Verilink PRISM 4051 (34-00253.2) Product Manual - Manual (Page 13)

Unit Configuration 7
Boot Mode
Switch S1-1 is used to determine
whether the unit configures itself from
the DIP switches or from the saved
configuration as shown in Table 2-1. If
set to boot from the saved configuration,
the switch settings are ignored. If set to boot from switches, the unit reads the DIP
switches on power up and configures the unit accordingly. Once running,
configuration changes can be made through the terminal interface, overriding the
switch settings.
DDS Mode
Switch S1-2 is used to
establish the DDS mode as
either DDS II/64 kbps or
DDS I/56 kbps as shown in
Table 2-2.
Timing Source
Positions S1-3 through S1-4 select the source of unit
clocking. Deriving timing from the network
is the most common timing source for most DDS
applications. The unit may also be clocked from an
internal standard or from the DTE as shown in
Table 2-3.
RTS -to -CTS Delay
Switch S1-5 is used to select the
delay on an RTS-to-CTS transition as
shown in Table 2-4. When the
RTS-to-CTS control option is set to
Normal, CTS follows the state of RTS
after some delay, depending on the
data rate. The delay can be selected
for a Normal or Long delay.
RTS, CTS, and DCD Handshake
Switch S1-6 is used to
determine the handshake
process as either Force On or
Normal as shown in Table 2-5.
Local and Remote Loopback Enable
Switch S1-7 is used to enable or
disable local and remote
loopbacks on the DTE interface
as shown in Table 2-6.
Table 2-1 Boot Mode
Mode S1-1
Boot from the DIP switches Down
Boot from the saved configuration Up
Table 2-2 DDS Mode
Mode S1-2
DDS II/64 kbps Down
DDS I/56 kbps Up
Table 2-3 Timing Source
Source S1-3 S1-4
Network Down Down
Internal Down Up
DTE Up Down
Table 2-4 RTS -to- CTS Delay
Delay
DTE
Rate
Delay S1-5
Normal 56 kbps 0.4 ± 0.02 ms Down
64 kbps 0.3 ± 0.015 ms
Long 56 kbps 0.8 ± 0.04 ms Up
64 kbps 0.6 ± 0.03 ms
Table 2-5 RTS, CTS, and DCD Handshake
Handshake S1-6
Force On Down
Normal Up
Table 2-6 Local and Remote Looback Enable
Local and Remote Loopbacks S1-7
Disable Down
Enable Up