IBM 3745 Series, Hardware Maintenance Reference

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Definition
A line interface coupler (LIC) board consists of:
Ÿ Multiplexer cards (MUXs) and
Ÿ
Line interface coupler cards (LICs).
Depending on the type of LIC implemented, the above elements are named:
LIB1 for LICs 1 to 4 on models 150-170
LIB2 for LICs 5 and 6 on models 150-170
LIB3 for LICs 1 to 4 on model 150.
┌──────────────────┬───────────────────┐
│ Model 13ð: NO
│ Model 13ð: NO │
│ 15ð: LIB1 │ 15ð: LIB2 │ Boards viewed from the rear
│ 17ð: LIB1 │ 17ð: LIB2 │ part of the machine
│ │ │
├──────────────────┼───────────────────┤
│ Model 13ð: NO
│ Model 13ð: NO │
│ 15ð: LIB3 │ 15ð: NO │
│ 17ð: LIB1 │ 17ð: LIB1 or│
│ │ LIB2 │
└──────────────────┴───────────────────┘
Multiplexer Card (MUX)
Double Multiplexer Card (DMUX)
DMUX is associated with LIC1s to LIC4s on LIB1.
:
It provides
two serial link attachments to connect to two scanner units. Each of them:
Ÿ
Converts the serial link bit stream in a suitable form for LIC buses
Ÿ Performs the serial link clock recovery, synchronization, and repowering
Ÿ Manages LIC control and clocking.
The first MUX can attach up to:
Ÿ
8 LICs to one scanner if the second one is not used.
Ÿ
4 LICs to one scanner and the second MUX either (see TSS definition).
D M U X D M U X
┌───────────┐ ┌───────────┐
│ ┌─────┐ │ ────┐ │ ┌─────┐ │
│ │ │====== │ Serial │ │ │======
│ │ MUX │====== │ ────────┼──┤ MUX │====== 4 LICs type
│ │ │====== │ link │ │ │====== 1, 2 or 4
│ │ │====== │ │ │ │======
│ └──┬──┘ │ │ │ └──┬──┘ │
│ │ │ │ 8 LICs type │ │ │
│ ┌──┴──┐ │ │ 1, 2 or 4 │ ┌──┴──┐ │
Serial │ │ │====== │ Serial │ │ │======
────────┼──┤ MUX │====== │ ────────┼──┤ MUX │====== 4 LICs type
link │ │ │====== │ link │ │ │====== 1, 2 or 4
│ │ │====== │ │ │ │======
│ └─────┘ │ ────┘ │ └─────┘ │
└───────────┘ └───────────┘
4-8
IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference