IBM 990 Fiber Quick Connect (FQC) for ESCON Quick Connect

Chapter 3. I/O system structure 95
Draft Document for Review April 7, 2004 6:15 pm 6947ch03.fm
A maximum of 1024 ESCON ports can be activated on a z990 server. This maximum requires
sixty-nine16-port ESCON channel cards to be installed. The z990 model A08 can have up to
720 ESCON ports, on 48 channel cards, which is limited by the number of STIs available on
the A08 model.
16-port ESCON channel sparing
The last ESCON port on a 16-port ESCON channel card (normally J15) is assigned as a
spare port. Should an LIC-CC-enabled ESCON port on the card fail, the spare por t is used to
replace it, as shown in Figure3-11 on page 95.
If the initial first spare port (J15) is already in use and a second LIC-CC-enabled port fails,
then the highest LIC-CC-protected port (for instance, J14) is used to spare the failing port.
Figure 3-11 16-port ESCON channel sparing
Channel port sparing can only occur between ports on the same 16-port ESCON card. That
is, a failing ESCON channel port cannot be spared with another port on a different 16-port
ESCON card.
Channel sparing is a service repair action performed by an IBM service representative (SR)
using the z990 server maintenance package Repair and Verify procedure. If sparing can take
place, the IBM SR moves the external fiber optic cable from the failing port to the spare port.
When sparing occurs, the PCHID moves to the spare port (PCHID 112 in Figure3-11). If
sparing cannot be performed, the 16-port ESCON card is replaced.
Fiber Quick Connect (FQC) for ESCON “Quick Connect”
The Fiber Quick Connect (FQC) features are optional features for factory installation of the
IBM Fiber Transport System (FTS) fiber harnesses for connection to ESCON channels in the
I/O cage. Each direct-attach fiber harness connects to six ESCON channels at one end and
one coupler in a Multi-Terminated Push-On Connector (MTP) coupler bracket at the op posite
end. When ordered, the features support all of the installed ESCON features in all of the
installed I/O cages. FQC cannot be ordered on a partial or one cage basis.
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
CHANNEL
SPARING
ESCON-16
J00
J01
J02
J03
J04
J05
J06
J07
J08
J09
J10
J11
J12
J13
J14
J15
ESCON-16
SPARE
CHANNELS
J00
J01
J02
J03
J04
J05
J06
J07
J08
J09
J10
J11
J12
J13
J14
J15
PCHID
Number
Failure
Channel Sparing
110
111 120
121
112
113 122
123
110
111 120
112
113 122
123
121 121