Nortel Baystack 500 Model 503

Nortel Baystack 500 Model 503 ... compatibility and featuring Nortel Networks' unique expansion and management capabilities, the hubs provide a powerful, standards-based platform that allows existing networks to easily grow without sacrificing existing investments. BayStack 500 Series Hubs offer 24 ports supporting host connections operating at both 4 and 16 megabits per second (Mbps). Optional front panel media dependent adapter (MDA) modules support additional station attachments or provide Ring-In/Ring-Out (RI/RO) ports for connecting to other Token Ring hubs, allowing the hubs to be easily integrated with any existing Token Ring network.

The Advanced Network Management Module (NMM) employs Nortel Networks Advanced management agent, which builds upon Standard agent capabilities. The Advanced NMM provides full RMON support, with complete implementation of RFC 1757 (which supersedes RFC 1271) and RFC 1513. The Advanced NMM also supports Optivity's Sphere Autotopology capability, which automatically discovers the physical and logical relationships between all network devices to give the network manager a comprehensive overview of the network topology.