# System Channels

System Channels refer to channels that are not included in the user configurable channel settings. These channels are data points that the Catalyst monitors continually.

These data points include:

- Phone Failures
- Power Failures
- Battery Charging
- Time of Day Clock Reset
- Log File Overflow

Let "Nchans" be the maximum number of user-configurable channels for a given model number.

The "Channel Number" field of any channel status message formatted as "comma delimited keys" will be:

|  | Number of Channels
--- | --- | ---
Data Point | SysChan | 256 | 96 | 56
Phone Failure | Nchans + 1 | 257 | 97 | 57
Power Failures | Nchans + 2 | 258 | 98 | 58
Battery Charging | Nchans + 3 | 259 | 99 | 59
Time of Day Clock Reset | Nchans + 4 | 260 | 100 | 60
Log File Overflow | Nchans + 5 | 261 | 101 | 61