Valid entries are 20 to 1000, in increments of 10. The number that you type in this field must be greater than the number that you type in the Received Digital Metering Pulse Minimum (ms) field.
The system displays this field only when the Signaling Mode field is set to cas, the Interconnect field is set to co or pbx, and the Country Protocol field is set to a protocol that uses PPM as defined in Country protocol codes for incoming digital PPM signaling.