ZyXEL Communications P-974H - V3.70, Manual

Page: 33 / 116

Chapter 3 Status
P-974H/HW Series User’s Guide
33
The following table describes the labels in this screen.
Table 5 Status: CONNECTION
LABEL DESCRIPTION
Startup
Procedure To establish a successful connection to the cable provider’s network,
the ZyXEL Device must go through a series of well-defined
initialization steps.
This table shows the line initialization information. For detailed
information for each initialization step, refer to
Table 6 on page 35 .
Procedure This field displays the name of the initialization step.
Status This field displays the status of the initialization step.
Comment This field displays the status message of the initialization step.
Downstream/
Upstream
Channel This is the data path used by the cable operator’s CMTS for sending/
receiving information to/from your ZyXEL Device.
Lock Status The ZyXEL Device is either Locked or Not Locked on to the channel
advertised by the cable operator’s CMTS.
Modulation This is the method used to encode transmission information, similar to
FM or AM on your radio.
The ZyXEL Device supports QAM64 (Quadrature Amplitude
Modulation) or QAM256 for the downstream channel.
The ZyXEL Device supports QAM16 or QPSK (Quadrature Phase Shift
Keying) for the upstream channel.
Channel ID A standard channel number from the DOCSIS 2.0 specification.
Channel numbers and channel frequencies are specified in pairs in
DOCSIS 2.0.
Symbol Rate The symbol rate (in Kilo symbols/second) for communication between
the cable operator’s CMTS and the ZyXEL Device. This is set during
initial configuration with a value supplied by the CMTS. Typical values
for QAM64 are 5.05 Mega-symbols/second, and for QAM256 5.36
Mega-symbols/second.
Downstream/
Upstream
Frequency
A standard channel frequency (in hertz) from the DOCSIS 2.0
specification.
Downstream/
Upstream
Power
The power level (in decibels/mili-volt). This value is set by the cable
operator’s CMTS.
SNR This field is applicable for Downstream Channel.
The SNR (Signal to Noise Ratio), in decibels/mili-volt, is the ratio of
signal power to channel noise power. This value is set by the cable
operator’s CMTS.
Current System
Time
CM IP Address This is the IP address negotiated with your cable operator, after a
successful download of the modem configuration file and DHCP
negotiation (e.g.10.21.0.11). This field may also be blanked out with a
series of dashed lines (--- --- --- ---) indicating that the modem
configuration failed or is in progress; no IP address has been set.