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XLi IEEE 1588 Clock 99

997-01510-03, Rev. C, 12/12/2006

SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S

where:

For example, enter the following string:

F108<CR>

The XLi responds (example):

F108 OSCILLATOR CONFIG TCVCXO<CR><LF>

F110 – J1 Input (TIET)

Note: The Time Interval - Event Time (TIET) option is included as a standard feature on the XLi IEEE

1588 clock.

Note: Using time code as a reference source is not supported for the XLi IEEE 1588 Clock.

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) 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, Secondary, Standby) Identify the time code input as a primary or secondary reference

source. The function, “

F74 – Clock Source Control” on page 77, uses this designation to for

reference source switching. Standby disables and removes J1 Input as a valid reference source.

Selecting Primary or Secondary 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 reconfiguring the J1 as a

time code reference source input, be sure to set J1 Time Reference to Secondary or Primary.

• Configure Code: (AM, DC) Set to the time code input signal type: AM for amplitude modulated,

or DC level shift. See the time code definitions in “

E: Time Code Formats” on page 189 for more

information.

• Input Impedance: (For DC: 100 kΩ or 50Ω. For AM: 100 kΩ only.) For DC code, set the

appropriate impedance level for the length of the input cable. Short runs (<200 ft.) get 100 kΩ,

and long runs (>200) get 50Ω.

F = ASCII character F

108 = Function number

<S> = ASCII space character one or more

<CR> = Carriage Return, equivalent to pressing the Enter key on a keyboard

<OSC> = Oscillator type: TCVCXO, OCXO, HIGH (High Stability OCXO), or RUBIDIUM

Symmetricom XLi IEEE 1588 User Manual

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