6947ch03.fm Draft Document for Review April 7, 2004 6:15 pm
94 IBM eServer zSeries 990 Technical Guide
ESCON channel port enablement feature
The 15 active ports on each 16-port ESCON feature are activated in groups of 4 ports via
Licensed Internal Code - Control Code (LIC-CC), by using the ESCON channel port feature
(feature code 2324).
The first group of 4 ESCON ports requires two 16-port ESCON features. After the first pair of
ESCON cards is fully allocated (by 7 ESCON ports groups, using 28 ports), single cards are
used for additional ESCON ports groups.
Ports are activated equally across all installed 16-port ESCON features for high availability. In
most cases, the number of physically installed channels is greater than the number of active
channels that are LIC-CC enabled. This is not only because the last ESCON port (J15) of
every 16-port ESCON channel card is a spare, but also because several physically installed
channels are typically inactive (LIC-CC protected). These inactive channel ports are available
to satisfy future channel adds.
If there is a requirement to increase the number of ESCON channel ports (minimum
increment is four), and there are sufficient unused ports already available to fulfill this
requirement, then IBM manufacturing provides an LIC-CC diskette to concurrently enable the
number of additional ESCON ports ordered. This is illustrated in Figure 3-10 on page 94. In
this case, no additional hardware is installed.
Figure 3-10 16-port ESCON - LIC-CC
An ESCON channel add will never activate the spare channel port. However, if the spare port
on a card was previously used, then the add may activate all the remaining ports on that card.
If there are not enough inactive ports on existing 16-port ESCON cards installed to satisfy the
additional channel order, then IBM manufacturing ships additional 16-port ESCON channel
card(s) and an LIC-CC diskette.
If there has been multiple sparing on a 16-port ESCON card and, by replacing that card the
additional channel add can be satisfied, the card will be replaced.
LICCC ENABLEMENT
ESCON-16
J00
J01
J02
J03
J04
J05
J06
J07
J08
J09
J10
J11
J12
J13
J14
J15
ESCON-16
SPARE
CHANNEL
J00
J01
J02
J03
J04
J05
J06
J07
J08
J09
J10
J11
J12
J13
J14
J15
ESCON-16
J00
J01
J02
J03
J04
J05
J06
J07
J08
J09
J10
J11
J12
J13
J14
J15
ESCON-16
SPARE
CHANNEL
J00
J01
J02
J03
J04
J05
J06
J07
J08
J09
J10
J11
J12
J13
J14
J15
ADD 4 ESCON
Channels
PCHID
Number
110
111
120
121
110
111
120
121
112
113 122
123