ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 46)

3. Application and Services
MSAP2000 Technical Manual V3.0 3-8
3.7. Application for DSL Services
xDSL over Optical Ethernet services possess the potential for
wide application, but its use has been limited, due to
geographical restrictions. MSAP2000 can offer various types
of xDSL services to remote areas, by using optic fiber-based
technologies to provide ADSL, ADSL2/ADSL2+ or G.SHDSL
interfaces. This can also be used to shorten subscriber loop
distances, which will in turn upgrade bandwidth service. Its
modular design can allow Service Providers to be upgraded
from a STM-1 155.52Mbps bandwidth, to Gigabit standards, at
their own pace.
SDH STIM-1 Trunk
MSAP2000’s AAM Module provides ADSL access services. A
subscriber packet is linked to the EoSM (Ethernet over SDH
Module) via a backplane bus. The EoSM encapsulates the
subscriber packet within a TDM format, using Ethernet over
SDH standards: ITU-T G.7041 GFP. The encapsulated packet
is then transmitted to the COT via a SDH trunking interface
(OIM), for connection to the next generation IP network. One
AAM Module can support 12 ADSL2/2+ subscribers, and one
shelf can accommodate up to 96 lines of ADSL. One
MSAP2000 shelf can support up to a maximum of 576 ADSL
subscriber interfaces.