Technical information

Installation
205
The S1 Switch Settings for the T1 Trunk Cable
Length (not loop length)
0 - 45.8 m (0 - 150 ft.)1 only closed (see figure below)
45.8 - 137.3 m (150 - 450 ft.) 2, 3, 4 closed
137.3 - 200.5 m (450 - 655 ft.) 5, 6, 7 closed
Figure 32: S1 Switch Showing 1 Closed
The S1 Switch Settings on the PRI Card
The S1 switch settings on the PRI Card shown in the following illustration
inform the T1 module of the location of the clock source. Switch setting
B allows the PRI Card to get clocking from the backplane, if the card is
installed in the main control cabinet. If the card is installed in a peripheral
cabinet the clocking comes from the FIM (switch setting A).
Figure 33: S1 Switch Settings on the PRI Card