Table Of Contents
Cisco 828 and SOHO 78
in Back-to-Back Deployments
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
Service providers can deploy Cisco 828 or SOHO 78 G.SHDSL routers to serve customers with a high-speed DSL WAN service where a DSLAM has yet to be deployed. These customers could include those in a metropolitan area with copper lines connecting a service provider's central office (CO) location and an end customer site.G.SHDSL routers can be set up between locations in which a limited number of customers are to be served in this particular geography and the purchase and deployment of a DSLAM is not cost-effective.
The Cisco 828 or SOHO 78 G.SHDSL Router in the CO would be connected through the Ethernet LAN port to a service provider's network with each G.SHDSL port connecting the two sites with copper wiring. If an increase in potential customers for G.SHDSL service warrants the installation of a DSLAM, the existing customers can continue to use their Cisco 828 or SOHO 78 routers, and their WAN links can be moved from the back-to-back deployment to a connection on a DSLAM line card. The routers that were formerly used
in the CO can then be redeployed to new customers or
to other locations in the service-provider network.
Additionally, service providers looking to turn on
a high-speed service very quickly can simply provide
a Cisco 828 or SOHO 78 Router to the end customer
and add an additional router at the other end of the line
to turn on the service. A pool of Cisco 828 or SOHO 78 routers could be kept on hand to immediately support customers where a DSLAM has yet to be deployed for quicker customer service and an immediate path to revenue. For service-providers who wish to serve a limited number of customers who are beyond the reach of other DSL services, Cisco 828 or SOHO 78 routers can be deployed in the same CO to serve this limited customer set.
Figure 1: Cisco 828 or SOHO 78 G.SHDSL Routers Deployed in a Back-to-Back Environment by a Service Provider
Enterprise Campus Deployments
When an enterprise customer has several buildings
on a campus connected by copper wiring, those buildings can be linked with Cisco 828 and SOHO 78 routers. Again, if the enterprise owns or leases the copper-wiring infrastructure, these connections can be used to provide inter-building connections with speeds up to 2.3 Mbps. Each LAN within the building would connect with the Cisco 828 or SOHO 78.
Figure 2: Cisco 828 or SOHO 78 G.SHDSL Routers Deployed in a Back-to-Back Environment at an Enterprise Campus
Enterprise Office Building Deployments
Another example of a back-to-back application is a business located within a high-rise or office building. If the business has access and ownership of the copper-wiring infrastructure within the building, offices not connected with existing Ethernet cabling can take advantage of the copper connections between the offices for inter-office connectivity.
Figure 3: Cisco 828 or SOHO 78 G.SHDSL Routers Deployed in a Back-to-Back Environment at an Enterprise Office Complex
Benefits of G.SHDSL Back-to-Back Deployments
The benefits of using G.SHDSL in a back-to-back router deployment include low-cost, fast installations of high-speed service. In all instances, ownership and access to the copper wiring must be available to the customer, and the wiring must meet the technical requirements as stated in the G.SHDSL standard. Both Service Providers and Enterprise Customers can benefit from the following:
•Low cost broadband solution with minimal infrastructure cost and no DSLAM required
•Simple deployment for rapid service turn on by
Service Providers or Enterprises
•Centralized, secure WAN or Internet connection
rather than having individual connections at offices
or buildings in Enterprise environments
•Service for a small customer base prior to deploying
a DSLAM by Service Providers
Easy Deployment with Cisco 828 and
SOHO 78 G.SHDSL Routers
The Cisco 828 G.SHDSL Router offers small-office and teleworkers business-class features such as a stateful inspection firewall, support for virtual private networks (VPNs) with IP Security Triple Digital Encryption Standard (IPSec 3DES), and quality of service (QoS) features for voice and video applications. The Cisco SOHO 78 provides affordable multiuser access with a single WAN connection. Both products offer an integrated four-port hub, and through the power of Cisco IOS® Software, offer business-class reliability and remote management capabilities. Technicians with knowledge
of Cisco IOS Software can easily configure both models, and users without knowledge of Cisco IOS Software
can use the Cisco Router Web Setup tool, which is a Web-based graphical user interface (GUI) that allows
for quick router setup.
The Cisco 828 and SOHO 78 G.SHDSL routers offer back-to-back capabilities that make them the ideal cost-effective solution for connecting small offices in limited G.SHDSL deployments. If the customer owns
and has access to the copper wiring, G.SHDSL with the
Cisco 828 and SOHO 78 can provide easy-to-deploy multimegabit service.