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.)
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