User's Manual

Summit User’s Guide – SDC-SSD40L

SDC-SSD40L_UsersGuide

Figure 4: Bottom layer

On the bottom layer, a complete ground plane under the SSD40L is must to ensure the rf signal is

well referenced. Also, the RF trace impedance between the SDC-SSD40L (Pin 56) and the antenna

connector (J1) should be controlled within 50 ohm +/-10% and keep the trace as short as possible

(recommend less than 100 mils) to reduce the trace lose. Place 10 mils through via hole with distance

40 mil around the RF connector (J1) and beside the RF trace to avoid the possible radiation for

harmonic signal.

C. Antenna Specification

An external dipole antenna was tested with SSD40L to get Summit certification ID (FCC, IC, and

ETSI). Detail information will be obtained on

http://www.cisco.com/en/US/docs/wireless/antenna/installation/guide/4941.html

Note: Section 15.203 of the FCC Rules requires a unique antenna connector between the modular

transmitter and the chosen antenna. The specified antenna meets this requirement since it

uses a reverse polarity TNC connector but a length of antenna cable must be provided

between the MMCX modular transmitter connector and the reverse polarity TNC connector on

the antenna.