Cisco Router 828 روتر سیسکو

Cisco 828 and SOHO 78 G.SHDSL routers offer an affordable broadband WAN access solution that can be carried over existing copper telephone lines. The routers provide a symmetrical WAN connection at speeds up to 2.3 Mbps with
a 20,000-foot distance limitation. As with asymmetric DSL (ADSL), G.SHDSL solutions typically are deployed by service providers connecting G.SHDSL routers with DSL Access Multiplexors (DSLAMs) or IP multiservice switches that contain corresponding G.SHDSL

line cards. However, the technical specifications for the G.SHDSL standard allow two G.SHDSL routers to directly connect with copper wiring
in a back-to-back configuration. This back-to-back scenario allows two Cisco 828 or Cisco SOHO 78 G.SHDSL routers to connect without a DSLAM or IP DSL Switch between the units.

Customers can deploy a back-to-back configuration to take advantage of existing copper wiring in a building, campus, or neighborhood where DSLAM aggregation equipment is not deployed or where a DSLAM investment and the corresponding infrastructure are not part of the business plan. Applications for a back-to-back deployment may include:

•A service provider wanting to service only
a few select customers in a metropolitan area

•An enterprise or educational institution that wants to connect campus buildings through telephone wiring

•A high-rise building where a limited number
of tenants require broadband

•A business wanting to connect two offices 
inside a building that has unused copper telephone lines

•Temporary installations such as trade shows
or construction sites

•Government or local agencies with the right
of way for using or deploying copper wiring including environments such as train stations
or airports