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55H6798 - IBM 16/4 Auto Token Ring ISA Adapter
- Token Ring network protocol support
- ISA bus interface
- Supports 16 Mbps and 4 Mbps speeds
- Auto-negotiation for speed
- Designed for IBM systems
- Coaxial and UTP cable support
- Legacy network adapter
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Key specifications
See full specs ↓- Network Technology
- Token Ring
- Bus Interface
- ISA
- Data Rate
- 16/4 Mbps
- Connector Type
- DB-9 (for Coaxial), RJ-45 (for UTP)
- Form Factor
- ISA Add-in Card
- Compatibility
- IBM Systems
Product details
The IBM 55H6798 is an Auto Token Ring ISA Adapter designed for older IBM computer systems. It provides network connectivity using the Token Ring protocol over a coaxial or UTP cable.
Technical Information
| Network Technology | Token Ring |
| Bus Interface | ISA |
| Data Rate | 16/4 Mbps |
Additional Specifications
| Connector Type | DB-9 (for Coaxial), RJ-45 (for UTP) |
| Form Factor | ISA Add-in Card |
| Compatibility | IBM Systems |
Description
The IBM 55H6798 is a legacy network adapter card that implements the Token Ring networking standard. Token Ring was a popular local area network (LAN) technology developed by IBM, known for its deterministic access method and robust performance in certain environments. This adapter is designed to be installed in the ISA (Industry Standard Architecture) expansion slots found in older IBM personal computers and workstations. This specific adapter supports both 16 Mbps and 4 Mbps data transfer rates, with an auto-negotiation feature that allows it to automatically select the highest common speed supported by the network. It is capable of connecting to a Token Ring network using either coaxial cable (typically via a DB-9 connector) or Unshielded Twisted Pair (UTP) cabling (via an RJ-45 connector), providing flexibility in network infrastructure choices. The 'Auto' in its designation likely refers to its ability to automatically detect and configure itself for the appropriate network speed and type. As an ISA bus adapter, the IBM 55H6798 is intended for use in older computer systems that predate the widespread adoption of PCI and PCIe interfaces. While Token Ring technology has largely been superseded by Ethernet, this adapter would have been essential for connecting IBM machines to Token Ring networks in environments where this protocol was standard. Its inclusion in a modern catalog suggests a niche market for legacy system support or archival purposes.
Condition: Refurbished
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