3Section 61245207L2-5, Issue 261245207L2-5C
Switch Function Description
SW1-1...... Code Select ............................................ SW1-1 On selects B8ZS line code. SW1-1 Off selects AMI.
Off .......... AMI
On .......... B8ZS
SW1-2...... Framing .................................................. SW1-2 Off selects SF. SW1-2 On selects ESF.
Off .......... SF
On .......... ESF
SW1-3...... Channel Select ....................................... Selects between Alternating and Contiguous DS0 channels.
Off .......... Alternate
On .......... Contiguous
SW1-4...... Latching Loopback ................................ Used to enable or disable latching loopbacks.
Off.......... Disabled
On .......... Enabled
SW1-5...... Loopback Timeout .................................Used to enable or disable automatic loopback timeout.
Off.......... Automatic loopback timeout is disabled
On .......... Loopback timeout is enabled and set for 20 minutes.
SW1-6...... Dumb/Smart Channel Bank Enable ...... Used to select dumb or smart channel bank operation
Off .......... Unit is provisioned for an NT1 bank with a Smart Transmit/Receive
Unit (STRU) installed. Two-state signaling available (smart mode)
On .......... Unit is provisioned for an NT1 bank with a Transmit/Receive
Unit (TRU) installed. Four-state signaling available (dumb mode)
SW1-8...... Protected Loopback ...............................Used to enable or disable protective loopback.
Off .......... Disabled.
On .......... Enabled.
Table 2. SW1 Option Settings
(Default settings are indicated in bold typeface.)
