ADLINK ACL-7120A/6 - Manual (Page 21)

Installation
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2.7 Clock Frequency Settings
The ACL-7120A board offers 3 frequency sources: 10kHz, 100kHz, and 1
MHz. These frequencies can be double, half or quartered by placing a jumper
on position " X2," "X1/2," or "X1/4," of JP1. The default setting is “X1.”
X2
X1
X1/ 2
X1/ 4
JP1
*
* : default setting
Figure 2.5