PairGain T1L2CSXAAA, Manual, Page: 48 / 68

Loopback Operation 150-231-165-01, Revision 01
38 September 22, 1998 HLU-231 List 6E
L
OOPBACK
O
PERATION WITHOUT
D
OUBLERS
The complete family of loopbacks that a HiGain system can execute is shown in Figure 21 . The loopbacks can be
initiated from the HLU RS-232 Craft port, the HLU front-panel MODE and SEL buttons, or from a family of
Special Loopback (SPLP) in-band loopback commands.
Figure 21. HLU-231 Non-Doubler Loopback Configurations
L
OOPBACK
O
PERATION WITH
D
OUBLERS
The complete family of loopbacks that a HiGain system equipped with the HDU-409 can execute is shown in
Figure 22 . Four of those loopbacks, NDU1, NDU2; CDU1, CDU2 occur in the doubler. The loopbacks can be
initiated from the HLU RS-232 Craft port, the HLU front-panel MODE and SEL buttons, or from a family of
Special Loopback (SPLP) in-band loopback commands.