Sagem 4450E - Manual (Page 174)

SAGEM 3P@C
3P@C Installation Manual
Page 12-17 Reproduction and communication in any form prohibited without the written permission of
SAGEM SA
12.2. Commissioning and Maintenance of the VDSL
Subscriber Line
12.2.1. VDSL Technical Parameters
1.1.1.66 VDSL Signal Frequency Range
The VDSL access equipment of Harbor uses the VDSL system based on the IP transmission mode, and the
modulation mode is QAM, and the used signal frequency range is shown in the figure below:
Figure 12-5 VDSL frequency range
Downstream Upstream
prompt
The spectrum of VDSL, POTS, ISDN, HDSL, SDSL, and ADSL is
not cross-connected. The VDSL service can co-exist with ADSL in
the same wire bundle.
1.1.1.67 Key Technical Parameters for VDSL (Terminal resistance, PSD, SNR)
„ On the full band of VDSL, the output resistance of the equipment is 100Ω, and this resistance
can be matched with different types of non-shielded twisted pairs of most access networks.
„ The downstream and upstream signal powers are 10dBm(10mW).
„ The total maximum transmission power as required by the national standard does not exceeds
14.5dBm.
„ PSD ( Power Spectral Density): When the frequency is any value between 25kHz and 12MHz,
the transmission power spectrum density value of the upstream signals cannot exceed -
53dBm/Hz; the transmission power spectrum density value cannot exceed -60dBm/Hz when
the downstream signal is between 138kHz-3.75MHz; the transmission power spectrum density
value cannot exceed -53dBm/Hz -60dBm/Hz when the downstream signal is between 8.5MHz-
12MHz.
„ SNR (Signal Noise Ratio, that is, the ratio between signal power in the channel and the noise
power): the SNR value reflects the quality of the VDSL signal transmission on the line.
1.1.1.68 Factors Affecting the VDSL Transmission Quality
The following factors can affect the transmission quality of the VDSL service:
„ Line length