Chapter 9. 8260 Token-Ring Modules
This chapter will describe the token-ring modules for the 8260 multiprotocol
intelligent switching hub. Each module will be described along with its features
and the necessary steps required to configure these modules. Currently, the
available 8260 token-ring modules are:
•18-port Active Per Port Switching Module
•18-port Active Module Switching Module
•Dual Fiber Repeater Module
•20-port Passive Module Switching Module
•Jitter Attenuator Daughter Card

9.1 Introduction

The 8260 token-ring modules can only be connected to the token-ring segments
on the ShuntBus. They cannot be attached to the token-ring segments on the
Enhanced TriChannel. You can also install and use any 8250 token-ring module
in the 8260 multiprotocol intelligent switching hub. The 8250 token-ring modules
can only be connected to the token-ring segments on the Enhanced TriChannel.
Therefore, a token-ring segment on the 8260 can consist of 8250 or 8260
token-ring modules. However, you may use RI/RO connections, bridges or
routers to connect the 8260 token-ring segments consisting of 8260 modules to
the token-ring segments consisting of 8250 modules.
For information about 8250 Ethernet modules please refer to
IBM 8250 Intelligent
Hub and IBM HUB Management Program/6000,
GG24-4033.

9.2 Configuring Token-Ring Network Parameters

Before discussing the individual 8260 token-ring modules and how to configure
them, this section describes the parameters that may be configured for each
network segment to which the 8260 token-ring modules and ports are to be
attached.
The following is the summary of parameters that may be configured for each
token-ring segment:
•Enable/disable automatic beacon recovery
Use the following command to enable/disable the automatic beacon recovery
for each segment to which the ports or modules are to be attached:

SET NETWORK {network} BCN_RECOVERY {enable|disable}

Note that if you disable this feature, any beacon condition on the network will
disrupt the operation of the network until you remove the source of
beaconing from the ring.
•Set the ring speed
You must set the ring speed for the backplane or isolated segment using the
following command:

SET NETWORK {network} RING_SPEED {4_mbps|16_Mbps}

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