User Guide: Technical Reference
SECTION 3 OPERATING THE
ioLink 4
PRELIMINARY
Customer Support (202) 333-7031
-3-5
The configuration menu displays the current configuration parameters for the modem and allows the user
to change the configuration. The items in this menu can be changed to suit the conditions of a given link.
Using the Set Factory Default command (see below) can restore all default settings, but the unit must be
restarted for the modem to reset all of the integrated circuits.
Table 3-4. Configuration Menu Parameters
Encoding
For modems configured as T1, the user may choose between AMI or
the default B8ZS. For modems configured as E1, the user may choose
between AMI or the default HDB3. B8ZS and HDB3 are zero-
suppression encoding algorithms.
T1 Data Cable
This is the approximate length of cable between the modem unit and
the user’s data source. Changing this parameter will change the pulse
shape of the DSX-1 signal transmitted from the DSX port. The cable
lengths correspond to the standard Line Build Out (LBO) settings from
+0.6 dB to +3.0 dB. This menu item is only present for T1 modems.
TX Code
RX Code
There are four choices for the PN (pseudo-random noise) sequence
used to spread and de-spread the signal. For the link, the RX code for
each modem must match the TX code for the other modem, but
different codes may be used for transmission in the two directions. See
section IV, Network Management, for more details on selecting PN
codes.
Store Config
This menu item allows the user to store the present configuration
parameters in EEPROM so that the modem will return to the same
configuration at the next power-up. When the units are shipped from
the factory, the default parameters are stored in EEPROM. If the user
changes the configuration stored in EEPROM, the factory defaults may
be restored by the Set Factory Default menu item (see below).
Set Factory Default
Selecting YES at this menu item sets the modem to the default
configuration (indicated by the parentheses in the above table).
Channel Plan
Note: A “B” channel plan is
also available which
operates at a slightly
different frequency.
This menu item allows the user to select the value of the local RF unit.
Changes made here are reflected in the Channel Plan page of the
Status Menu. This setting has no operational effect on your link and is
only used for component location monitoring.
