User Guide

Nokia Customer Care System Module
RH-37
Issue 1 07/04 Nokia Corporation Page 37
Table 11: System connector interface description
Pin # Signal Notes
1 VCHAR
2 GND Charge ground
3 ACI Insertion & removal detection /
Serial data bi-directional 1 kbit/s
4 Vout Power supply for external accessories
5 Not used in RH-37
6 FBUS_RX Serial data from accessory to phone /
115 k b it/ s
7 FBUS_TX Serial data from phone to accessory /
115 k b it/ s
8 GND Data ground
9 XMIC N Negative audio in signal
10 XMIC P Positive audio in signal
11 HSEAR N Negative audio out signal.
12 HSEAR P Positive audio out signal.
13 HSEAR RN Negative audio out signal.
14 HSEAR RP Positive audio out signal.