System information

Command Line Interface
4-108
efm interleave
This command sets the interleave parameters for the selected VDSL port.
Syntax
efm interleave [downstream M value] [upstream M value]
[downstream I value] [upstream I value]
no efm interleave
• M value – M is the interleaving depth index; Range: 0-64
• I value – I is the interleaving block length; Range: 4 or 8
Default Setting
• M – The interleaving depth index.
Upstream default value: 8, Downstream default value: 16
• I – The interleaving block length.
Upstream default value: 8, Downstream default value: 8
Command Mode
Interface Configuration
Command Usage
Interleaving improves Reed Solomon error correction when there is pulse
noise. A greater degree of interleaving will provide more protection against
pulse noise but will increase transmission delay and reduce the effective
bandwidth of the link. The degree of interleaving can be increased by
increasing M or I.
Example
The following example configures VDSL port 1 with –
• M - downstream value: 16, Upstream value: 8
• I - downstream value: 8, Upstream value: 8
Related Commands
efm noise-margin (4-109)
show controllers efm status (4-116)
Console#config
Console(config)#interface ethernet 1/1
Console(config-if)#efm interleave 16 8 8 8
Console(config-if)#end
Console#show controllers efm status link Ethernet 1/1
Interface Link SNR (dB) RS Errs Interleaver
DS1 DS2 US1 US2 DS.M DS.I US.M US.I PBO
------------- ---- -------------------- -------- -------------------
---
Ethernet 1/1 Up 43.0 35.0 45.0 43.0 0 16 8 8 8 on
Console#