Clear-Com RS-603 (No longer available) - Manual (Page 28)

2 6 R S - 6 0 3 / 6 2 3 / R B E L T P A C K S
Headset Connector Pinouts
PIN FUNCTION
603 623 603R 623R
1 Mic (L) Mic (L) Mic (L) Mic (L)
2 Mic (H) Mic (H) Mic (H) Mic (H)
3 Headphone (L) Headphone
common
Headphone (L) Headphone
common
4 Headphone (H) Ch. B
headphone (H)
Headphone (H) Ch. B
headphone (H)
5 Ch. A
headphone (H) Ch. A
headphone (H)
6 Headphone
common