ADTRAN Total Access 850 System Manual page 27

Total Access 850 System Manual
Switch Function
S1-2 Line Code
S1-3 TR-08 Signaling
S1-4 CSU Loopback
S1-5 Timing Mode A
S1-6 Timing Mode B
S1-7 Line Build Out A
S1-8 Line Build Out B
* Denotes factory default settings.
64203376L1-1B
Table 2. BCU DIP-Switch S1 Options (Continued)
Description
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*
OFF
Enables or disables the TR-08 signaling option. When enabled,
S1-1 is ignored.
ON*
OFF
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
OFF*
Determines the clock source options for the Total Access 850
system.
S1-5/S1-6
OFF/OFF
ON/OFF
OFF/ON
ON*/ON*
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
OFF/OFF
ON/OFF
OFF/ON
ON*/ON*
© 2004 ADTRAN, Inc.
Section 2 Engineering Guidelines
AMI
B8ZS
Enabled
Disabled
Disabled
Enabled
Function
Loop timing: Derives timing from the network T1.
External Timing: Derives timing from the external
bits clock.
Local Timing: Clock generated from internal
timing source.
Loop Timing: Derives timing from the network T1.
Setting
0 dB/0-133 ft
-7.5 dB
-15 dB
-22 dB
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