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MANUAL P/N 900000178 REV B
1.2.8.9 Optical Crosslink OSM
The Optical Crosslink Module is a unique feature of the
M212. When installed, it allows a second M212 to be
synchronized as a slave chassis. If both chassis have
a primary reference installed (e.g. GPS) then the two
MCM’s operate as peers. Peering provides additional
redundancy, as well as providing additional references
to detect failures.
When a duplex cable is provided, the optical link
provides seamless and automatic propagation delay
compensation. A security mode allows the optical link
to be operated in a single direction form Master to
Slave over a single fiber.
Specifications :
Connector Type LC
No of Outputs 2 bi-directional per OSM
Synchronization Accuracy
Phase Measure Accuracy 1ns
End to End Accuracy
<5ns synchronization
Optical
Wavelength Single Mode 1300nm
Safety Class 1 CDRH/IEC 825
Range
2
2000m 9/125um cable
1.2.8.10 1 PPS Distribution Module
The 1PPS Distribution Module provides 4 1PPS
outputs. The OSM buffers and distributes a 1PPS
signal that is generated directly on the MCM. The
stability and accuracy will be those of the selected
MCM. The propagation delay compensation feature is
not available on this OSM.
Specifications
:
Rising Edge On Time
Rise Time <15ns
Fall time <60ns
Pulse Width 20 µs ±5% default.
Amplitude 10V ±10% into 50
Ω
Source impedance link selectable 50
Ω
/lowZ
1.2.8.11 Octal Distribution Module
The Octal Distribution Module provides up to 8 RS232
or RS422 output ports that can be used to broadcast a
time of day message. All output formats are identical,
and selected at the MCM. One channel can be
dedicated as an input channel to provide the MCM with
a NMEA $GGA message as an input timing reference.
Selection of RS232/422 is available on a per channel
using user-installed push on links
Specifications
No of channels 8
Connector Type 62pin D receptacle
Electrical
1.2.8.12 Have Quick Distribution Module
The Have Quick Distribution Module provides 4 Have
Quick time code outputs. The OSM buffers and
distributes a Have Quick signal that is generated
directly on the MCM. The stability and accuracy will be
those of the selected MCM. The propagation delay
compensation feature is not available on this OSM.
Specifications :
Format ICD-GPS-060A
Signal Format Per ICD-GPS-060A
(Consult factory)
STANAG 4430 HQ2A
Rising Edge On Time
Rise Time <100ns
1PPS coherence < 100ns of rising edge
Amplitude Logic 1 2.4Vmin
Logic 0 0.25V max
1.2.8.13 Modulated Time Code
Distribution Module
The Modulated Time Code Distribution Module provides
4 AC modulated time code outputs. The OSM buffers
and distributes the same time code signal that is
generated directly on the MCM. The stability and
accuracy will be those of the selected MCM. The
propagation delay compensation feature is not available
on this OSM.
Specifications
:
Time Code Output
Signal Format B122, B124 2137
(Consult factory for other
formats)
Control Functions B124 per IEEE1344
Rate 1kHz modulated
Modulation ratio 10:3 ±10%
Amplitude 5V
p-p
±20%
Load impedance
>50ohm
RS232
RS422/485
Channel selection push on link
Input channel format NMEA $GGA
2
Consult Factory for longer range or multimode