5: Function Reference
F110 – J1 Input (Time Code, TIET)
Note: Time Interval - Event Time (TIET) is an optional feature. If purchased at the same time
as the XL-GPS, it comes enabled on the system. To purchase this option after you
have purchased the XL-GPS, contact Symmetricom Sales.
See “H: Sales and Cus-
tomer Assistance” on page 204.
F110 can configure the J1 input port on the main CPU card as a time code reference source
for the system clock, or it can configure J1 as the input for TIET operation.
Keypad
•
J1 Configuration
: (IRIG-A,
IRIG-B
, NASA 36, TIET, IRIG-B 1344). Set to match
the type of time code input.
•
J1 Time Reference
(Available when J1 Configuration is IRIG-A,
IRIG-B
, NASA 36,
not for TIET): (
Primary
, Standby) Identify the time code input as a primary reference
source. Standby disables and removes J1 Input as a valid reference source.
Selecting Primary automatically bumps another reference source with the same
setting (e.g.
F119 – GPS Receiver Configuration
) to Standby.
Note: Configuring F110 for TIET forces
J1 Time Reference
to Standby. When recon-
figuring the J1 as a time code reference source input, be sure to set J1 Time Ref-
erence to Primary.
•
Configure Code
: (
AM
, DC) Set to the time code input signal type: AM for amplitude
modulated, or DC level shift. For more information, see the time code definitions in
for more information See "E: Time Code Formats" on page 198. Selections are IRIG-
B 120 or 100.
•
Input Impedance
: Always use 50
W
coaxial cable and terminate it into a 50
W
load.
•
Input Polarity
: Positive, Negative
•
Propagation Delay
: (Range 0 to 99999
m
S in 1
m
S steps) (Factory setting:
1
m
S
)
Compensates for delay caused by cable length on the J1 input.
•
IRIG Mode
: (Sync Gen)
•
Error Bypass
: (Off, 1-10 Frames) (Factory setting:
3 frames
) Is used when the
IRIG input is intermittent or has a low signal to noise ratio (SNR). This allows the time
code input to ‘flywheel’ for the specified number of invalid time code frames before
generating a F73 alarm under F73.
Off
means the F73 IRIG input alarm will alarm on
the first invalid time code frame.
1-10
means the F73 IRIG input alarm will alarm after
it detects 1-10
consecutive
invalid time code frames.
When TIET is selected for J1 Input Configuration, F110 presents the following series of
choices:
•
Input Impedance
: 50
W / 100kW
.
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098-00116-000 Rev. A
Summary of Contents for XL-GPS
Page 1: ...XL GPS Time Frequency Receiver User Guide CD Part Number 098 00116 000 Rev A 5 May 2010 ...
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Page 214: ...IRIG IRIG Standard Format A 098 00116 000 Rev A Page 200 of 221 ...
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Page 216: ...F World Map of Time Zones 098 00116 000 Rev A Page 202 of 221 ...
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Page 220: ...I Certificate of Volatility See the following document 098 00116 000 Rev A Page 206 of 221 ...
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Page 225: ...J Declaration of Conformity See the following document 098 00116 000 Rev A Page 208 of 221 ...