Basic Operation and Features
FaultDetection
The 9611B provides intelligent fault detection for all signals based on user settings that define the
input signals.
Time duration
The frequency command is used to set the duration in which a signal can be anticipated to be present.
If the signal is not present in that time duration, an ALARM is triggered. See "Command Line Inter-
face" on page 23
Voltage level
The voltage command is used to set the level at which a signal can be regarded as being present.
See "Command Line Interface" on page 23
Note: It is anticipated that the majority of failure modes will result in a total loss of signal. The signal
will be present or not. Therefore the default 0.25 volt setting is sufficient for the majority of appli-
cations. It is recommended therefore to not change the default setting unless the signal failure mode
is something other than a total loss of signal.
External input faults register an alarm condition in the system no later than 250ms after a TTL Logic 0
is present at either external alarm input (Alarm A or Alarm B).
Timecode SwitchingandDistributionCapability
The 9611B will switch and distribute all digital and RF signals within a bandwidth of 50Hz and 10MHz
and a voltage level of 3Vpp for RF or +5Vp for digital signals.
1PPS Through10MPPSSwitchingandDistributionCapability
The 9611B is designed and tested to switch and distribute all digital time signals from 1PPS through
10MPPS.
RFSwitchingandDistributionCapability
The 9611B is designed and tested to switch and distribute all RF signals from 100Hz through 10MHz
with less than 200ps of additive Jitter.
SerialRemote Management
The 9611B includes a standard RS-232 serial interface on the rear panel using a standard DB-9 type
connector for the Command Line Interface (CLI). See "Command Line Interface" on page 23
TwoAlarmInputs
Two external alarm inputs (Alarm A and Alarm B) are accessed via the rear panel through 50Ω BNC
connectors. These alarm signals are TTL inputs with a TTL High representing Normal Operation and
a TTL Low representing an Input Fault from Source A or Source B. All external input faults will be log-
ically equivalent to the system as an internal input fault.
Page 16
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9611B_UserGuide_RevA.pdf
