61180009L1-5D Issue 4, May 2006 5
* Denotes factory default settings
Note: SW1-1 through SW2-4 set up both T1s identically.
Table 3. Dual LIU Switch Settings
Switch Function Description
SW1 DSX-1 Line Build Out
and DS1 Attenuation
Selects the Line Build Out in feet; Attenuation in Decibels (dB)
Distance SW1-1 SW1-2 SW1-3
0-133 (Feet)/0 dB* OFF OFF OFF
133-266 OFF OFF ON
266-399 OFF ON OFF
399-533 OFF ON ON
533-655 ON OFF OFF
–7.5 dB ON OFF ON
–15 dB ON ON OFF
–22.5 dB ON ON ON
SW2-1
OFF
ON
Line Code Format
AMI
B8ZS*
Enables Bipolar Eight Zero Substitution (B8ZS), which allows for Clear Channel
operation for the T1 carrier system, or Alternate Mark Inversion (AMI). This
option must be configured identically with all other T1 network equipment on this
circuit.
SW2-2
OFF
ON
Framing Format
SF
ESF*
Enables either Extended Superframe Format (ESF) or Superframe Format (SF).
This option must be configured identically with all other T1 network equipment on
this circuit.
SW2-3
SW2-4
Timing Mode Determines a clock source for the Total Access 1500 channel bank.
Function SW2-3 SW2-4
Local clock – provided by local LIU OFF OFF
Loop A clock – uses recovered clock from T1 bit
stream*
OFF ON
External clock input ON OFF
SW2-5
SW2-6
SW2-7
Terminal Mode Select the appropriate Terminal Type and counting mode for the Total Access 1500
system.
Terminal Mode Counting SW2-5 SW2-6 SW2-7
D4* D4 OFF OFF OFF
D4 D1D OFF OFF ON
Dual D4 D4 OFF ON OFF
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