Verilink C100 (880-502893-001) Product Manual - Manual (Page 33)

Configuration Using the DIP Switches
06/17/97 C100 and C150 T1/FT1 CSU/DSU 3-9
DSX1 coding Switch 3 position 3 selects the type of coding the unit will generate.
Position 3 Off, makes the unit generate B8ZS encoding (clear channel)
and in the On position causes the unit to generate AMI (Alternate
Mark Inversion) encoding. This coding selection, must match the
Customer Equipment connected to the DSX1 interface otherwise
intermittent errors may occur.
DSX1 line
length/build out Switch 3 positions 4, 5 and 6 control the output power of the T-1 driver
on the DSX1 interface. The driver on the DSX1 interface can support
both short haul (PBXs up to 655 feet) and long haul (other T-1 CSUs up
to 6000 feet) applications. When the DSX1 interface is connected to
customer equipment with short haul interfaces, the settings that
should be used are 133, 266, 399, 533 or 655. When the DSX1 interface
is connected to another T-1 CSU/DSU up to 6000 feet away, the
settings that should be used are the standard 0, -7.5, -15 or -22.5. The
typical setting is 0 dB/133 feet.
Idle or busy
character Switch 3 position 7 selects either an Idle or a Busy character for
insertion into the DSX1 output in all DS0s used by the Synchronous
Channel. With position 7 Off, an Idle character is inserted into all the
unused DS0s on the DSX1 interface. With position 7 On, a Busy
character is inserted into all the unused DS0s. Typically the Idle
character is the insertion character. On a few older PBXs, the Busy
character is required.