Installation; Operation - Symmetricom XLi User Manual

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Output Signal Frequency Selection:
Output Output 1
1
Jumper Block JP7
10 Mb/s
5 Mb/s
1 Mb/s
2048 Kb/s
8 Kb/s
64 Kb/s
* Composite Clock is a factory configured option available on Output 1.

Installation

Disconnect power from the XLi. Remove a blank panel from the rear of the XLi chassis, by unscrewing
the two screws securing it. Insert the edges of the E1 card into the grooves of the guide rails in the empty
option slot. Firmly push the E1 card into the option slot so the connector on the back of the card engages
the backplane connector completely and the front of the card is flush with the adjacent surfaces on the
back of the XLi. Secure the E1 card using the previously removed screws.

Operation

No special operation procedures are required. However, configuration of the Major and Minor faults
using F73 affects the operation of this option when AIS and Output signal control is enabled via DIP
switch S1, position 8.
Note:
Note: Alarm Relay closures are silk-screened on the panel above the three wire wrap pins. These
silk-screen legends indicate the non-energized state of the relay closures. During normal opera-
tion, the relays are energized so that a power failure would indicate a fault condition. Therefore
the Alarm state is the non-energized state which is described by the silk-screened legends.
The XLi provides accurate time and frequency whenever the clock is locked to a reference source. When
the clock is unlocked, the XLi flywheels on its internal oscillator or, if available and enabled, uses an
external frequency reference on the J3 Aux Ref input. The accuracy and stability of this card's outputs
are characteristic of the internal oscillator or Aux Ref to which they are phase locked. When the XLi is
equipped with an optional OCXO or Rubidium oscillator, this card is capable of providing
Telecommunications Stratum I, Primary Reference Source performance.
Jumper blocks, JP9, JP8, JP7, JP6, JP5, and JP4 allow selection of a desired output from OUT1, OUT2,
OUT3, and OUT4, respectively. When operation is balanced, the output pairs are available at wire wrap
connector P3.
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Output 2
JP6
Pos.1 Pos.1
Pos.2 Pos.2
Pos.3 Pos.3
Pos.4 Pos.4
Pos.5 Pos.5
Pos.6 Pos.6
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Output 3 Output 4
JP5 JP4
Pos.1 Pos.1
Pos.2 Pos.2
Pos.3 Pos.3
Pos.4 Pos.4
Pos.5 Pos.5
Pos.6 Pos.6
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XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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