Zte zxmsg 5200 Technical Manual page 48

ZXMSG 5200 (V2.0.2) Multiplex Service Gateway Technical Manual
Higher Rate
Longer
Transmission
Distance
Low Power
Consumption
36 Confidential and Proprietary Information of ZTE CORPORATION
Besides the above three modes, ADSL2+ also supports following
three modes below. Frequency band is further divided into
smaller sub-bands.
annex I:
It is compatible to complete digital mode of ADSL over POTS
(annex A) frequency spectrum. The available uplink band can
be expanded from 3 kHz to 138 kHz if there is no POTS
service on line. It supports 31 sub-bands at the maximum.
The maximum uplink rate exceeds 1 Mbps.
annex J:
It is compatible to the complete digital mode of ADSL over
ISDN (annex B) frequency spectrum. The available uplink
band can be expanded from 3 kHz to 276 kHz if there is no
ISDN service on the line. It supports 64 sub-bands at the
maximum. The utmost uplink rate reaches to 2.3 Mbps.
annex M:
It is ADSL over POTS with the expanded uplink bandwidth.
The uplink sub-band starts from 6. The sub-bands end at 32,
36, 40, 44 to
requirements. The total transmission power keeps the same,
only the sub-band distribution is different. In this way, 3
Mbps uplink rate is available. For the downlink, the frequency
is overlap and non-overlap similar to annex B.
Compared with ADSL, ADSL2+ supports higher rate, wider
frequency and more sub-bands (512 sub-bands). The maximum
downlink rate can reach to 24 Mbps. If ADSL2 annex J is used,
the uplink rate is increased to 2.3 Mbps.
ADSL2+ supports longer transmission distance. For ADSL, the
longest transmission distance is less than 6 km. For ADSL2+,
the longest transmission distance is 6.5 km.
ADSL2+ provides power management function as follows:
Reduce the noise
decreasing transmission
useless power consumption on precondition of ensuring
stable operation.
Add the low consumption mode L2 mode. Decrease the
transmission power consumption in case that no subscriber
data is transmitted.
consumption for transmitting required management message
and synchronous signal. Resume the power consumption
when subscriber data transmits. The power consumption of
MSAG 5200 is about 30% of that in usual operation when it
is running in L2 mode.
The central office (CO) and customer premises equipment
(CPE) of ADSL2+ has the power cut back function. The
power attenuation ranges from 0 dB to 40 dB. The
transmission power consumption can be effectively cut down
63 according to
tolerance beyond
power consumption.
Ensure the
different bandwidth
requirements by
Decrease
necessary power