Cable Modem Info - DNS Name - DNS name for the cable modem,
not the dynamic DNS name for the CPE.
- RF MAC - MAC
address of the cable RF interface.
- 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.
- Description - How the cable modem identifies
itself when queried for system.sysDescr.
- Software Version - Current
version of the software of firmware running in the cable modem.
- DOCSIS
Config - DOCSIS complaint config file downloaded by the modem as
part of registration with the CMTS after syncing up. Config files
follow the format II-CC-NN.cfg where:
- II = ISP code
- CC =
Class of service (D = dynamic, S = static, C = capped, U = uncapped)
- N
= Number of allowed CPEs
- CMTS Router - Cable
Modem Termination System router.
RF Statistics - Resets - Generally, the number of times a
modem has reset itself or been reset since the last power-up. Some
modems appear to not reset this counter when power-cycled.
- Lost
Syncs - Number of times the modem and the CMTS have lost sync over
the cable RF network. This counter is always reset at power-up. Some
modems may also reset this counter when reset.
- Downstream
Frequency - The 6-MHz wide frequency and cable channel that the
CMTS is using for the downstream packets to the cable modem. AFN has
six downstream channels, each with a QAM-256 digitally modulated
carrier.
- Downstream Signal to Noise Ratio - Decibels of
coherent signal for each decibel of noise on the downstream QAM-256
stream, as measured by the cable modem. Larger numbers are better.
Should be above 35 dB. Modems at 33dB and above operate very well.
- Downstream
Microreflections - RF signal reflections, measured by decibels in
reference to the carrier. This value is generally between 0 and 30 dBc.
- Downstream
UnErrored Codewords - Number of codewords received by the cable
modem's RF interface without error, regardless of destination. Each
modem will see all downstream traffic, but will only bridge packets
destined for it's own MAC address.
- Downstream Corrected
Codewords - Number of errored codewords received and successfully
corrected. Error correction is a part of standard operating procedure
for RF networks. High corrected codeword counts are not to be
considered a problem unless accompanied by high uncorrected codeword
counts as well.
- Downstream UnCorrected Codewords - Number
of errored codewords received that could not be successfully corrected.
This count should be well below 1% of the total codeword received.
- Downstream
(Rx) Power - Downstream signal level measured at the cable modem in
decibels per millivolt. Target level is 0 dBmV. Values between -10
dBmV and 5 dBmV are acceptable.
- Upstream (Tx) Power - Upstream
signal level, as sent from the cable modem, measured in decibels per
millivolt. DOCSIS specifies a range of 8 dBmV to 58 dBmV for QPSK
modulation. Levels between 30 dBmV and 50 dBmV are best. If this
number is at or above 54 dBmV it indicates a serious problem.
- Upstream
(Rx) Power (at CMTS) - Upstream signal level, as received by the
CMTS, measured in decibels per millivolt. DOCSIS specifies -4 dBmV to
26 dBmV for QPSK modulation. Target level at the CMTS is 0dBmV.
- Upstream
Signal to Noise Ratio (at CMTS) - Decibels of coherent signal for
each decibel of noise for the upstream QPSK packets, as measured at the
CMTS. Larger numbers are better. DOCSIS specifies 25 dBmV or greater.
SNR/CNR values of 24 dBmV or greater are acceptable.
- Upstream
Frequency - The 3.2 MHz wide frequency and upstream channel used by
the modem to send its upstream QPSK packets to the CMTS. The channel
number is used by the CMTS, and has no realtion to EIA cable channel
numbers.
MAC Table - CPE Device - MAC address of a CPE device
connected to the cable modem. Expect to see the MAC address of your
router, firewall or PC's ethernet card here.
- Cable Modem RF -
MAC address of the cable modem's RF interface. This is the MAC
seen by the CMTS and the DHCP server.
- Cable Modem RF
(internal) - Additional MAC address of the cable modem's RF
interface. This MAC is only present in a small percentage of modems,
and is not seen by the CMTS or the CPE.
- Cable Modem Ethernet -
MAC address of the ethernet interface on the cable modem. On most
modems this will be different than the RF MAC.
- Cable Modem
USB - MAC address of the USB interface (if present) on the cable
modem. Depending on make and model of the modem, may be the same as the
RF MAC, ethernet MAC or unique to the USB interface.
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