ussp_port_number   [this is the /dev/ttyU# starting at 0]
host                        [hostname or IP address of Perle server]
remote_port_name   [name of port or channel on Perle server. For any available resource = "any"]
keep_alive               [default = 30.000]
retransmit_timeout   [default = 5.000]
transmit_delay         [default = 0.060]
queue_time             [default = 0]
max_retransmit       [default = 10]
max_packet_size     [default = 140]
inactivity_timeout     [default = 0]
trigger_characters   [default = blank]
debug   
start   

If another port requires to be defined then attributes are repeated. If attributes are the same for additional ports then it is not required to define them (see sample file below)

# Perle dial-out config file.
# written/modified by the perle configurator.
# manual editing should be allowed if you prefer.
#
ussp_port_number 0
host 165.154.129.190
remote_port_name USR2
keep_alive 30.000
retransmit_timeout 5.000
transmit_delay 0.060
queue_time 0
max_retransmit 10
max_packet_size 140
inactivity_timeout 0
trigger_characters
start
ussp_port_number 1
host 833is
remote_port_name S1IF11
start
ussp_port_number 2
host 833as
remote_port_name any
start