Zhone EtherXtend 3300 Series, User Manual

Page: 77 / 150

WAN SHDSL interfaces
EtherXtend User’s Guide
75
To display the range or options of EFM port parameters, enter show
efm-port . The following values are available on the efm-port interface.
zSH> show efm-port
efmCuPAFAdminState:----------------> enabled disabled
efmCuPAFDiscoveryCode:-------------> {260}
efmCuAdminProfile:-----------------> {8}
efmCuTargetDataRate:---------------> {1 - 999999}
efmCuTargetWorstCaseSnrMgn:--------> {-10 - 21}
efmCuThreshLowBandwidth:-----------> {0 - 100000}
efmCuLowBandwidthEnable:-----------> true false
efmCuTargetCurrentConditionMode:---> true false
efmCuTargetCurrentConditionSnrMgn:-> {-10 - 21}
efmCuTargetWorstCaseMode:----------> true false
To change or update the efm-port parameter, enter the update- efm-port
interface/type :
zSH> update efm-port 1-1-1-0/shdsl
efm-port 1-1-1-0/shdsl
Please provide the following: [q]uit.
efmCuPAFAdminState: ----------------> {enabled}:
efmCuPAFDiscoveryCode: -------------> {}:
efmCuAdminProfile: -----------------> {0x01}:
efmCuTargetDataRate: ---------------> {50000}:
efmCuTargetWorstCaseSnrMgn: --------> {0}:
efmCuThreshLowBandwidth: -----------> {0}:
efmCuLowBandwidthEnable: -----------> {false}: true
efmCuTargetCurrentConditionMode: ---> {false}:
efmCuTargetCurrentConditionSnrMgn: -> {6}:
efmCuTargetWorstCaseMode: ----------> {true}:
....................
Save changes? [s]ave, [c]hange or [q]uit: s
Record updated.
Updating efmCuTargetWorstCaseSnrMgn
When the rate selection algorithm is designed to use
efmCuTargetWorstCaseSnrMgn, the modem will select a more conservative
connect rate based on a minimum Noise Level that is artificially determined.
When efmCuTargetWorstCaseSnrMgn is set to 0dB, the modem
automatically selects the connect rate that would result in 0dB SNR margin if
the crosstalk noise level was equal to the noise in a binder fully loaded with
SHDSL links. The result is that on lightly loaded loops, the connect rate is
lower than it could be and the SNR Margin is much higher than it needs to be
for reliable operation. However, when the loop plant fills up with SHDSL
connections, the originally selected rate will still be valid, and there will be no
service interruptions caused by retraining of loops in the binder as the noise
profile changes when more links are added.
If the user would rather not use the efmCuTargetWorstCaseSnrMgn setting,
then set efmCuTargetWorstCaseMode to false. The default setting for