IBM 8239 Token-Ring Stackable Hub, Setup And User Manual

Page: 22 / 141

Figure 1-2. 8239 Model 2
The Model 1, in addition:
¹
Supports additional concentrator functions
¹
Provides network management functions
¹
Supports in-band connectivity
¹
Supports connection to other compatible concentrators
Features
The following optional features are available for the 8239.
¹
16-Port Expansion Feature
The 16-Port Expansion Feature contains 16 RJ-45 token-ring ports, increasing
the supported number of ports in a single 8239 from 16 to 32. The 16-Port
Expansion Feature can be installed in the feature slot of the 8239.
¹
RI/RO Module (Model 1 only)
Use the Ring In/Ring Out Module (RI/RO Module) to connect to another 8239
stack or to other compatible concentrators, such as:
– Token-Ring 8228 Multistation Access Unit
– 8230 Token-Ring Network Controlled Access Unit
– 8238 Token-Ring Stackable Hub
– 8260 Nways Multiprotocol Switching Hub
It is installed in the RI/RO Module slot on the Model 1. There are two types of
RI/RO Module:
– RJ-45 RI/RO Module, providing an RJ-45 copper interface
– Optical Fiber RI/RO Module, providing an ST-connector optical fiber
interface
1-2
8239 Setup and User’s Guide