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External DIP Switches Configuring the ICX-250 33
Issue 1, September 1998 ADCP-62-023
© 1998, ADC Telecommunications, Inc.
T1 Interface - T1 Clock
(
DIP switch - back
)
ICX-250 - Rear Panel
Switch numbers S1 through S5 are shown on the board within the unit.
Description:
S1 position 4 is used to select the T1 clock source.
Factory Setting:
LINE
Line:
Clock for the T1 interface will be recovered from the line (receive signal).
Internal:
Clock for the T1 interface will be taken from an on-board 1.544 MHz clock meeting the
Stratum 4 requirements.
Note:
Failure of external clock causes unit to switch
to internal clock. When external clock is restored, the
unit will switch back to external clock source.
120 VAC–.6A 60Hz
24/48 VDC
+ – G
T1
Rx
Tx
T1 Line
T1Data 2Data 2Data 11121324
ON DIP
1234567
Alm.
Data 1
FXS Loopback
FXS Loop Pairs
S5 S4 S3 S2 S1
11268-A
T1
LINE
ON DIP
1234567
T1
INTERNAL