Adtran Total Access 750 User Manual
3
61175012L1-5D
Section 61175012L1-5, Issue 4
enabled, after approximately eight minutes of
keyboard inactivity, the terminal times out and returns
to the password login screen.
keyboard inactivity, the terminal times out and returns
to the password login screen.
MENU NAVIGATION
To traverse through the menus, select the desired entry
and press ENTER. To work backwards in the menu
press the ESC (escape) key.
and press ENTER. To work backwards in the menu
press the ESC (escape) key.
Connections
All TA 750 BCU connections are made through the
backplane connector. With the exception of power
and the V.35 connector, all of the TA 750 rear panel
connectors terminate on the BCU. These include
backplane connector. With the exception of power
and the V.35 connector, all of the TA 750 rear panel
connectors terminate on the BCU. These include
Network T1, Clock source, Alarms, Fractional T1, and
Management. Refer to the TA 750 Chassis Installation
and Maintenance Practice, part number 61175001L1-
5, for additional information on rear panel
connections. Table 3 describes the T1 pinout
connections.
Management. Refer to the TA 750 Chassis Installation
and Maintenance Practice, part number 61175001L1-
5, for additional information on rear panel
connections. Table 3 describes the T1 pinout
connections.
Faceplate LED
The faceplate network LED labeled NETWORK T1
provides status information for the network T1 using a
color coded message format. Refer to Table 4.
provides status information for the network T1 using a
color coded message format. Refer to Table 4.
Table 2. DIP Switch S1 Options
Switch
Function
Description
S1-1
S1-3
Setting
S1-1 ............ Framing Format
Off
Off
ESF*
S1-3 ............ TR-08 Signaling
On
Off
SF
Off
On
TR-08 Digroup A
On
On
TR-08 Digroup B, C, or D
S1-2 ............ Line Code Format ..... 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.
must be configured identically with all other T1 network equipment on this circuit.
On ............... AMI
Off * ............ B8ZS
Off * ............ B8ZS
S1-4 ............ CSU Loopback ......... Enables the CSU Loopback Function. Unit will respond to CSU loopback sent from a
remote network device or test equipment.
Off * ............ Enabled
On ............... Disabled
On ............... Disabled
Timing Mode ............ Determines clock source for TA 750.
S1-5 ............ Timing A
S1-5
S1-6
Function
S1-6 ............ Timing B
Off *
Off *
Loop timing: Derives timing from T1
On
Off
External timing: Derives timing from external BITS clock
Off
On
Local timing: Clock generated from internal timing source
On
On
Loop timing: Derives timing from T1
DS1 Attenuation........Selects attenuation to set receiver sensitivity in decibels (dB).
S1-7 ............ LBO A
S1-7
S1-8
Setting
S1-8 ............ LBO B
Off *
Off *
0 dB / 0-133 ft (LBO)
On
Off
-7.5 dB
Off
On
-15 dB
On
On
-22.5 dB
(Note: additional LBO settings can be provisioned through the menu interface.)
* Denotes factory default settings.