Table 3. dual liu switch settings – ADTRAN 1500 User Manual
Page 5
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