This read-write value sets the default maximum number of CPE devices permitted behind each subscriber unit on this wireless interface, unless an individual SU overrides it via cwdxHeSuMaxCpeNumber. Admins use it to enforce a baseline limit on how many customer devices can share one SU's connection, with 0 meaning no limit and matching the factory default. For example, an operator wanting to cap shared connections to five devices per SU by default would set cwdxHeSuDefaultMaxCpes to 5, while noting that already-connected CPEs are unaffected by the change.