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 page204.
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 50W coaxial cable and terminate it into a 50W load.
• Input Polarity: Positive, Negative
• Propagation Delay: (Range 0 to 99999 mS in 1 mS steps) (Factory setting: 1 mS)
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: 50W / 100kW.
Page 128 of 221 .................................098-00116-000 Rev. A
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