Adtran 850 User Manual
4
Issue 2, August 2001
61200373L1-5B
Table 3. DIP Switch S1 Options
Switch
Function
Description
S1-1
Framing Format
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.
Format (SF). This option must be configured identically with all other T1
network equipment on this circuit.
On*
SF
Off
ESF
S1-2
Line Code
Format
Format
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.
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 TR-08 signaling option. When enabled, S1-1 is ignored.
On*
Enabled
Off
Disabled
S1-4
CSU Loopback
Enables the CSU Loopback Function. Unit will respond to CSU loopback
sent from a remote network device or test equipment.
sent from a remote network device or test equipment.
Off*
Enabled
On
Disabled
S1-5
S1-6
Timing Mode
Timing A
Timing B
Determines clock source for TA 850.
S1-5
S1-6
Function
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.
S1-7
S1-8
DS1 Attenuation
LBO A
LBO B
Selects attenuation to set receiver sensitivity in decibels (dB).
S1-7
S1-8
Setting
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.)
interface.)
*Denotes factory default setting.