Instruction manual

Total Access 850 System Manual Section 2 Engineering Guidelines
64203376L1-1B © 2004 ADTRAN, Inc. 27
S1-2 Line Code Enables Bipolar Eight-Zero Substitution (B8ZS), which allows
for Clear Channel operation for the T1 carrier system, or
enables Alternate Mark Inversion (AMI). This option must be
configured identically with all other T1 network equipment on
this circuit.
ON* AMI
OFF B8ZS
S1-3 TR-08 Signaling Enables or disables the TR-08 signaling option. When enabled,
S1-1 is ignored.
ON* Enabled
OFF Disabled
S1-4 CSU Loopback Enables the CSU loopback function. When this switch is
enabled, the Total Access 850 will respond to CSU loopbacks
sent from a remote network device or test equipment.
ON Disabled
OFF* Enabled
S1-5
S1-6
Timing Mode A
Timing Mode B
Determines the clock source options for the Total Access 850
system.
S1-5/S1-6 Function
OFF/OFF Loop timing: Derives timing from the network T1.
ON/OFF External Timing: Derives timing from the external
bits clock.
OFF/ON Local Timing: Clock generated from internal
timing source.
ON*/ON* Loop Timing: Derives timing from the network T1.
S1-7
S1-8
Line Build Out A
Line Build Out B
Sets the attenuation properties to configure the receiver
sensitivity in decibels (dB).
Additional settings can be provisioned through the terminal
menu interface.
S1-7/S1-8 Setting
OFF/OFF 0 dB/0-133 ft
ON/OFF -7.5 dB
OFF/ON -15 dB
ON*/ON* -22 dB
* Denotes factory default settings.
Table 2. BCU DIP-Switch S1 Options (Continued)
Switch Function Description