Cable modem signal levels for voip to work consistently well the connection to the cable modem should be stable and within certain signal db parameters.
Tx rx snr cable modem.
Downstream power refers to the line signal sent from the cable provider to cable modem.
For all modems docsis 3 0 3 1.
Description how the cable modem identifies itself when queried for system sysdescr.
A value well over 40 may mean you have too much power.
Downstream rx receive power level.
Ubr7246 show cable modem 000b 06a0 7116 cnr mac address ip address i f mac prim snr cnr state sid db 000b 06a0 7116 10 200 100 158 c6 0 u0 online 10 38 this command lists snr when using a c card.
Check the led status at front panel of the idirect modem with the technician rx tx net.
This is the amount of signal received by the modem from the transmitter in the cable company head end.
The rx level is the power in dbm of the received signal.
Are the tx rx and lan cables connected to the idirect modem.
The best way to determine if there are any problems with the cable signal levels that could affect the modems connectivity is to view the cable modem s signal power levels by accessing an interior screen.
Try to ping the modem remotely.
The tx level is the power in decibels per milliwatt dbm at which a modem transmits its signal.
Cable signal levels for all docsis cable modems require to be within the acceptable level for the modem operate properly.
The three signal levels that need to be within the acceptable level are downstream power snr signal to noise ratio and upstream power.
When an s card is used and spectrum groups are assigned cnr is reported.
Ideally the rx level should be in the range of 18 to 25 dbm.
Ip address ip address assigned to the modem not the cpe.
System uptime cable modem s internal time counter time since last power up or reset.
Dns name dns name for the cable modem not the dynamic dns name for the cpe.
Just remember that higher snr means cleaner signal.
If you can ping the modem then telnet into the modem check the rx snr value along with arp table to check if lan is connected to the idirect modem.
If the rx level is under 25 dbm the signal to noise ratio snr is.
Rf mac mac address of the cable rf interface.
