B.4 Holdover Oscillator (1201B/C Only)
121
B.4
Holdover Oscillator (1201B/C Only)
C01: Holdover OCXO, 1 millisecond per day
B.5
One Fiber Optic Output
One, optional, fiber optic output is available with Type ST connector and 820 nm transmitter, compatible
with multimode fiber. This output is configurable to any of the standard
digital
(CMOS) signal outputs
available from the clock and provides an optical output power of -15 dBm minimum (-12 dBm typical) into
62.5/125
µ
m fiber. Signals include unmodulated IRIG-B, 1 PPS and Programmable Pulse.
B.6
Four Configurable Outputs
B.6.1
General Description
This option adds four rear-panel outputs, which may be configured to any of the available signals in the
clock. Note that there are many more jumper settings on the option board than the the clock is capable of
providing. The configuration of the four outputs can be changed at any time via internal jumper settings.
B.6.2
Specifications
General
Output Connectors:
BNC-type RF connectors (4)
Analog Outputs
Output Type:
LF353, with 560 Ω source resistance
Available Outputs:
modulated IRIG-B (B120 and B123)
IRIG-B, Modulated:
IRIG format B time code, modulated onto 1 kHz 3.8 Vpp sine wave
carrier; 2.8 Vpp into 50
W
Digital Outputs
Output Type:
High-speed CMOS (74HC126), 0 V to 5 V, with 47
W
series resistor
Available Outputs:
unmodulated IRIG-B, 1 PPS, Programmable Pulse, Out-of-Lock
IRIG-B:
IRIG format B time code (unmodulated)
Cover Removal
To change the configuration of this option, the top cover of the instrument must be removed. Turn off the
instrument, and disconnect the power cord. Using a T25 Torx driver, remove the eight screws holding the
cover (and rack-mount ears, if used) in place, and lift the cover off.
B.6.3
General Information
Output selection incorporates is extremely flexible using jumpers on the option board. Each of the four
rear-panel BNC-type I/O connectors found on the rear panel can be configured to perform any of the
output signals available from the specific clock model. Figure B.3 shows the locations of board jumpers, and
Table B.1 indicates the available signals and their jumper positions.
Signal Selection
To choose a specific signal to be applied to a specific output connector requires setting three jumpers: (1)
output function, or the type of signal, like IRIG-B, (2) output mode, whether it’s an analog or digital signal,
and (3) the clock model in which the option is installed.
Содержание 1200B
Страница 4: ...iv ...
Страница 135: ...A 3 Physical Dimensions 117 Figure A 2 Suggested Mounting of the GNSS Surge Arrester ...
Страница 143: ...B 7 Four Fiber Optic Outputs 125 Figure B 4 Jumper Locations ...
Страница 145: ...B 8 8 Channel High Drive IRIG B Amplifier 127 Figure B 5 8 High Drive Outputs Jumper Locations ...
Страница 161: ...B 10 Four Additional Outputs and Dry Contacts 25 50 Vdc 143 Figure B 7 Option Connector Signal Locations ...
Страница 212: ...Appendix E Statement of Compliance The following page is a statement of compliance that includes Model 1201B and 1201C ...