8250 Hubs and 8260 Hubs are used to connect end-stations, servers, and other shared devices to form local area networks (LANs). The hub may include management modules, media modules (concentrators, transceivers, and repeaters) terminal servers, bridges, routers, ATM Switches, and controllers. Controllers are the only mandatory module. Each hub must have at least one controller.
Bridge and Router modules can be used to connect segments within the same hub, to other LANs, and to wide area networks (WANs). The terminal server module can be used to connect several terminals to any network node, providing network connectivity for dumb terminals.
Several types of media (for example UTP, STP, and fiber) and connectors (for example RJ-45S, BNC, and fiber) are supported. Using the appropriate cabling, end stations can be connected to media modules. Some modules can also be used to extend the LAN between hubs.
All modules are hot swappable. Modules that support fault tolerance can have dual links and backup ports.
Depending on the type of module, there are three types of switching that can be used:
The architecture used by the 8250 Hub allows up to three Ethernet, four FDDI, or seven Token-Ring networks to run in a single hub. Modules operating under each of these protocols will operate simultaneously in the same hub.
Modules operating under each network provide exceptional flexibility for load balancing and network changes. Additionally, you can isolate a module from the backplane so that its ports can communicate without passing through the backplane. In the case of per-port switching (PPS) modules, you can select the ports you want to isolate without isolating every port on the module.
The architecture used by the 8260 Hub supports ATM and allows up to eight Ethernet, four FDDI, or seventeen Token-Ring networks to run in a single hub. Modules operating under each of these protocols will operate simultaneously in the same hub.
Additionally, you can configure different isolated networks on the same module so that the ports assigned to these networks communicate without impacting the backplane and other isolated segments on the module.
The 8260 Hub also provides a cost-efficient management architecture that consolidates media management in a single card, the Distributed Management Module (DMM).
The 8265 ATM switch is a modular chassis that is based on the 8260 ATM architecture with increased (four times more) switching capacity. The 8265 architecture is designed to meet the requirements of the next generation of high-end ATM backbone networks by providing high aggregate throughput and high-speed port density.
Besides being used as a backbone switch, the 8265 can also be used as a building switch for native ATM/LAN switching. It allows you to interconnect ATM network protocols and is fully compatible with existing 8260- and 8285-based ATM networks.
The 8265 architecture combines the strengths of single stage switching, distributed buffer pools, and ATM traffic management. In addition to the support of all ATM Class of Services (CBR, VBR, ABR and UBR), the 8265 provides advanced traffic management functions, such as traffic shaping at VP level, statistics at connection level, traffic policing, and port mirroring. The 8265 supports a very rich set of ATM interfaces, signalling, and PNN1-1 features.
The 8265 provides:
The 8265 supports 8260 ATM modules as well as 8265-specific ATM modules, including:
The 8265 brings a set of new enhanced ATM control and traffic management capability. These functions are fully distributed on each 8265 module as opposed to a centralized function residing on switching fabric. The distribution of functions is the key to network availability, scalability, and growth. It offers consistent performance whatever the number of the module or port. These functions are located in an ATM engine present on every ATM module and consisting of one VLSI module (for higher performance and port density) and two FPGA modules for openness to future extensions.
There are four possible interfaces when remotely accessing 8250 and 8260 hubs and 8265 ATM switches over the network :
| Note: | One connection is required for each agent to be controlled. |
| Note: | One connection is required for each agent to be controlled. |
| Note: | This provides a centralized focal point to access all the hubs and uses a graphical interface. |
| Note: | This provides a centralized focal point to access all the hubs and uses a graphical interface. |