PLANET VC-2400MR48 - Manual (Page 141)

User’s Manual of VC-820M / VC-2400MR Series
141
35. AnnexC_TCM-ISDN
SNR
The line quality is determined by using the SNR (Signal to Noise Ratio) and
applies to VDSL line connections only. SNR is the ratio of the amplitude of the
actual signal to the amplitude of noise signals at a given point in time. The higher
the SNR is, the better the line quality. Please manually adapt SNR margin
according to line quality and distance to get better performance or replace the
line with new one.
Click on the drop-down list and select the SNR to be used. Configures SNR
margin of Downstream or Upstream.
SNR margin value: 6 dB to 24 dB
Default value: 6 dB
Rate Limit DS US
„
DS : Configure the transmit rate of Maximum Downstream. The value of
downstream traffic limitation in Mbps, from the VDSL2 CO Managed
Switch to the CPE. Per port in step of 1 Mbps and 5Mbps.
Default : 101Mbp/s (bit per second)
The range between 1Mbps to 101Mbps
„
US : Configure the transmit rate of Maximum Upstream. The value of
upstream traffic limitation in Mbps, from the VDSL2 CPE to the CO
Managed Switch. Per port in step of 1 Mbps and 5Mbps.
Default : 101Mbp/s (bit per second)
The range between 1Mbps to 101Mbps
INP 30a
Configure INP with specifying Upstream or Downstream to set minimum
protection values of port provision. Click on the drop-down list and select the INP
(Impulse Noise Protection) to be used.
The range between 1 (or 0.5 for no 30a case) to 16 symbol or No Protection
Default value: 2 symbol
MaxDelay
The VDSL line type can be configured by selecting maximum Interleave delay
of Downstream or Upstream direction. Basically, there are three types
„
No limit
„
Fast mode
„
Interleave
The interleave process is use to correct data error before modulation digital
signal into analog signal. Interleave prevents error by enhanced correction but
may slow down transmit rate because packets are gathered.
Interleaved mode provides impulse noises protection for any impulse noise with
a duration less than 250 us. By configuring interleave maximum-delay, it can
prevent transmission delay caused of waiting data gathered.
To skip Interleave process, select “No delay” to operate with Fast mode.