PairGain HiGain HLU-431 1E, Manual, Page: 37 / 68

150-431-115-01, Revision 01 Maintenance
HLU-431 List 1E September 22, 1998 27
Loopback Menu: Two Doublers
Figure 13 shows the Loopback Menu with two doublers.
Figure 13. Loopback Menu with Two Doublers
Initiating a Loopback
To send one of the available loopbacks, press the appropriate letter in the Loopback Menu. The following prompt
appears:
PLEASE WAIT................
A series of dots moves from left to right indicating that the command has been issued. When this process
completes, the system returns to the Maintenance Terminal Main Menu. The selected loopback four letter
designation now appears in the Loopback Mode field in the Maintenance Terminal Main Menu (see
Figure 14 in
which an NLOC loopback is in progress). The loopback continues to cycle in the system depending upon your
Loopback Timeout setting.
The Loopback Menu screen is also available at the HRU connected to the HLU-431, thus
allowing all HiGain System loopbacks to be initiated from either end of the circuit.
LOOPBACK MENU
TIME: 00:03:33
DATE: 02/02/98
CIRCUIT ID#:
A. DISABLE LOOPBACKS
B. NETWORK LOOP HLU (NLOC)
C. NETWORK LOOP HRU (NREM)
D. NETWORK LOOP DOUBLER 1 (NDU1)
F. NETWORK LOOP DOUBLER 2 (NDU2)
G. CUSTOMER LOOP HLU (CREM)
H. CUSTOMER LOOP HRU (CLOC)
I. CUSTOMER LOOP DOUBLER 1 (CDU1)
J. CUSTOMER LOOP DOUBLER 2 (CDU2)
(E)xit