ADC ICX-250 User Manual page 38

External DIP Switches
T1 Interface - T1 Clock
ICX-250 - Rear Panel
Switch numbers S1 through S5 are shown on the board within the unit.
FXS Loopback
FXS Loop Pairs
1
S5
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.
Issue 1, September 1998
© 1998, ADC Telecommunications, Inc.
( DIP switch - back )
12 13 24 Data 1
Alm.
S4 S3
ON
1 2 3 4 5 6 7
Note:
to internal clock. When external clock is restored, the
unit will switch back to external clock source.
Configuring the ICX-250
Data 1
T1 Line
Data 2 Data 2 T1
S2 S1
T1
DIP
LINE
Failure of external clock causes unit to switch
33
T1
24/48 VDC
Rx
+ – G
Tx
120 VAC–.6A 60Hz
11268-A
T1
ON DIP
1 2 3 4 5 6 7
INTERNAL
ADCP-62-023