ESE ES-185U, Operation And Maintenance Manual, Page: 10 / 25

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stabilization, the 10 MHz Lock LED lights solidly. The 10 MHz output is filtered to a sine-wave and
buffered by op-amp Z14. The microcontroller generates the 1 KHz signal, which is buffered by Z1.
NTP: When Option “NTP” is specified, a NTP port is supplied with the unit that allows the ES-185U to act as
a network time server. The settings of the ES-185U may be changed using the network interface as
well. The NTP output is provided on a 10/100 Base-T Ethernet connector. A recessed Reset
pushbutton is also provided. It is a multifunction control. Pressing the Reset button momentarily (one
second) allows the user to reinitialize the NTP output. The Reset button may also be used to change
the network parameters as described in section 5.4.
UL: When Option “UL” is specified, the unit’s power transformer is external to the unit, ie: a “wall wart” type
UL/CSA approved transformer is supplied. This option allows the ES-185U to be installed in facilities
requiring “UL” (or equivalent) approved equipment.
9.0 SPECIFICATIONS
9.1 General
GPS RECEIVER: Motorola 12-channel, M12+ Oncore Timing
GPS ANTENNA: Gain: 25 dB; Bandwidth: 2 MHz
Option ANT: Gain: 25 dB; Bandwidth: 25 MHz
1 PPS OUTPUTS: DB-9 connector, TTL outputs, positive edge true:
#1 - 20% duty output < 10
η
S accuracy, directly from receiver
#2 - 50% duty output < 1 mS accuracy, regenerated
ESE TC OUTPUT: BNC, drives 100 Readers, 4000' cable maximum
TC89 - drives non-”A” version Readers
TC90 - drives “Date” Readers and/or “A” version Readers
SMPTE TC OUTPUT: XLR, 600 ohm balanced or unbalanced
IRIG-B TC OUTPUT: BNC, AM or TTL
AM: 2-7 Vpp (mark amplitude), Mark to Space 3.3 to 1, 600
Ω
TTL:
≥
4.0 V high and
≤
0.6 V low, 5 Vpp
RS-232C OUTPUT: DB-9 connector, ASCII Date & Time, sent once per second
USB OUTPUT: USB 2.0 Compatible
USB/RS-232C FORMAT: ASCII @ 9600 Baud, 8 Data, No Parity, 1 Stop, binary format
Format “D”: <255>DMYHMSDMYHMx<254>
The first DMYHMS is Day, Month, Year, Hours, Minutes and Seconds in UTC
The second DMYHM is Day, Month, Year, Hours and Minutes offset to local time
(seconds are the same as UTC)
x is the number of satellites that the unit is locked to (0 – 12, 0 = no lock, 1 – 12 = lock).
Transmission is once per second.
VIDEO INPUT: BNC, RS-170 composite video / blackburst, 1 Vpp, 75 ohm
ACCURACY: 1 PPS @ < 10
η
S
ESE TC @ 17 mS
IRIG-B @ 1
µ
S
SMPTE @ 0 Frames with respect to Video Sync
Option NTP: NTP output @ 15 mS
DRIFT: 33 mS/Day
COIN CELL BATTERY: Nominal Voltage: 3V
Nominal Capacity: 255 mAh
Dimensions: 23.0 mm x 3.0 mm
POWER: 110-120 VAC, 60 Hz, 15 Watts maximum
(Option "DC" only) +11 to +35 VDC, 1 Amp maximum
MECHANICAL: Rackmount Enclosure 1 ¾” H x 19” W x 9 ½” D
OPTION K: 10 MHz sine wave, BNC, 4 Vpp into 50 ohms (adju/- 0.5V), 1 x 10
-8
accuracy
1 kHz Square wave, BNC, 5 Vpp CMOS/TTL, 1 x 10
-8
accuracy
1 PPS, 50% duty cycle, DB-9 (pin 5), 5 Vpp CMOS/TTL, < 2
µ
S of GPS when 10 MHz
lock LED is solid
OPTION NTP: Network Interface: RJ45 Ethernet 10Base-T or 100BaseTX (Auto-sensing)
Compatibility: Ethernet: Version 2.0/IEEE 802.3