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XLi Time & Frequency System 23

XLi-man, Issue 8, 6/17/2008, Rev. H

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Making Additional Connections

Make the following optional connections to the standard input/output connectors on the XLi back panel:

• The ANTENNA connector to a GPS antenna cable. (Note: Use a 12-volt capable GPS antenna.)

• The NET network port (RJ-45) to an ethernet network using Cat 5 cable (supplied). This

connection is needed to manage the XLi remotely, or to use the optional NTP function.

• The SERIAL I/O connector to a PC using the supplied RS-232 null modem cable.

• J1, J2, and J3, if needed. See “F110 – J1 Input (Time Code, TIET)” on page 137

, “F111 – J2

Output (Rate, PPO)” on page 142, “F113 – J3 Input (Aux Ref, Freq Meas)” on page 146

Figure 5: Connectors: ANTENNA, SERIAL I/O, J1, J2, J3, NET, 1PPS, CODE, ALARM

Connecting the Power Supply

Warning: Ensure that a disconnect device, such as a switch, with the appropriate voltage/

current rating is provided when operating/installing the XLi.

Connect the Power Supply it to a power source. The green STATUS light indicates that the XLi is

receiving power.

Notes for optional DC power supplies:

• Use a 15 amp circuit breaker in series with the DC power source; avoid connecting directly to a

DC power source without the breaker.

• 14 gage wire is the minimum recommended for DC power source hookup.

• DC Power Supply Only to be used in a restricted access area.

• The screw torque range on the Power Terminal Block is 5 to 8 inch pounds.

• When connecting to a DC power source, first connect the positive power cable to “+” on the

power supply, then connect the negative power supply cable to “−”.

Upon receiving power, the XLi goes through its startup sequence; displaying “BOOTING”, “LOADING”,

and “STARTING”. After approximately 40 seconds, the XLi displays the clock status, and user interfaces

(front panel/command line) become available.

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Symmetricom XLi User Manual

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