IBM 3745 Series, Hardware Maintenance Reference

Page: 304 / 712

The Token-Ring Adapter in the 3745
Introduction
The token-ring subsystem (TRSS) allows connection to an IBM Token-Ring network which uses the token-
ring protocol.
The TRSS in a communication controller is controlled by the NCP token-ring interconnection function.
The hardware is based on a processor-driven card named token-ring interface coupler card (TIC) and the
token-ring multiplexer card (TRM). There are two types of TIC: TIC type 1 (TIC1) and TIC type 2 (TIC2).
TIC1 runs at ring-speed of 4 Mbps only. TIC2 runs at a ring-speed of 4 Mbps or 16 Mbps (the speed is
set through software).
The combination of a TRM and the associated TICs (up to two) is called a token-ring adapter (TRA). The
TICs installed with a TRM must both be either TIC1's or TIC2's. A mixture of TIC types with the same
TRM is not allowed. The combination of all the TRAs in a controller is called the TRSS.
One token-ring network can be accessed by each TIC card.
Packaging
Only one TRA may be installed on the basic board of the Models 00A and 00C and up to two TRAs in the
Model 00B. Each TRA may control up to two token-rings. The TRM interconnects with the input/output
control bus (IOC bus) and it is accessed from the CCU with a unique address as for the scanner. The two
TIC cards are connected to the TRM by a bidirectional bus called the TIC bus.
For board and card locations, see the Maintenance Information Procedures manual, SY33-2070.
┌───────────────────────────────────────────────────────────────────────────────────────┐
│ A │ B │ C │ D │ E │ F │ G │ H │ J │ K │ L │ M │ N │ P │ Q │ R │ S │ T │ U │ V │ W │ X │
│
│ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
│ C │ C │ C │ C │ C │ C │ C │ C │ T │ T │ T │ T │ T │ T │ B │ C │ F │ C │ F │ P │ S │ S │
│ A │ A │ A │ A │ A │ A │ A │ A │ I │ I │ R │ I │ I │ R │ P │ S │ E │ S │ E │ U │ C │ T │
│ L │ D │ L │ D │ L │ D │ L │ D │ C │ C │ M │ C │ C │ M │ C │ P │ S │ P │ S │ C │ T │ O │
│
│ R │ │ R │ │ R │ │ R │ 2 │ 2 │ │ 2 │ 2 │ │ 1 │ │ H │ │ H │ │ L │ │
│ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
│ C │ │ C │ │ C │ │ C │ │ │ │ │ │ │ │ │ L │ │ L │ │ │ │ │
│ A │ │ A │ │ A │ │ A │ │ │ │ │ │ │ │ │ A │ │ A │ │ │ │ │
│ 8 │ │ 7 │ │ 6 │ │ 5 │ │ │ │ │ │ │ │ │ 4 │ │ 3 │ │ │ │ │
│ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │
└───────────────────────────────────────────────────────────────────────────────────────┘
%─────────5 <††††††††─>
TRA 1 TRA 2
Figure 6-9. Basic Board Model 130
6-10
IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference