New memberUsername: Sword12
Post Number: 1
field on all types of CAMs.
At any given moment, the time shown in the guide is correct, at least on
a properly subscribed system. Ever wonder why that is, what with
Daylight Savings Time, etc.? This document helps to explain how that
Time Zone Byte
There is a field on all subscriber CAMs, that specifies the Time Zone.
As you can guess, to ensure smooth operation, this field is also
emulated in non-legit cards. Now, there is some correlation between the
Time Zone Byte, and the "GMT Offset", but I'll save that for a different
time. Here is the table:
Timezone Standard Time Daylight Savings Time
Hawaii D8 DC
Alaska DC E0
Newfoundland (NST/NDT) F6 F2
Pacific (PST/PDT) E0 E4
Mountain (MST/MDT) E4 E8
Atlantic (AST/ADT) F0 F4
Central (CST/CDT) E8 EC
Eastern (EST/EDT) EC F0
Zip Code Bytes
Along with that, is a Zip Code field. This field, for a customer in the
United States, is simply the Zip Code of the customer, converted to Hex.
Then, when everyone rolls their clocks ahead (or back) to change to
Daylight Savings Time, or back to Standard Time, Dish sends a command to
your CAM, basically checking if the Zip Code is in a certain range, and
if it is, modifying the Time Zone Byte accordingly. So, if you want to
ensure that your IRD time is correct, put in a Zip Code from your Time
Zone, case closed.