ADC CUDA 3 - Manual (Page 380)

ADC Telecommunications, Inc.
378 C HAPTER 18: C ONFIGURING C ABLE M ODEM T ERMINATION S YSTEMS
Plant-delay
The Plant-delay parameter specifies the maximum round-trip propagation
delay in the cable plant. This value is used to adjust the map lead time. It is
recommended that a low value be used to reduce cable modem access delay.
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For a cable plant of 25 miles, the recommended value is 400.
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For a cable plant of 100 miles, the recommended value is 1600.
You set the plant delay for the current cable interface by performing the
following tasks.
PLL State
Phase-locked loops (PLL) are circuits that hunt and synchronize to an external
signal. The PLL State value should be zero; this indicates normal operation. A
PLL State value of non-zero, indicates a malfunction of the CMTS module.
The PLL state is displayed as part of the show interface cable mac
display. You can also verify the PLL State by performing the following task.
Task Command
1. Enter interface cable mode. interface cable
2. Configure plant delay. plant-delay
Task Command
1. Enter interface cable mode. interface cable
2. Verify PLL state of the current
cable interface.
show interface cable pll-state