LTPH-UM-1234-01

Loopback Operation in HiGain Systems

 

 

The SPLB generic command set for four-doubler loopbacks is listed in Table 7. The commands are specific combinations of either 6 or 7 bits that continuously repeat. All NDUx loopbacks are towards the network. All CDUx loopbacks are towards the customer. Figure 6 on page 24 is a diagram of the various HiGain loopbacks.

Table 7. SPLB Generic Command Set

Command Set

Loopback

 

 

 

 

NDU1

1 1 0 0 0 0

(2-in-6)

NDU2

1 1 1 0 0 0

(3-in-6)

NDU3

1 0 1 0 0 0

1

NDU4

1 0 1 0 0 1

0

CDU1

1 1 1 1 0 0

(4-in-6)

CDU2

1 1 1 1 1 0

(5-in-6)

CDU3

1 0 1 1 0 0

1

CDU4

1 0 1 1 0 1

0

 

 

 

HDU-409 Lists 1, 2, and 3

April 30, 2003

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