User's Manual

www.vyyo.com
The Modem Initialization Process – p. 30
3.1.6 Establish Time of Day
The modem uses the ToD server address(es) just received to send a Time of
Day request to the ToD server(s). This is combined with the time offset
received in the DHCP response to calculate the current local time. The Time
of Day is used by both the modem and the WMTS to timestamp logged
events (accessible via the Network Management System).
3.1.7 Transfer Operational Parameters
The modem then requests the TFTP server to send the configuration ( or
“boot”) file named in step (5) above during the establishment of IP
connectivity. If the boot file specifies a different upstream channel and/or
downstream frequency, the modem must repeat its initial ranging using this
new upstream channel and/or downstream frequency.
3.1.8 Registration
In order to forward traffic into the network the modem must be “registered”
with the WMTS. To register, the modem sends the WMTS its class of
service (also called QoS for Quality of Service) and any other operational
parameters it received in the configuration file as part of a Registration
Request. As part of the registration process the modem calculates Message
Integrity Check (MIC) values using the parameters specified in its
configuration file. This must match the values given for those parameters in
the configuration file itself.
3.1.9 Baseline Privacy Initialization (BPI)
If the modem is enabled to run BPI then encryption and decryption keys are
established. All further data to or from the modem is now encrypted. The
keys have a lifetime and are automatically reset to new values after a
specified period which may be set by the operator using the NMS.
NOTE: BPI is required in order to support E1/T1