CATV Interfaces specifications for the ComPORT Cable Modem

Transmit (Upstread) Parameters

Specifications

Carrier Power dynamic Range:

40 dB

Carrier Power Setting

18 to 58 dBmV

Frequency range

5MHz to 40MHz in 50KHz steps.

Channel Bandwidth

1.28MHz@ -3dBc
1.8MHz@ -30dBc
1.9MHz@40dBc

Return Loss:

10dB Typical, (5 to 40MHz)

Modulation:

QPSK

Symbol Rate:

1.28Msps (Million Symbols Per Second)

Impedance:

75 W

Receive (Downstream) Parameters

Specifications

Carrier Power Operating Range:

+/- 15dBmV Automic (AGC)

Carrier Frequency range:

300MHZ to 800MHz in 200KHz steps. or 88MHz to 400MHz in 200KHz steps.

Carrier Power Measurement Range:

Approx. -25 to + 19dBmV (Typical)

Return Loss:

>_ 14dB

Modulation:

64QAM

Symbol Rate:

5.056MSPS (Million Symbols Per Second)

Group Delay Tolerance:

200ns/6MHz

Impedance

75 W