Novus ND2310D User manual

USERS MANUAL
ND2310D
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DATE
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ND2310D
10 Channel Distribution Amplifier
Available Options:
•Ethernet Monitoring
•DC Input
•Square Wave
•PPS
•SNMP
•CAN Bus (for use with Novus redundant systems)
All information provided herein is the property of Novus Power Products LLC.
The information included may be reproduced without the permission of Novus
Power Products LLC for the purpose of operating the equipment.

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Contents
Safety................................................................................................................................... 3
Mounting.............................................................................................................................. 4
Summary.............................................................................................................................. 5
Controls and Indicators –Front Panel................................................................................. 7
Channel Status ................................................................................................................. 8
Status LEDs ..................................................................................................................... 9
Input Status...................................................................................................................... 9
Power Supply Status...................................................................................................... 10
Amplitude Alert Threshold............................................................................................ 11
Input Threshold.............................................................................................................. 15
Input Select (when used with Novus select references) ................................................ 16
Latch Channel Values.................................................................................................... 18
Save Configuration ........................................................................................................ 18
Fault Status .................................................................................................................... 19
Power Switch................................................................................................................. 20
Distribution Amplifier Cabling - Synchronizing NR2310D-O/G and ND2310D ............ 20
Distribution Amplifier Cabling - Synchronizing Two NR2110D-O/G and ND2310D:... 22
RS232 DB9 Port ............................................................................................................ 23
Rear Panel.......................................................................................................................... 24
Channel Outputs –BNC or SMA.................................................................................. 24
Signal Input A/B............................................................................................................ 24
DC Input ........................................................................................................................ 25
AC Input ........................................................................................................................ 25
RS232 DB-9................................................................................................................... 25
CAN Connector (optional) ............................................................................................ 26
Functional Description ...................................................................................................... 28
Bandwidth...................................................................................................................... 29
Phase Noise.................................................................................................................... 29
Outputs........................................................................................................................... 30
Built-in Test................................................................................................................... 30
Power Supplies .............................................................................................................. 30
Programming Guide (RS232 Port: Front and Rear).......................................................... 31
RS232 Commands ......................................................................................................... 32
Status String ($GPNVS) Channel Measurements ......................................................... 34
SNMP Reference ........................................................................................................... 34
Specifications..................................................................................................................... 35
Technical Specifications................................................................................................ 35
Environmental and Mechanical..................................................................................... 36
LIMITED HARDWARE WARRANTY .......................................................................... 37

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Safety
This product has been designed and manufactured to recognized safety
standards and rules. The product is a sophisticated electronic instrument that
should be installed and operated by highly trained professionals.
Installation of this equipment should comply with all local electrical codes.
Utilization of this equipment in a manner inconsistent with the operating
instructions can be dangerous.
DANGER
There are no user serviceable parts within the unit. Removal of the cover to
access interior parts will expose the user to dangerous voltages.
DANGER
The unit may be powered from more than one power source. Care must be taken
to be certain all power sources are removed before installation or during removal
of the equipment.
DANGER
The unit must be operated with a secure earth ground to the chassis. The
electrical path for earth ground is through the power connector. The power
switching device that controls power to the equipment must never interrupt the
chassis ground connection.
The equipment contains complex electronic components that can be damaged by
electrostatic discharge. Observe all recognized standards for the handling of
complex electronic devices to avoid high voltage discharge to the equipment. Be
certain the equipment chassis and operator are at equipotential before handling
the equipment.

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Mounting
The equipment is meant to operate in a horizontal - top up configuration.
The equipment is meant to mounted into a 19 inch standard NEMA cabinet. The
unit occupies a single “1RU”. Mounting spaces above and below the equipment
may be used as required.
Please observe the operating temperature range for the equipment. If mounted
into a closed rack, be certain that the total heat load in the cabinet does not result
in an interior operating temperature that exceeds the equipment maximum rated
temperature.
If cooling must be used, care should be given to prevent cooling mechanical
vibration from the coupling into the equipment. Mechanical shock and vibration
may introduce noise into the electronic signals inside the equipment that may
degrade the performance of the equipment.
For applications where there is significant shock and vibration, Novus offers
equipment with interior mechanical design features to minimize the effects of
vibration and shock on the equipment performance.

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Summary
The ND2310D is a ten channel wide-bandwidth distribution amplifier. While
primarily used for 10 MHz reference distribution, it has a functional bandwidth
from DC to 12 MHz but is filtered for the lowest phase noise at 10MHz. For
applications other than 10 MHz the unit must be factory configured.
The platform is also available for pulse distribution. PPS or 10 MHz Square wave
at either 3.3 or 5 Vdc levels. It has an internal sine to square wave converter if
the square wave option is selected. The pulse and sine versions are not
interchangeable.
The sine linear amplifiers are low phase noise design to preserve the integrity of
the reference signal. All outputs are transient, and fault protected. The unit is set
up with ten outputs and dual inputs A and B. Gain is factory set for 0 dB.

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The amplifier can also be optionally redundantly powered. The redundancy
feature adds a second power supply which may be AC or DC. The dual input
design monitors the input signals and selects the active signal or the prioritized
signal. Each output channel is monitored against a defined set of thresholds. If a
fault is detected, monitoring will report the fault serially,
The unit features extensive reporting via the rear panel RS232 port - equipment
status, output voltage on each channel and redundancy status. By being able to
monitor the output voltage, the user can detect cabling issues that cause an
impedance change and replace cabling before it completely fails. Reporting is
also easily accessible via the front panel display.
SNMP v02 is also available for remote monitoring and control. Appendix D
details the capability and features.
Nominal power is global AC power, but a DC power option can be ordered that
acts as the back-up power supply. Nominally 24 Vdc, this port is used for power
when AC power fails. Switching between power sources is automatic and there is
no transient power outage at the equipment level. The primary power supply is
followed by low noise linear converter assemblies. DC power in the range of -
60Vdc to +60 Vdc can be accommodated in three unique ranges.

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Controls and Indicators –Front Panel
This section describes the functionality of the front panel controls and indicators.
Two buttons above the status LEDs provide navigation through the menus.
In general, the NEXT button advances through the menus to the next screen,
while the SELECT button chooses between the available values on a menu.
Menus that allow selectable adjustments are the Input Threshold, Alert
Threshold, and the Attenuation setting. To adjust these values from the front
panel, hold down both buttons for two seconds, until the value begins to flash.
To leave the menu with the new value, hold down both buttons until the value is
solid.
Screen Saver: After one hour, the OLED display will turn off, unless activated by
a fault condition, or by a user input, such as pressing the NEXT or SELECT
buttons.

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Channel Status
The channel status can be determined by reading the actual RMS value on the
output of each stage. This is compared to a threshold limit that is set by the user
as a percentage variation from a saved value. The default variation value is set at
±25% percent from the current state of the amplifier and is user-programmable in
5% increments from ±10% to ±60%.
For pulsed applications, the reported amplitude is the logic level one amplitude.
The range of acceptable channel amplitude can be narrowed around a
connected balanced line, so that a channel status below the alert threshold
indicates a shorted line, while a channel status above the alert threshold window
indicates a potential disconnected cable.
The threshold value at which a channel alert is triggered can be programmed on
the alert threshold screen or programmed via the RS232 port. Once set, the unit
would continue to monitor each channel and a deviation beyond the set limits
would be reported as a failure on the front panel and via RS232.
The channel status feature can quickly detect a cabling failure. Any change in
the load impedance will change the output voltage with respect to the divider
formed by the output impedance of the amplifier and the load impedance. Failing
cables and connectors can be detected early.
The current threshold limits are displayed in addition to the actual measured
value. These values reflect the percentage threshold defined in the alert
threshold settings. If the output value is too low to give a valid reading, the
display will read “LOW.”
The status is displayed on the front panel and is accessible over the RS232
serial bus via DB9. Channel statuses can be cycled into view or can remain on a
single channel. This feature can be accessed via the NEXT button, by advancing
to the channel status screen. To cycle through channels in sequence, press the
SELECT button.

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Status LEDs
There are three status LEDs which provide a quick indication of valid unit
operation.
Alert LED: The alert LED will illuminate flashing red to indicate an input
failure or a power supply failure. The alert LED will not flash red if any
valid input signal is present.
Fault LED: One of the output channels has been faulted.
Oven: Not used - set to steady Green
Input Status
The status of either input (A or B) can be monitored from the input status screen.
The input values a displayed in Vrms. When an input is selected, an arrow
appears next to the value indicating that the source on that input is relayed to the
output channels.
If no input is present, or the input selection priority does not have an input value
which is above the input threshold, the alert LED flashes red, and the screen
indicates “Connect Source.” The error is also noted in the fifth field of the
$GPNVS string, with the following values:
0 = At least one valid input is available and is relayed to the channel
outputs.
1 = Input A is selected and is below the input threshold.
2 = Input B is selected and is below the input threshold.
For pulsed applications, the input signal can be 3.3 or 5 Volt CMOS. The input
impedance is 1000 Ohms.
For details on the status strings, see section 5.0 Programmer’s Guide.
When using a Novus frequency reference, there is a separate (optional) CAN bus
between the unit and the references. The CAN bus communicates to the

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distribution amplifier and the references, a complete status of the reference.
Information regarding internal BIT, lock, frequency error are all communicated to
make an A/B selection while in the Auto mode. In the manual mode, the
distribution amplifier will remain connected to the manually selected A or B
regardless of the source status.
Power Supply Status
The power supply status screen provides DC voltage values of the two available
power supply sources. The 90-250V AC input is internally connected to an
internal 24V AC-DC convertor which powers the internal supplies with 24V. This
is diode-connected with the external 24V DC input, which can be used in addition
to, or in place of, the AC input.
The values of both DC supplies are measured internally to validate connections.
The measured values of the AC/DC convertor and the DC input are reported in
the third and fourth fields of the second $GPNVS status string.
For details on the status strings, see section 5.0 Programmer’s Guide.
In addition to direct value measurements, each redundant system has a power
supply status byte which is reported in the third $GPNVS status string, in the
seventh and eighth fields respectively.
Any measurement of the power supply which results in an alert condition will be
reported in the power supply status byte.
0x80 = External AC not connected.
0x40 = External DC not connected.

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Redundant power supplies operate on either the AC input or DC input, and
function independently. All functionality and reporting for an individual power
supply and amplifier is independent of its redundant copy.
Amplitude Alert Threshold
The alert threshold screen allows the user to adjust the tolerance from the
reference voltage which, if exceeded in either direction, the output channels will
report a fault status. The default threshold value is set at ±25% percent from the
current state of the amplifier, and is user- programmable in 5% increments, from
±10% to ±60%.

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Each channel has a reference voltage which can be set, all at once, by
latching the channel’s current value in the latch channel average screen.
Each channel’s reference voltage can be set individually by writing the
value serially with the $SET command. After saving the current
configuration on a channel, any subsequent deviation on that channel
which exceeds the alert threshold percentage will trigger an alert.
Steps to ensure correct alert configuration:
1. Connect source input(s) to channel A and/or B.
2. Connect distribution cabling to channels 1 through 16.
3. Set alert threshold to desired range.
4. Save current channel voltages with the latch channel values
screen.
5. Save current settings on the save configuration screen.
Note: Alert threshold can be different for Input A and Input B, allowing for
variation in the input source. To accommodate both inputs, set alert
threshold for Input A and Input B.

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The alert threshold can be optimized so that a channel short or an
impedance change will cause an alert.
Example:

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The output of Channel 1 is connected to a high impedance input and
reports 1.25Vrms at the output. The output of Channel 2 is connected to a
50 Ohm terminated input and reports 0.90Vrms at the output.
Input A is connected to a ~0.95V 10MHz source.
Alert threshold for input A is set to +/-20%.
The current state is saved in the save configuration screen.
The Channel 1 Alert will report when:
-The Channel 1 output is higher than 1.50Vrms
-The Channel 1 output is lower than 1.00Vrms
-
-
The Channel 2 Alert will report when:
-The Channel 2 output is higher than 1.08Vrms
-The Channel 2 output is lower than 0.72Vrms
Pressing the SELECT button toggles the view between the A and B input
alert threshold settings.
To adjust the alert threshold from the front panel, hold the NEXT and
SELECT buttons down simultaneously for two seconds. The percentage
value will begin flashing. To increase the value, press the SELECT
button. To decrease the value, press the NEXT button.
When the desired value is reached, press the NEXT and SELECT button
simultaneously to leave the settings mode.
The alert threshold settings can be modified via the RS232 serial port with
the $FLTTHRA and $FLTTHRB commands.
For details on the alert threshold, see section 5.0 Programmer’s Guide.

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Input Threshold
The input threshold screen allows the user to monitor and set the threshold at
which the input is regarded as invalid or faulted.
The input threshold value is the absolute voltage (user-programmable between
0.1Vrms and 1Vrms) below which the input fault will occur, and the auto input
select will consider the signal invalid. The default minimum value is set to
0.3Vrms.
Pressing the SELECT button toggles the view between the A and B input
threshold settings.
To adjust the input threshold from the front panel, hold the NEXT and SELECT
buttons down simultaneously for two seconds. The percentage value will begin
flashing. To increase the value, press the SELECT button. To decrease the
value, press the NEXT button.
When the desired value is reached, press the NEXT and SELECT button
simultaneously to leave the settings mode.
The input threshold settings can be modified via the RS232 serial port with the
$INPTHRA and $ INPTHRB commands.
For details on the input threshold, see section 5.0 Programmer’s Guide.

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Input Select (when used with Novus select references)
The input select screen allows the user to monitor and select the input priority for
inputs A and B. Pressing the SELECT button with advance through the following
settings:
oInput A Select
oInput B Select
oAuto Select (Priority A)
oAuto Select (Priority B)
Example: Input select is set to Auto (A). Input A threshold is set to 0.5Vrms.
Input B threshold is set to 0.5Vrms.
Input A
Input B
Selection
0.90V
0.4V
A
0.90V
No Connection
A
No Connection
0.6V
B
0.4V
0.6V
B
No Connection
No Connection
Last Selected
The default setting is Auto (A). Input A select and Input B select will select only A
or B respectively.
Input select priority can also be programmed via the RS232 port with the $INP
command:
o$INP=0: Input A Select
o$INP=1: Input B Select
o$INP=2: Auto Select (Priority A)
o$INP=3: Auto Select (Priority B)
The input source can also be selected automatically based on Lock Status or
Holdover Status, with an optional CAN connector between the ND2310 and
NR2110 units supplying input signal.

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Switch input on loss of GNSS lock
To select Priority Input on Lock (must have CAN connection to NR2110):
o$PRLK=1 via serial port
o$INP=2 or $INP=3
If the input source indicates loss of GNSS lock, the ND2310 will select the
backup signal if the backup unit reports GNSS lock is valid.
Switch input on expiration of holdover
To select Priority Input on holdover (must have CAN connection to NR2110):
o$PRHR=1 via serial port
o$INP=2 or $INP=3
The ND2310 will select the primary input as long as the primary unit reports
holdover is valid, regardless of loss of GNSS lock. The holdover period can be
adjusted with the $HOP command via the serial port.
o$HOP=<n> (where n is [s], default n = 86400)
For details on the input priority programming, see Programmer’s Guide.

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Latch Channel Values
The latch channel values screen allows the user to save the current channel
output values for use as the reference value for alert settings.
A channel alert is triggered when a channel output voltage exceeds or falls below
a percentage of the reference value. This reference value is 1.10Vrms as a
default but can be set by the user.
There are two ways to set the reference voltage. The RS232 serial port allows
for setting an individual channel’s reference voltage with the $SET command.
The user can also use the latch channel values to take a snapshot of all current
outputs and use these as the reference values.
All channel reference values are with respect to the active Input (A or B). If Input
A and input B are both present, this allows for setting references on both inputs
to accommodate variation in amplitude between the two inputs.
Save Configuration
The save configuration screen allows the user to save the current settings for
alert threshold, input threshold, attenuation, input select, reference voltage and
any other settings that have been modified via the RS232 port.
To save the current settings, press the SELECT button twice.
The save configuration action is equivalent to the $SAVEFL command on the
serial port.

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Fault Status
The fault status screen allows a quick overview of any channel faults from the
front panel. The total fault count is listed, as well as a visual flashing indication of
any channels that are beyond the threshold values.
Press SELECT to advance to the system fault screen.
The system fault screen indicates any failures in the primary system or the
redundant backup system. All internal power supplies are monitored (24V, +8V, -
8V, 5V) on both the primary and backup systems. A failure on one of these
supplies will be indicated with a “PS FAIL” fail warning for either system. A
communication failure would be indicated by a “Com FAIL” indicator. Either of
these fault statuses will result in the change of the primary to the backup system.
The individual statuses of the internal power supplies are also available via the
RS232 serial port.
The presence of a valid DC input voltage is indicated on this screen, as well as a
valid AC power input. If either of these supplies are not present, a “FL” indication
will be shown next to the appropriate input.

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Power Switch
The rear panel power switch controls AC power input to the unit. If the optional
DC input is provided with 24V, or a valid DC supply, the unit will operate. If the
unit is powered with the DC option, the rear panel switch does not remove DC
power.
The AC and DC input option provides a redundant and automatic backup source
in the case of failure of either input.
Distribution Amplifier Cabling - Synchronizing NR2310D-O/G and
ND2310D
This installation procedure assures that the distribution amplifier in the source
and the external distribution amplifier have the same cable delay.
Procedure:
1. Install the NR2310D-O/G in a 19” rack. Be sure to secure the unit with
appropriate fasteners to the rack.
2. Install the ND2310D above or below the NR2310D and again secure with
appropriate fasteners. Be sure the cable can reach between the units.
3. There are two SMA or BNC cables (customer choice) installed on the back
of the NR2310D-O/G. One cable is attached to the #2 10 MHz port and
the other end is running to Input A. The other cable is attached to #1 of 10
MHz and is hanging loose. Note: The cable length for the 10 MHz to
Input A must be the same for both cables or the leading edge of the units
will not be synchronized. Also, these units are calibrated so the start of the
PPS and the 10 MHz Square Wave are synchronized using the cables
attached. Changing cable could cause this calibration to change.