SMD 989
– User Manual
Page 14 (105)
Pin 2: Relay
1 Common
Pin 4: Relay
2 Common
Pin 1: Relay 1
Normal Closed
Pin 3: Relay 1
Normal Open
Pin 6: Relay 2
Normal Closed
Pin 5: Relay 2
Normal Open
10 MHz Reference Input
The clock input (CLK IN) is used when a reference with enhanced stability is needed or when
several modulators need to be synchronized to the same clock source. The level should be 0
dBm nominally or within a range of -3 to +7 dbm.. The unit automatically senses and switches
between the internal or external reference based on presence detection. By default, the internal
clock reference is used. When an external clock input is sensed, the unit automatically locks to
the incoming reference.
10 MHz Reference Output
The clock output (CLK Out), not shown in figure 1, is used to provide a sample of the internal
reference clock
when it is desired to synchronize other equipment to the modulator’s reference
clock or output. The output level is approximately 0 dbm. This output is subsequently and
automatically locked to a 10 MHz reference input when an input is applied to the 10 MHz
Reference Input.
Control Ethernet Connection
A standard RJ-45 connector provides connection to the SNMP and Web Interface of the SMD
989 platform. The connection is a 10/100 BaseT connection. A user can view the IP address of
the unit from the front panel or once known can access the web interface through any supported
web browser by typing the IP address of the unit. The control port is capable of both DHCP and
static IP addressing. By default the IP address of the SMD 989 is statically set to 10.0.0.60.
Supported Web Browsers include:
Internet Explorer 7 & above
Firefox 3.5 & above
Google Chrome
Figure 3: Contact closure pin connection
