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Let’s break the string into recognizable components used by Cisco Systems (the dominant manufacturer of enterprise APs):

If you are using this for a lab, immediately disable Telnet and SSH v1 after boot. The 15.3(3)JN1 code has known vulnerabilities (CVE-2019-1265) that were fixed in later versions—but since you are here for stability over security, isolate the AP to a management VLAN.

Some 3702 models support Mobility Express (no external controller). This removes the bottleneck of an old WLC. Convert using: