Enterprise System Connection (Escon) Channel Emulator; Starting Or Stopping Communications With The Tape Control Unit; Stopping Communications; Starting Communications - IBM R/S6000 7012 300 Series Operator's Manual

Enterprise System Connection (ESCON) Channel Emulator

The S/390 Enterprise Systems Connection Channel Emulator adapter provides serial
ESCON channel attachment capability between the POWERstation and POWERserver
family and high–performance System/390 tape units and tape library units.
The S/390 ESCON Channel Emulator adapter with the AIX ESCON Channel Tape
Attachment/6000 (Feature Code 5223) can be used with the following tape products:
3490 Magnetic Tape Subsystem, all models
3490E Magnetic Tape Subsystem, all models
3494 Tape Library Data Server
3495 Tape Library Data Server
The ESCON channel emulator adapter may also be attached to a tape control unit using the
ESCON Director.
Up to two ESCON channel emulator adapters may be installed in a system unit.
Since the system is directly attached to the ESCON channel of the tape control unit, careful
consideration must be made before:
Turning off the 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 Tape Control Unit

AIX Version 4.1 Enterprise Systems Connection Adapter: User's Guide and Service
Information
Changes to the online or offline status of the ESCON channel emulator 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 Tape Control
Unit:
1. Have the operator of the system stop any communications with this ESCON channel
emulator adapter.
2. Stop all application programs on this system that use this ESCON channel emulator
adapter.
3. Use SMIT to change the status of this adapter to offline . If needed, see the
POWERstation and POWERserver S/390 Enterprise Systems Connection Channel
Emulator 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 tape control unit:
3-20
Operator Guide