Table 3. Dip Switch S1 Options - ADTRAN 850 Installation And Operation Manual

Switch
S1-1 Framing Format
S1-2 Line Code
Format
S1-3 TR-08 Signaling
S1-4 CSU Loopback
Timing Mode
S1-5 Timing A
S1-6 Timing B
DS1 Attenuation
S1-7 LBO A
S1-8 LBO B
*Denotes factory default setting.
4

Table 3. DIP Switch S1 Options

Function
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.
On*
Off
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 TR-08 signaling option. When enabled, S1-1 is ignored.
On*
Off
Enables the CSU Loopback Function. Unit will respond to CSU loopback
sent from a remote network device or test equipment.
Off*
On
Determines clock source for TA 850.
S1-5
Off
On
Off
On*
Selects attenuation to set receiver sensitivity in decibels (dB).
S1-7
Off
On
Off
On*
(Note: Additional LBO settings can be provisioned through the menu
interface.)
Issue 2, August 2001
Description
SF
ESF
AMI
B8ZS
Enabled
Disabled
Enabled
Disabled
S1-6 Function
Off Loop timing: Derives timing from T1
Off External timing: Derives timing from external BITS
clock.
On Local timing: Clock generated from internal timing
source.
On* Loop timing: Derives timing from T1.
S1-8 Setting
Off 0 dB/0-133 ft (LBO)
Off -7.5 dB
On -15 dB
On* -22.5 dB
61200373L1-5B