Cisco 2500 Series
The Cisco 2505, 2507, and 2516 are fully integrated hub/routers that enable remote offices to provide both LAN and internetwork connectivity. These hub/routers combine the functions of a stand alone hub and router in one chassis to provide simpler setup, improved serviceability and reliability, and integrated remote Simple Network Management Protocol (SNMP) network management.
In addition, through the BRI port, dial-up access is provided for backup or for low-cost, high-speed connectivity to private or public inter-networks. The two high-speed, synchronous serial WAN interfaces on each model deliver unprecedented flexibility, enabling access to leased lines, packet- and circuit-switched services, as well as -support of legacy systems such as IBM Synchronous Data Link Control (SDLC) devices.
All models use low-cost, unshielded twisted-pair cable wired in a star configuration for easy installation and offer from 8 (Cisco 2505), 14 (Cisco 2516), or 16 (Cisco 2507) Ethernet 10BaseT hub ports. No hub-to-router cabling is require. Everything is neatly contained in one compact desktop, rack-, or wall-mounted chassis.
Cisco 2500 hub/routers are available with a range of software -features that deliver significant savings on transmission costs. Dial-on-demand routing (DDR) facilitates use WAN links only when necessary. This reduces the cost of wide-area access and makes efficient use of ISDN or serial dial-up lines as alternatives to costly leased lines. The Cisco 2500 family of hub/routers also supports link compression for up to 128 kbps with Link Access Procedure, Balanced (LAPB) encapsulation, X.25 payload -compression, and Frame Relay header compression.
Dial backup provides a more economical solution than a second leased line when users require a backup link for disaster recovery. If access over the primary WAN link fails, the second dial-up line is automatically brought on line. This feature also supports the -activation of a second line for load-share traffic if the primary link becomes congested.