IBM 3745 Series, Hardware Maintenance Reference

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In multipoint network, the backup inbound speed may be required for only one or
several drops, while the other drops continue to operate at full speed.
Speed Setting
The speed is set at LIC installation from the PKD, and can be different for each
DCE of a given LIC type 5.
The speed setting cannot be done either by NetView or by MOSS.
Configurations
LIC type 5 DCEs are compatible with IBM 586X and 786X DCEs. They operate in
point-to-point or multipoint configurations as follows.
Point-to-Point - LIC Type 5 to LIC Type 5
┌───────────────────┐ ┌───────────────────┐
│ 3745 ┌───────┐ │ │ ┌───────┐ 3745 │
│ │ LIC5 ├─┼─────────/ /──────────┼─┤ LIC5 │ │
│ └───────┘ │ │ └───────┘ │
└───────────────────┘ └───────────────────┘
Primary Primary
Point-to-Point - LIC Type 5 to 586X or 786X
┌───────────────────┐ ┌───────┐
│ 3745 ┌───────┐ │ ┌──────┐ │ │
│ │ LIC5 ├─┼─────────/ /──────────┤ DCE ├────┤ DTE │
│ └───────┘ │ └──────┘ │ │
└───────────────────┘ Primary └───────┘
Primary or
Secondary
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IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference