P-971M User’s Guide
Chapter 2 Connection Screen.
28
Modulation
This is the method used to encode transmission information, similar to FM or AM on
your radio. The P-971M supports
QAM256
or
QAM64
(Quadrature Amplitude
Modulation) for the downstream channel.
Symbol Rate
The symbol rate (in Kilo symbols/second) for communication from the CMTS to the
P-971M. 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
Power
The power level (in decibels/mili-volt). This value is set by the CMTS.
Upstream
Channel
This is the data path used by the P-971M for sending information to your CMTS.
Lock Status
The P-971M is either
Locked
or
Not Locked
on to the channel advertised by your
cable operator’s CMTS.
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.
Upstream
Frequency
A standard channel frequency (in hertz) from the DOCSIS 2.0 specification.
Modulation
This is the method used to encode transmission information, similar to FM or AM on
your radio. The P-971M supports
QAM16
or
QPSK
(Quadrature Phase
Shift
Keying) for the upstream channel.
Symbol Rate
The symbol rate (in Kilo-symbols/second) for communication from the P-971M to the
CMTS. This is set during initial configuration with a value supplied by the CMTS.
Upstream
Power
The power level (in decibels/mili-volt). This value is set by the CMTS.
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.
Duration
The IP address negotiated with your cable operator has a default lifetime of 7 days
(e.g. D: 00 H: 01 M: 00 S: 00). The sequence (
D -- H -- M -- S --
) indicates that your
modem configuration has failed or is in progress; no IP address duration has been
set.
Expires
This is the expiration date of the IP address, after installation of the modem
configuration file and DHCP negotiation. The default is 7 days (e.g. Wed Jul 02
00:26:23 2005). A sequence of dashes
(--- --- -- -- -- -- ----
) indicates that your
modem configuration has failed or is in progress; no IP address expiry date has
been set.
Current System
Time
This is the current date and time, and is set by your cable operator’s time server.
Table 1
Connection Screen Summary (continued)
LABEL
DESCRIPTION
