Brandywine ENTA-2 User manual

1
MANUAL P/N 900000108 REV D
User Guide
Enhanced Network Time Appliance
Model ENTA-2
P/N 023000004
Revision D
August 2011
Brandywine Communications
1153 Warner Ave.
Tustin, CA 92780
[phone]
[phone]
http://www.brandywinecomm.com

2
MANUAL P/N 900000108 REV D
Revision History
REVISION DATE COMMENTS
1 JUN 2009 Initial Release
2 JUL 2009 Updated Screen Shots/ Text
A JUL 2009 QA updates
B AUG 2009 Updated IRIG-B input and 10MHz output connector numbers in table 1
C AUG 2009 Added UL requirements, Updated Telnet information and FPGA install
D AUG 2011 Changed Title Page/ Updated FPGA Upload

3
MANUAL P/N 900000108 REV D
Safety Warnings
WARNING: This unit contains lethal AC voltages. Disconnect the unit
from the AC supply before removing the cover.
WARNING:
The lightning flash with an arrowhead inside of an equilateral triangle is intended to alert
the user to the presence of un-insulated “dangerous voltage” within the product’s
enclosure. The “dangerous voltage” may be of sufficient magnitude to constitute a risk of
electrical shock to people.
CAUTION:
The exclamation point inside of an equilateral triangle is intended to alert the user to the
presence of important operation and maintenance instructions in the user guide.
WARNING:
Rack Mount Instructions -
The following instructions shall be followed with the installation of the unit:
Elevated Operating Ambient –
If installed in a closed or multi-unit rack assembly, the operating ambient temperature of
the rack environment may be greater than room ambient. Therefore, consideration should
be given to installing the equipment in an environment compatible with the maximum
ambient temperature (Tma) specified by the manufacturer.

4
MANUAL P/N 900000108 REV D
Reduced Air Flow –
Installation of the equipment in a rack should be such that the amount of air flow required
for safe operation of the equipment is not compromised.
Mechanical Loading –
Mounting of the equipment in the rack should be such that a hazardous condition is not
achieved due to uneven mechanical loading.
Circuit Overloading –
Consideration should be given to the connection of the equipment to the supply circuit
and the effect that overloading of the circuits might have on over-current protection
and supply wiring.
Reliable Earthing –
Reliable earthing of rack-mounted equipment should be maintained. Particular attention
should be given to supply connections other than direct connections to the J1 Connector
WARNING:
J1 output is not a Limited Power Source (LPS). All devices connected to
this connector must be listed by a National Recognized Testing Laboratory
(NRTL) and be provided with a suitable fire enclosure.

5
MANUAL P/N 900000108 REV D
Table of Contents
1 Specifications .......................................................................................................................... 7
1.1 GPS Receiver .................................................................................................................. 7
1.1.1 Receiver Type .......................................................................................................... 7
1.2 Internal Oscillator ............................................................................................................. 7
1.2.1 Oscillator Type ......................................................................................................... 7
1.3 Inputs ............................................................................................................................... 7
1.3.1 Antenna.................................................................................................................... 7
1.3.2 1 PPS....................................................................................................................... 7
1.3.3 IRIG-B ...................................................................................................................... 7
1.4 Outputs ............................................................................................................................ 8
1.4.1 Reference Frequency Output ................................................................................... 8
1.4.2 Time Code - IRIG B + IRIG E................................................................................ 8
1.4.3 Serial Time Code RS 232/ RS 422 (Not Used) ........................................................ 8
1.4.4 Pulse Rates.............................................................................................................. 8
1.5 Network Ports................................................................................................................... 8
1.6 Status Indicators .............................................................................................................. 8
1.7 Time Display .................................................................................................................... 8
1.8 Environmental .................................................................................................................. 8
1.9 Mechanical....................................................................................................................... 9
1.10 Rear Panel Connections .................................................................................................10
2 General Description................................................................................................................11
3 Unpacking and Installation .....................................................................................................12
3.1 Unpacking .......................................................................................................................12
3.2 Installation.......................................................................................................................12
3.3 Connections ....................................................................................................................12
3.3.1 Power......................................................................................................................12
3.3.2 Antenna...................................................................................................................12
3.3.3 Network Connection................................................................................................14
3.3.4 Other Connections ..................................................................................................14
4 Getting Started .......................................................................................................................15
4.1 Powering Up the ENTA ...................................................................................................15
4.2 Setting the Network Address...........................................................................................15
4.2.1 IPSetup.exe.............................................................................................................16
4.2.2 Web Browser...........................................................................................................17
4.3 Latest Version of Java Software......................................................................................18
5 Configuration ..........................................................................................................................19
5.1 Web Browser Configuration ............................................................................................19
5.1.1 System ....................................................................................................................19
5.1.2 Setup.......................................................................................................................20
5.1.3 Password ................................................................................................................24
5.1.4 Reference................................................................................................................25
5.1.5 Advanced ................................................................................................................32
5.1.6 Help.........................................................................................................................40
5.2 TCP 2500 Socket Interface .............................................................................................41

6
MANUAL P/N 900000108 REV D
5.2.1 Opening TCP 2500 Socket Interface.......................................................................41
5.2.2 TCP 2500 Socket Interface Command List .............................................................41
5.3 TELNET and Console Port Configurations......................................................................42
5.3.1 Opening TELNET Session ......................................................................................42
6 Uploading Firmware ...............................................................................................................44
7 Uploading FPGA ....................................................................................................................46
7.1 FPGA Update..................................................................................................................46
7.2 FPGA Upload..................................................................................................................49
8 Maintenance and Troubleshooting .........................................................................................51
9 Drawings ................................................................................................................................52

7
MANUAL P/N 900000108 REV D
1 Specifications
1.1 GPS Receiver
1.1.1 Receiver Type
A
rchitecture 12 parallel channels
•Dynamics
Velocity 1000 knots everywhere
> 1000 knots at altitudes < 60000 ft.
A
cceleration 4 g
Jerk 5 m/s3
•Acquisition Time
Hot (with the current almanac, position, time, and
ephemeris)
< 20 s typical
Warm (with the current almanac, position, and time)
< 50 s typical
Cold < 300 s typical
•Positioning Accuracy
Fix mode < 25 m SEP
Site Survey mode
< 5 m SEP typical after position average
•Datum
WGS-84
1.2 Internal Oscillator
1.2.1 Oscillator Type
GPS disciplined High Precision OCXO
A
ging < 5x10-10per month when free running
Temperature coefficient
± 2x10-9 ;-20°C to +50°C
Design lifetime
> 20 years
1.3 Inputs
1.3.1 Antenna
Type
A
ctive patch antenna
Connector BNC
Pre-amp power 5 VDC @ 80 mA via center conductor
1.3.2 1 PPS
Signal used 1 PPS
Connector BNC
Level 2.0 V min & 5.0 V max (TTL compatible)
Impedance 50
Ω
Minimum pulse width
5 microseconds
On time Rising edge
1.3.3 IRIG-B
Signal used
IRIG B122 and B123 per IRIG 215.98
2 – 5 Vpp
Connector BNC

8
MANUAL P/N 900000108 REV D
1.4 Outputs
1.4.1 Reference Frequency Output
Frequency 10 MHz
Connector BNC
Output level
TTL INTO 50
Ω
1.4.2 Time Code - IRIG B + IRIG E
Code format IEEE 1344 Ext. IRIG B modulated
DC Level Shift
IRIG E DC Level Shift
Modulation ratio
3:1 nominal
A
mplitude 3 Vpp into 600 ohm (modulated)
TTL into 50 ohm (DC Level Shift)
DC offset voltage < 0.05 V
Connector BNC
1.4.3 Serial Time Code RS 232/ RS 422 (Not Used)
1.4.4 Pulse Rates
•1 PPS
A
mplitude 0-5 V logic compatible
VOH > 2.4 V & VOL < 0.55 V
Output impedance 50 ohm
Connector BNC
Pulse width 10 microseconds
On time Rising edge
Phase relationship to 10 MHz When synchronized there are always 10710
MHz cycles between each 1 PPS rising edge
1.5 Network Ports
Number of ports
2
Port type Ethernet 10/100BaseT
Protocols supported NTP (RFC 1305), Telnet (RFC 854)
Connector RJ-45
1.6 Status Indicators
•LEDS
Power (Green)
Indicates power is available
Fault (Red) Indicates monitored parameter is out of range
1.7 Time Display
Minutes/Hours/Seconds
–
UTC or Local time
1.8 Environmental
•Temperature
Unit Operating -20°C to +50°C
A
ntenna Operating -40 to +85°C
A
ll units Storage -55 to +85°C
•Humidity
Unit Up to 95% RH non-condensing
A
ntenna Not limited
•Altitude
Unit Operating 20, 000 ft
Transport 40, 000 ft
•Power
Range 85-264 VAC 50/60 Hz
Power 40W Nom.

9
MANUAL P/N 900000108 REV D
Connector IEC 320 with integrated switch and fuse
Fuse 1A 5x20mm slo-blo
•EMC
FCC port 15
EN55022
EN55024
1.9 Mechanical
Size (unit) 17” x 1.72” x 9” excluding the connectors and
handles. Front panel width 19”.
Weight 5 lbs. nominal

MANUAL P/N 900000108 REV D
10
1.10 Rear Panel Connections
CONNECTOR REFERENCE CONNECTOR
TYPE CONNECTOR PIN SIGNAL
J1 TIMER 1 - 12 REMOVABLE
TERMINAL BLOCK
NOT USED
A
NTENNA, J3 BNC CENTER GPS SIGNAL INPUT
CENTER +5 V LNA SUPPLY
SHIELD GROUND
CONSOLE PORT, J4 DB-9 FEMALE 1 -
2 TRANSMIT DATA
3 RECEIVE DATA
4 -
5 GROUND
6 -
7 -
8 -
9 -
FUNCTION SWITCH SWITCH
A
DJUSTS DISPLAY
TIME CODE/STATUS DB-9 MALE
QUAD SERIAL PORTS
PORT 1, RS422, J5 DB-9 MALE NOT USED
PORT 2, RS422, J6 DB-9 MALE NOT USED
PORT 3, RS232, J7 DB-9 MALE NOT USED
PORT 4, RS232, J8 DB-9 MALE NOT USED
IRIG-B IN, J10 BNC CENTER IRIG-B
SHIELD GROUND
10MHz OUT, J9 BNC CENTER 10 MHz
SHIELD GROUND
1 PPS IN, J11 BNC CENTER 1 PPS
SHIELD GROUND
1 PPS OUT, J12 BNC CENTER 1 PPS
SHIELD GROUND
1 IRIG E DC LEVEL SHIFT, J13 BNC CENTER IRIG E TIME CODE
SHIELD GROUND
1 IRIG E OUT , J14 BNC CENTER IRIG E TIME CODE
SHIELD GROUND
IRIG B DC LEVEL SHIFT, J15 BNC CENTER IRIG B TIME CODE
SHIELD GROUND
1 IRIG B OUT, J16 BNC CENTER IRIG B TIME CODE
SHIELD GROUND
ETHERNET, J2 RJ-45 1 TX+
2 TX-
3 RX+
4 -
5 -
6 RX-
7 -
8 -
ETHERNET, J17 RJ-45 1 TX+
2 TX-
3 RX+
4 -
5 -
6 RX-
7 -
8 -
Table 1 Connector Pinouts

MANUAL P/N 900000108 REV D
11
2 General Description
GPS
Micro
processor
IRIG
Generator
IRIG
Reader
OCXO DDS
DIV
MOD
MOD
10MHz
1PPS
IRIG-B
IRIG-B DC
IRIG-E
IRIG-E DC
MAC/
PHY 10/100
10/100
ANTENNA
IRIG-B
1 PPS
Figure 1 ENTA Simplified Block Diagram

MANUAL P/N 900000108 REV D
12
3Unpacking and Installation
3.1 Unpacking
Carefully remove the ENTA from the shipping carton. The following items are included in the shipment:
•1 ENTA
•1 power cord
•1 GPS antenna
•1 GPS antenna cable
•1 user guide
3.2 Installation
Install the ENTA in its mounting rack location and secure with four rack mounting screws
3.3 Connections
3.3.1 Power
Insert the provided power cord into the rear of the power entry module and connect the power cord to
an AC power outlet.
3.3.2 Antenna
Connect the GPS antenna to the Antenna connector (J3) on the rear panel of the ENTA. The GPS
antenna must be placed in a suitable location with a clear view of the sky. In most cases, the GPS
signals do NOT penetrate buildings. Use the provided antenna cable to connect the GPS antenna to
the ENTA. If a longer cable is required, a low loss cable must be used so that the total signal
attenuation at 1575 MHz is < 20 dB. Contact Brandywine Communications for more details on suitable
cables.

MANUAL P/N 900000108 REV D
13
Location
Several factors must be considered when installing the GPS antenna. In most cases, the antenna is
mounted externally (outdoor) and is exposed to the elements. A good quality coaxial cable of 50 ohm
impedance is required to connect the GPS antenna to the ENTA. The cable provides two functions,
which are to conduct the GPS RF signals (1575.42 MHz) that are received from the GPS antenna to
the ENTA and to conduct the DC bias voltage (5 VDC) provided by the ENTA to the LNA (low noise
amplifier) contained inside of the GPS antenna. The antenna should be mounted securely, have a
clear view of the sky, and have the top of the antenna pointing upward. For some installations, it may
not be possible to mount the antenna such that the antenna has a clear (360 degree) view of the sky.
For these cases, pick the location with the best view of the sky.
Exposure to High RF Fields
Some antenna installations may occur in locations where a variety of high power transmitters and
antennas are located. The GPS antenna should not be directly exposed to or bombarded with high
level RF energy. In such cases, it is better to place the antenna either above, below, or to the side of
high power RF transmission antennas.
Lightning Protection
The ENTA does not provide any inherent protection against lightning strikes. In general, lightning
protection (when desired or needed) is provided by an externally mounted protection device designed
to shunt the high voltage transient to a well established earth ground. Lightning arresting devices
designed for use in GPS antenna systems are available at Brandywine Communications (P/N
001000914).
Antenna Cable Factors
Other factors affecting the antenna mounting location deal with the cable length required to provide
connection between the GPS antenna and ENTA.

MANUAL P/N 900000108 REV D
14
RF Loss
The most important cause of signal loss is the RF signal attenuation experienced in the cable. The
amount of attenuation is related to the type (quality) of coaxial cable and cable length. The antenna
provides about 30 dB of gain to the received GPS signal. The purpose of this gain is to offset the loss
that is experienced in the cable between the GPS antenna and ENTA. It is recommended that the
overall antenna system gain (antenna gain - cable loss) be between 10 to 33 dB. Thus, using an
antenna with 30 dB of gain allows about 20 dB of cable loss.
The ENTA is shipped with 100’ of high quality antenna cable, which has a loss of approximately 13 dB.
Refer to Table 2 for additional cable configurations. For distances beyond 330’ an in-line amplifier is
required.
PART NUMBER CABLE LENGTH CABLE TYPE
002-0037 100 ft RG 58 (supplied)
002-0039 330 ft RG 8
002-0040 150 ft RG 8
051000001 In-line amplifier 20 dB TNC/TNC connectors
Table 2 Antenna Cables
3.3.3 Network Connection
Connect one end of the network cable to the RJ-45 10/100 BaseT Network port (J2/J17) and connect
the other end of the network cable to your network. The ENTA configuration process is described in
Section 4 and Section 5 .
3.3.4 Other Connections
Connect the output signals as required. For additional help connecting the output signals please refer
to Section 1.10.

MANUAL P/N 900000108 REV D
15
4Getting Started
4.1 Powering Up the ENTA
Once all connections to the ENTA have been made, apply power to the unit by setting the On/Off
switch to the on position. The On/Off switch is located on the rear panel power entry module.
The POWER LED on the front panel should be illuminated green within 2 seconds. The POWER LED
indicates that the ENTA has power.
Once the GPS has acquired satellites, time should be displayed on the front panel in the format:
HH:MM:SS.
4.2 Setting the Network Address
The ENTA is shipped with a label that indicates the IP address stored in the unit. The default settings
are:
•IP Address: 192.168.1.240
•Subnet Mask: 255.255.255.0
•Gateway: 192.168.1.1
To set the network address, the user may use either IPSetup.exe or a web browser. The two
processes are described below.

MANUAL P/N 900000108 REV D
16
4.2.1 IPSetup.exe
To set up the network address using the IP Setup program, follow the steps given below. Please note
that IPSetup uses a local broadcast on UDP port 20034.
1. Download the IP Setup program from the NetBurner website located at
http://www.netburner.com/support/public_downloads.html .
2. Double click on the IPSetup.exe icon and Figure 2 will be displayed.
Figure 2 NetBurner IPSetup Screen
3. Verify that the “Select a Unit” displays the current MAC and IP address of the ENTA unit
connected to the network.
4. Click on the ENTA unit that needs to be configured. Please note that the ENTA unit is
identified by MOD5272.
5. Enter the NDK Settings (IP, Network Mask, GateWay, and DNS).
6. To transfer the NDK Settings to the selected ENTA unit, click the button.
7. Wait 15 seconds for the NDK Settings to be loaded into the ENTA unit and for the ENTA unit
to restart.
8. Verify that the ENTA unit has the correct NDK Settings and is connected to the network by
clicking the Search Again button.
9. To exit the IP Setup program, click the Close button.
10. Open a web browser, type the IP Address of the ENTA unit in the Address bar, and press
<Enter>. For example, type 192.168.1.240 or http://192.168.1.240 and press <Enter>.
11. Figure 3 will be displayed.
12. Configure the ENTA unit. For more information on ENTA configuration, refer to the
Configuration section of the user guide.
IMPORTANT INFORMATION:
If the new NDK Settings make the ENTA unit inaccessible from the setup computer, the IP
Setup program won’t be able to locate the ENTA unit on the network.

MANUAL P/N 900000108 REV D
17
4.2.2 Web Browser
To set up the network address using the web browser, follow the steps given below.
1. Connect one end of an Ethernet cable to the ENTA Network Port.
2. Connect the other end of the Ethernet cable to your network.
3. Open a web browser, type the IP Address of the ENTA unit in the Address bar, and press
<Enter>. For example, type 192.168.1.240 or http://192.168.1.240 and press <Enter>.
4. Figure 3 will be displayed.
5. Configure the ENTA unit. For more information on ENTA configuration, refer to the
Configuration section of the user guide.
Figure 3 ENTA System Screen

MANUAL P/N 900000108 REV D
18
4.3 Latest Version of Java Software
To properly control and monitor the ENTA via a web browser based interface, Java software must be
installed on your computer. To obtain the Java software, follow the steps given below.
1. Go to http://www.sun.com/ .
2. Click on the Downloads link.
3. Click on the Java Download link.
4. Download Java.
5. Complete the installation process.

MANUAL P/N 900000108 REV D
19
5Configuration
The ENTA configuration may be completed in one of three ways.
•Via the web browser (recommended)
•Via a TELNET session
•Via the console port
5.1 Web Browser Configuration
5.1.1 System
The System tab consists of two sections, the System Status and Reference Status. This tab allows the
user to view the state, status, and reference of the ENTA system.
Figure 4 ENTA System Screen

MANUAL P/N 900000108 REV D
20
5.1.1.1 System Status
The System Status section consists of seven fields, the Version, Time, State, Locked, TFOM,
Alarm/Fault and Alarm/Fault LED. The Version refers to the version number of the ENTA. The Time
refers to the current UTC time. The State refers to the state of the system. If the system has locked to
the reference and the time is valid, Locked is ‘TRUE’. Otherwise, Locked is ‘FALSE’. If an alarm or
fault exists in the system, Alarm/Fault is ‘TRUE’. Otherwise, Alarm/Fault is ‘FALSE’. If the system’s
fault is latched, Alarm/Fault LED is ‘TRUE’. Otherwise, Alarm/Fault LED is ‘FALSE’.
The three system states are described in Table 3.
STATE DESCRIPTION
WARMUP The power up warm-up period.
READY The system is ready.
ACQUIRE The system is acquiring its reference.
LOCKED The system is locked to its reference.
HOLDOVER The system is in holdover.
Table 3 System States
5.1.1.2 Reference Status
The Reference Status section consists of two fields, the Reference Type and Locked. The Reference
Type refers to the reference the system is acquiring time from. If the reference is locked and provided
to the disciplining engine, Locked is ‘TRUE’. Otherwise, Locked is ‘FALSE’.
5.1.2 Setup
The Setup tab consists of four sections, the System, Ethernet 1, Ethernet 2 and Front Panel Display.
This tab allows the user to modify setup information for the ENTA. To save all modifications made to
the Setup screen, click the Submit button. This saves all modifications to all changes made to all
system parameters and settings. All values changed are written to non-volatile memory.
To undo all modifications made to the Setup screen, click the Reset button. This loads the system
defaults.