363-206-305 Detailed Level Procedure: 
DLP-507
Issue 3, June 2000 Page 1 of 2
DDM-2000 F
IBER
R
EACH
 W
IDEBAND
 S
HELF
Install T1EXT Circuit Packs
1.
!
CAUTION:
In addition to primary lightning protection, an external Lightning and 
Surge Secondary Protection Assembly (ED-8C783-30 or equivalent) is 
required for 
T1EXT 
circuits used in outside plant applications.
Take care to avoid damaging the LEDs that protrude through the opening in 
the faceplate of the 
T1EXT
 circuit pack. 
2.
NOTE:
DS1 line coding may be set using either the option switches or the 
set-t1 command. It is recommended that a policy be established to set 
line coding using either the switches or the command. If DS1 line code 
(lc) parameters are set using the set-t1 command, a software override 
will be active and the circuit pack switch settings will have no effect. The 
software override will remain active until the set-t1 command is 
executed again and the noOverride option is selected. The rtrv-t1 
command may be used to check line code settings.
Refer toTable A and Figure 1 and set the line code option switches, if required.
Note:
 Switch 1, section 3 (
S1-3
), section 4 (
S1-4
), section 5 (
S1-5
) must be set to 
OFF
.
Figure 1. T1EXT Option Settings
Table A – T1EXT Line Code Settings (Note)
Line Code 
Format
Switch S1 Settings 
S1-1 
(Port 1)
S1-2 
(Port 2)
S1-3 
(Unused)
S1-4 
(Unused)
S1-5 
(Unused) 
B8ZS OFF OFF
OFF OFF OFF 
AMI ON ON
Connector
Edge
5
Component Side
S1
OFF
ON
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