AM79C985

PRELIMINARY Am79C985 enhanced Integrated Multiport Repeater Plus (eIMR+™) DISTINCTIVE CHARACTERISTICS s Repeater functions compliant with IEEE 802.3 Repeater Unit specifications s Direct interface with the Am79C987 Hardware Implemented Management Information Base (HIMIB™) device for building a basic managed multiport repeater s Full software backwards compatibility with existing hub designs using Integrated Multiport Repeater Plus (IMR+™)/HIMIB devices s Network management and optional feature accessibility through a dedicated serial management port s Four integral 10BASE-T transceivers with onchip filtering eliminating the need for external filter modules on the 10BASE-T transmit-data (TXD) and receive-data (RXD) lines s One Reversible Attachment Unit Interface (RAUI™) port used either as a standard IEEEcompliant AUI port for connection to a Medium Attachment Unit (MAU) or a reversed port for direct connection to a Media Access Controller (MAC) s Low cost suitable for managed multiport repeater designs s Number of repeater ports easily expandable with support for up to seven eIMR+ devices without the need for an external arbiter s All ports capable of being individually isolated (partitioned) in response to excessive collision conditions or fault conditions s Flexible LED support for individual port status and network utilization LEDs s Programmable extended distance mode on RXD lines allowing connection to cables longer than 100 meters s Link Test function and Link Test pulse...