IBM 3745 Series, Hardware Maintenance Reference

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Cycle Steal Grant (CSG) and Autoselection Mechanism for Model
130 With TPS
BOARD ð1G-A1
T T
& CSG-bypass &
│ ┌─────────┬─────────┬─────────┐ CSG-L │ CSG-H
│ │ ┌────┐ │ ┌────┐ │ ┌────┐ │ ┌────── │ ┌─────────┐ ┌────┐ ┌──────
│ │ │ B │ │ │ D │ │ │ F │ │ │ H J K │ L │ M N │ P Q R │ S │ T │ U V
│┌┴┐ │┌─┐ │┌┴┐ │┌─┐ │┌┴┐ │┌─┐ │┌┴┐ │┌─┐ ┌─┐ ┌─┐ │┌─┐ │┌─┐ ┌─┐ │┌─┐ ┌─┐ ┌─┐ │┌─┐ │┌─┐ │┌─┐ ┌─┐
└┼B┼─┘│C│ └┤C│%┘│C│ └┼B┼─┘│C│ └┤C│%┘│C│ │T│ │T│ └┤T│%┘│T│ │T│ └┤T│%─┼B┼──┤C│%┘│S│ └┤C│%┘│S│ │P│
│P│ │A│ │A│ │A│ │P│ │A│ │A│ │A│ │I│ │I│ │R│ │I│ │I│ │R│ │P│ │S│ │e│ │S│ │e│ │U│
│C│ │D│ │L│ │D│ │C│ │D│ │L│ │D│ │C│ │C│ │M│ │C│ │C│ │M│ │C│ │P│ │e│ │P│ │e│ │C│
┌┼1┼─┐│R│ ┌┤ │%┐│R│ ┌┼1┼─┐│R│ ┌┤ │%┐│R│ │ │ │ │ │ │ │ │ │ │ │ │ │1│ │ │ │$│ │ │ │$│ │ │
│└┬┘ │└─┘ │└┬┘ │└─┘ │└┬┘ │└─┘ │└┬┘ │└─┘ └─┘ └─┘ └─┘ └─┘ └─┘ └─┘ └─┘ └─┘ └─┘ └─┘ └─┘ └─┘
│ │ │ │ │sa│mple│ │ │ │ │ │ LAð4 LAð3
│ │ └────┘ │ └────┘ │ └────┘ │ │
│ │ sample│ out │bypass │ │
│ └─────────┴─────────┴─────────┘ │
│ sample out wrap dot │
└──────────────────────────────────┘
$ = Can be FESH or EAC card.
BPC1 card installation rules
Ÿ
Channels adapters:
One BPC1 card is required in positions A2 and E2 for TPS.
Ÿ
Line Adapters:
– If no TRA is installed: No BPC1 or BPC2 are required.
– If a TRA is installed:
One BPC1 is required in position Q2. One BPC1 is required in positions
R2 and T2 if no CSP is installed. One BPC2 is required in position P2.
– If two TRAs are installed:
One BPC1 is required in position Q2. One BPC1 is required in position R2
and T2 if no CSP is installed.
Cycle Steal Grant (CSG) for Model 150
BOARD ð1G-A1 CSG-H
T ┌──────────────┐ ┌─────────┐ ┌──────
A B C D E F G H J K │ L │ M N P │ Q │ R S │ T │ U V
┌ ┐ ┌ ┐ ┌ ┐ ┌ ┐ ┌ ┐ ┌ ┐ ┌ ┐ ┌ ┐ ┌─┐ ┌─┐ │┌─┐ │┌ ┐ ┌ ┐ ┌ ┐ │┌─┐ │┌ ┐ ┌ ┐ │┌─┐ │┌─┐ ┌─┐
| | | | | | | | | | | | | | | | │T│ │T│ └┤T│%┘| | | | | | └┤C│%┘| | | | └┤C│%┘│S│ │P│
| | | | | | | | | | | | | | | | │I│ │I│ │R│ | | | | | | │S│ | | | | │S│ │e│ │U│
| | | | | | | | | | | | | | | | │C│ │C│ │M│ | | | | | | │C│ | | | | │P│ │e│ │C│
| | | | | | | | | | | | | | | | │ │ │ │ │1│ | | | | | | │9│ | | | | │3│ │$│ │ │
└ ┘ └ ┘ └ ┘ └ ┘ └ ┘ └ ┘ └ ┘ └ ┘ └─┘ └─┘ └─┘ └ ┘ └ ┘ └ ┘ └─┘ └ ┘ └ ┘ └─┘ └─┘ └─┘
$ = Can be FESH or EAC card.
BPC1 card installation rules
Ÿ One BPC1 is required in position T2 if no CSP is installed.
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IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference