Starting Or Stopping Communications With The Host System; Stopping Communications; Starting Communications - IBM R/S6000 7012 300 Series Operator's Manual

The ESCON channel adapter responds to channel commands similar to a 3088
Channel–to–Channel Adapter. However, this adapter does not support full emulation of a
3088.
The ESCON channel adapter may also be attached to a host system using the ESCON
Director.
Up to two ESCON channel adapters may be installed in a system unit.
Since the system is directly attached to the ESCON channel of the host system, careful
consideration must be made before:
Turning offthe system unit.
Loading and running the diagnostic programs
Connecting or disconnecting any of the cables to the adapter.
Use the following guidelines to understand the actions needed.

Starting or Stopping Communications With the Host System

An operator console for the system is required. The console may be a direct–attached
display and keyboard or an ASCII terminal.
Changes to the online or offline status of the ESCON channel adapter is made using the
System Management Interface Tool (SMIT). If there are two ESCON channel adapters
installed in this system unit, the status of each adapter must be changed individually.

Stopping Communications

Use the following steps as a guideline for stopping communications with a host ESCON
channel:
1. Have the operator of the host system stop any communications with this ESCON
channel adapter.
2. Stop all application programs on this system that use this ESCON channel adapter.
3. Use SMIT to change the status of this adapter to offline . If needed, see the AIX Version
3.2 Enterprise Systems Connection Adapter: User's Guide and Service Information for
procedures.
If you have another ESCON channel adapter in this system unit, you must use this same
procedure to stop it.

Starting Communications

Use the following steps as a guideline for starting communications with a host ESCON
channel:
1. Use SMIT to change the status of this adapter to online . If needed, see the AIX Version
4.1 Enterprise Systems Connection Adapter: User's Guide and Service Information for
procedures.
2. Start the application programs that need to use this ESCON channel adapter.
3. Have the operator of the host system start communications with this ESCON channel
adapter.
If you have another ESCON channel adapter in this system unit, you must use this same
procedure to start it.
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Operator Guide