Verilink AS420 (34-00294) Product Manual - Manual (Page 17)

I n s t a l l a t i o n a n d C o n f i g u r a t i o n 9
Power
Plug the connector from the power supply into the unit. Plug the transformer
into an appropriate outlet. This applies power to the unit.
Configuration
This section describes the configuration of the AS420 . This unit is configured
using the rear panel DIP switches. Refer to Figure 2.1 for switch locations.
Figure 2.1 Verilink AS420
The switches are read every two seconds. Any change in the DIP switch
configuration takes effect within a four-second period.
Configuration Switch S1
Switch S1 is located on the rear panel. This switch provides the following
configuration parameters.
E1 Mode Settings
Framed E1. Position S1-1 sets the unit to receive and transmit framed or
unframed signals. The default is Framed (Down).
CRC-4. Position S1-2 is used to enable or disable CRC4 for the equipment.
The default is Disabled (Down).
CAS Signalling. Position S1-3 sets the unit to receive and transmit CAS
signalling in frame 16 of a framed E1 signal. The default is Disabled (Down).
Timing Mode. Position S1-4 sets the timing mode. When Network (Down)
timing is selected, the unit recovers timing from the network signal. Internal
timing recovers the clock from the unit’s internal circuitry.
Front Panel Rocker. Position S1-6 enables and disables the front panel
rocker switch to prevent inadvertent loopbacks. The default is Enabled
(Down).
Not Used. Positions S1-5, S1 -7, and S1 -8 are reserved for future use.