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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.
On* SF
Off ESF
S1-2 Line Code
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.
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.
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.)
*Denotes factory default setting.