Cambium Networks PTP 820 Series User Manual page 710

Chapter 14: Getting Started (CLI) Configuring Unit Redundancy for the PTP 820 Split Mount (CLI)
Note
On some occasions, in links with TDM traffic, if you disable unit redundancy then re-enable unit
redundancy later, a TDM-LIC configuration mismatch alarm may be raised (Alarm ID 2002). If this
happens, you must reset the unit with the alarm, then perform copy-to-mate.
phn-3965_006v002
Page 14-15