Section 150-232-100
Revision 01
Page 11
5. NORMAL SYSTEM OPTIONS SETTINGS
5.01 When the two HLU-232 plugs are to be used as normal, stand-alone line units, the configuration switch on the
HSA-232 Shelf Adapter must be set to NORMAL. For more details, refer to the HSA-232 Technical Practice
#100-232-100. The configuration switch on the HRE-422 (if used) must also be set to NORMAL. For more details,
refer to the HRE-422 Technical Practice #100-422-100.
5.02 The HLU-232 contains non-volatile RAM which stores the system option and Protection function settings. No
dip-switches or jumpers are required to set the HLU-232 configurations. The options are set from the buttons on the
front panel, or through the RS-232 interface, and are retained if shelf power is lost or if the HLU-232 is unplugged.
Table 2 lists the HLU-232 system option settings and Table 3 lists the protection system function settings. The
settings with an asterisk (*) represent the factory (default) settings. Not all options or functions can be set via the
front panel buttons. However, all options and functions can be set via the front panel RS-232 port. Figure 10 shows
the Systems Settings menu, and Figure 16 shows the Protection System Configuration menu.
5.03 The SETUP (MODE and SEL) momentary buttons are used to set the options from the HLU-232 front panel.
To initiate an OPTION SETTING mode, press the MODE button for at least one second, but less than three
seconds, and release. The message displayed on the front panel alternates between the first system parameter and
its current setting. Pressing the SEL button steps the display through all possible parameter settings, one at a time.
After the desired setting has been selected, press the MODE button. This updates the current displayed mode to the
setting selected, then selects the next configurable parameter. After the last parameter has been selected, the
display shows “CONF...NO” (Confirm? (Yes/No)). If the MODE button is now pressed, none of the changed
parameters are installed. If the SEL button is pressed, a “YES” message is displayed and the selected changes are
installed. In either case the display returns to its normal mode. The display also returns to its normal mode, without
installing any new changes, if neither button is pressed for 30 seconds.
5.04 All 14 user system options and 7 Protection functions can be set to the factory (default) values by pressing the
SEL button for six seconds until the message: “DFLT...NO” appears. To set the default values, press the SEL button
while the “DFLT...NO” message is displayed. “DFLT...YES” will be displayed, indicating the factory default values are
now in effect. To terminate the DFLT mode without setting the factory default values, press the MODE button or do
nothing for 30 seconds. The latter returns the display to its normal state.
5.05 When the HLU is installed in the “Primary” slot (left slot of the HSA-232), pressing the MODE button for 3 or
more seconds causes the display to scroll through the HLU’s software version number, its List #, the type of frame
pattern being received from the DSX-1, the line code setting of the HLU, all 14 option settings and the protection
BER settings. When the HLU is installed in the “Protect” slot (right slot of the HSA-232), the “Protection Mode”
setting is also displayed. The line code is the actual DS1 line code being received by the HLU if the DS1 code
pattern is set to AUTO. Otherwise the line code parameter displayed is the user selected choice of either AMI or
B8ZS.
5.06 The DS1 line code option should always be set to conform to the type of DS1 service (AMI or B8ZS) being
provided by the HiGain system. The AUTO mode, which can adapt to either AMI or B8ZS, should only be used in
applications that require it (such as when HiGain acts as a standby circuit to DS1 circuits whose line codes are not
known and may be either AMI or B8ZS) since it has the following two limitations. The AUTO mode will induce one
BPV in the DS1 bit stream whenever it switches from AMI to B8ZS. The AUTO mode allows each HiGain end (HLU
and HRU) to set its DS1 mode to the code it is receiving at its local DS1 input port. Thus, if the line codes being
received by HiGain are different in each of the two DS1 directions, the HiGain DS1 output codes will not match their
respective DS1 input codes at the other end. This could cause the customer’s received data to be AMI instead of
B8ZS and thus violate the one’s density rules by having excessive zeroes.
