IBM 990 - Manual (Page 108)

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zSeries 990 Technical Guide
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 Figure 3-11). 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 opposite
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.
FQC supports all of the ESCON channels in the I/O cage. FQC cannot be ordered for
selected channels.
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
CH
AN
NE
L
SP
AR
IN
G
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
C
h
an
n
el S
p
ar
in
g
110
111
120
121
112
113
122
123
110
111
120
112
113
122
123
121 121