inc. 
  314 Elizabeth Lane
  Corona, CA 92880
  Tel: (814) 883-7492


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Coast CATV Equipment Supply, Inc.    
Tel: (814) 883-7492    email:

Knovative & Coast CATV Equipment Supply

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Knovative’s CompactCMTS is a high-performance, cost-effective and highly integrated DOCSIS Cable Modem Termination System (CMTS).  The CompactCMTS is a complete, self-contained DOCSIS CMTS. With its internally integrated Upconverter, DHCP, TFTP and TOD servers everything needed to support DOCSIS cable modem operation is provided.  Its compact size and highly integrated design makes the CompactCMTS the most ideal CMTS product for Franchised Cables and for Private Cables, MDUs, SMTVs, campuses and hotel operations.

Knovative offers two models of CompactCMTS.  The KCMTS-122 complies with DOCSIS and KCMTS-122E complies with EuroDOCSIS.  Both models are delivered with software that is fully DOCSIS 1.0 compliant and supports the most frequently used DOCSIS 1.1 features. 


Both KCMTS-122 and KCMTS-122E support one downstream and two upstream channels.  The mechanical design allows it to be installed on a 19” rack or table/tray (with rack mounting handles removed). All interface cables and LED status indicators are located at the front for easy wiring.


                  Knovative KCMTS-122

                                                               Front View  KCMTS-122


KCMTS-122, KCMTS-122E Interfaces, Features and Functions

Front Panel Interfaces

·       Downstream Output – Provides the QAM64 or QAM256 modulated DOCSIS downstream data.

·       Downstream Monitor – for examining the downstream RF signal without interfering with the normal downstream RF signal.

·       US1 Input, US2 Input – Accepts QPSK or QAM16 modulated DOCSIS upstream data.

·       US1 Monitor, US2 Monitor – for examining the upstream RF signal without interfering with the normal upstream RF signal.

·       Network – 10/100BaseT Ethernet (DCE) port that carries data and management packets between the CMTS and the backbone network.  Both internal Web Server and Telnet are available through the Console port for accessing the internal DHCP, TFTP servers and CompactCMTS data base for Cable Modem provisioning.

·       Console – RS232 serial port for monitor and control of the CompactCMTS using the same commands provided by Telnet. This port can be attached to a standard phone modem for continued access during network connection outages. 

Features and Functions

  • Provides downstream signal at DOCSIS frequency range. There is no need for external upconverter.
  • Fully compliant to DOCSIS downstream PHY layer and MAC layer specifications.
  • Supports and compliant to DOCSIS BPI/BPI+ security specifications.


  • Fully compliant to DOCSIS upstream PHY layer specifications including channel equalization.
  • Fully compliant to DOCSIS upstream MAC layer specifications including MAP generation, UCD generation, cable modem ranging, MAC de-framing, frame error detection, MAC message extraction and PDU frame deconcatenation.
  • Supports and compliant to DOCSIS BPI/BPI+ specifications.


  • Layer-2 bridging, supports DOCSIS spanning-tree protocol.
  • Flexible CM provisioning using either internal DHCP, TFTP servers or optional external servers.
  • Built-in Time-of-Day server for cable modem support.
  • Supports DOCSIS IGMP Proxy and IP Multicast.

Operational Support System (OSS)

  • Native CMTS control/status

§        Intuitive built-in Web Server.  Use standard Internet Explorer or other web browser to access. Different access control groups for monitoring, setup or administration.

§        SNMP MIBI/II access supports both DOCSIS standard and Private MIBs.

§        Telnet access

§        Consol port access

  • Provisioning similar to DOCSIS cable modem provisioning
  • DHCP client retrieval of CMTS IP address, handle to CMTS configuration file.
  • TFTP client retrieval of CMTS configuration file, software/firmware update files.
  • Internal DHCP, TFTP and Time of Day Servers make this a standalone system.  DHCP can provide either IP address pools or static IP address assignment to both CMs and CPEs.
  • Provisioning can also forward DHCP/TFTP to external servers in full compliance with DOCSIS requirements.


KCMTS-122, KCMTS-122E Specifications



Downstream Physical Layer

Quantity of downstream channel


Modulation type

64 and 256 QAM (ITU-T J.83 Annex B)

Frequency Range

88 to 860 MHz  (KCMTS-122)

108 to 862 MHz (KCMTS-122E)

Signal Level

50 to 61 dBmV, adjustable at 0.5 dB steps

Channel Bandwidth

6 MHz (KCMTS-122), 8MHz (KCMTS-122E)

Symbol Rate (nominal)



KCMTS-122:                                    KCMTS-122E

5.056941 Msym/sec                          6.952 Msym/sec

5.360537 Msym/sec                          6.952 Msym/sec

Frequency Response

~ 18% Square Root Raised Cosine shaping

~ 12% Square Root Raised Cosine shaping

Spurious and Noise

   Inband discrete (fc +/- 3MHz)

   Inband spurious & noise (fc +/- 3MHz)




   Adjacent channel

       (fc +/- 3 MHz) to (fc +/- 3.75 MHz)

        (fc +/- 3 MHz) to (fc +/- 9 MHz)


   Next adjacent channel

        (fc +/- 9 MHz) to (fc +/- 15 MHz)


   Other channels

        47 MHz to 1,000 MHz


< -57 dBc in 6 MHz

< -48 dBc in 6 MHz; where channel spurious and noise includes all discrete spurious, noise, center leakage, clock lines, synthesizer products, and other undesired transmitter products.  Noise with +/- 50 KHz of the carrier is excluded.


< -58 dBc in 750 KHz

< -62 dBc, in 5.25 MHz, excluding up to 3 spurs, each of which must be -60 dBc when measured in a 10 KHz band


< -65 dBc in 6 MHz



< -12 dBmV in each 6 MHz channel

Phase Noise

1 KHz to 10 KHz: -33 dBc double sided noise power

10 KHz to 50 KHz: -51 dBc double sided noise power

50 KHz to 3 MHz: -51 dBc double sided noise power

Output impedance

75 Ohms

Output Return Loss

> 14 dB with an output channel up to 750 MHz;

> 13 dB in an output channel above 750 MHz

Connector Type

F type

KCMTS-122, KCMTS-122E Specifications (continued)


Upstream Physical Layer

Quantity of downstream channel


Modulation type

Burst (TDMA) QPSK and QAM16

Frequency Range

5 to 42 MHz  (KCMTS-122)

5 to 65 MHz (KCMTS-122E)

Tuning Resolution

1 Hz

Level Range (one channel)

160 Ksps: -16 to +14 dBmV

320 Ksps: -13 to +17 dBmV

640 Ksps: -10 to +20 dBmV

1.28 Msps: -7 to +26 dBmV

2.56 Msps: -4 to +26 dBmV

Total Input Power

Not to exceed + 35 dBmV (95dBuV)

Burst Length

1 to 255 minislots

Minislot size from 6.25 to 800 us

FEC Coding

Variable burst to burst:

   Reed-Solomon T = 1 to 10 or 0 (off)

   Codeword size 16 to 255 bytes


Burst Synchronous, programmable seed

Symbol Rate (nominal)

160, 320, 640, 1,280 and 2,560 Ksym/sec


200, 400, 800, 1,600 and 3,200 KHz

(-30 dB, 25% SRRC)


Decision Feedback, 5 taps FF, 4 taps FB

Connector Type

F type


MAC Layer

Upstream Forwarding Rate

17 K packets/sec max

10 Mpbs (limited by upstream modulation type chosen)

Downstream Forwarding Rate


64 QAM: 50K packets/sec or 28 Mbps

256 QAM: 66K packets/sec or 38 Mbps

Broadcast Packet Forwarding Rate

Limited to 1000 packets/sec to guard against denial of service attacks.

Media Service Access Point (MSAP)

1 MSAP to 8190 MSAP Unicast Service IDs

100 Multicast Service IDs

CM Support

Up to 512

CPE Support

Up to 8192 CPEs.  Up to 16 CPE devices per CM.

CM Registration Filtering

Reject or exclusively accept up to 5 sets of CM Ethernet address ranges.

Minimum MAP Time Interval

2 ms

Downstream QoS

DOCSIS rate limiting method. Elastic buffering of up to 800 ms total downstream data.

Ethernet Address Forwarding

Support for 32768 IDs.

Upstream Packet Concatenation


Upstream Piggyback Requests


Maximum CM Distance setting

Decrease upstream latency for CM data.


KCMTS-122, KCMTS-122E Specifications (continued)


AC Power


Typical Value

Maximum Value

Nominal Input Voltage

115V to 240V


Input Voltage Tolerance


+/- 10%

Input Frequency

50 Hz / 60 Hz


Input Frequency Tolerance


+/- 2%

Input Power

150 W






19 inch rack or table/tray mount


3.5” H (2 RU) x 17.2” W (18.25” with rack mounting flanges) x 12.7” D


16 lbs rack mounted

Shipping Weight

23 lbs




Operating Temperature Range

0oC to 50oC

Storage Temperature Range

-40oC to -125oC

Operating Humidity

10% to 90% non-condensing








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