User's Manual

AC65/AC75 Hardware Interface Description

Confidential / Preliminary

AC65/AC75_hd_v00.372 Page 54 of 118 2006-08-03

3.9.1 Installation Advice

The total cable length between the board-to-board connector pins on AC65/AC75 and the

pins of the external SIM card holder must not exceed 100mm in order to meet the

specifications of 3GPP TS 51.010-1 and to satisfy the requirements of EMC compliance.

To avoid possible cross-talk from the CCCLK signal to the CCIO signal be careful that both

lines are not placed closely next to each other. A useful approach is using the CCGND line to

shield the CCIO line from the CCCLK line.

To meet EMC requirements it is strongly recommended to add several capacitors as shown

in Figure 46. Take care to place the capacitors close to the SIM card holder.