HPTSS Data Flow
┌──────┐
│TERMI │
└───┬──┘
├───
CAs
│
├───
LSSs
HSSs
│
┌───────┬───────┐
│
│
│
├───────────5
├────────────────────────────┤ CSP │ FESH │
High
│
│
│
├─ ─ ─ ─ ─ ─5
│ IOC Bus
└───────┴──┬────┘
Speed
│
┌───────┬───────┐
│
│
│
├───────────5
Data
├────────────────────────┤ CSP │ FESH │
│
│
│
├─ ─ ─ ─ ─ ─5
Links
│
└───────┴──┬────┘
│
│
│
│
┌──────┐
│
│
│
│TERMD │
│
│
│
└───┬──┘
│
│
│
│
DMA Bus
│
│
│
├─────────────────────┘
│
│
├─────────────────────────┘
│
│
2 HSSs Maximum
┌───┴────┐
│
on Basic Board
│
│
│
Only
│ CCU
│
│
│
│
│
└───┬────┘
│
│
│
┌───┴─────────────┴───┐
│
SCTL
│
└──────────┬──────────┘
│
┌──────────┴──────────┐
│
Main Storage
│
└─────────────────────┘
Figure
5-2. HPTSS Data Flow
CSP Microcode Summary
The HSS requires a different CSP microcode load module than the LSS to take advantage of the hard-
ware buffer management for supporting speeds up to 2.048 Mbps.
Listed below are the main microcode functions supported by the HSS.
Supported line speed: up to 2.048 Mbps
Supported line interfaces: V.35 and X.21 (called X.21 Transfix in France) leased line
SDLC/HDLC duplex protocol on point-to-point leased line
A network adapter may be required, such as DCE or network communication terminal equipment
(NCTE).
Echo suppression
Frame up to 64 kbytes long (SNA maximum size)
CSP ROS common with other microcode load modules
SDLC address compare performed by FESH
NCP buffer prefixes automatically handled by FESH via DMA bus (except for SIT buffers)
The HSS transfer of data between adapter and NCP differs from the LSS:
– When the LSS transfers data to the NCP buffers, via the IOC bus, it uses the cycle steal mech-
anism.
5-8
IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference
Содержание 3745 Series
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Страница 12: ...x IBM 3745 Models 130 150 160 170 and 17A Hardware Maintenance Reference ...
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Страница 21: ...3745 Models 130 150 160 and 170 Data Flow Chapter 1 General Information 1 3 ...
Страница 149: ...For RACs 241 to 244 ERR bits Data received from the adapter Chapter 3 Buses 3 57 ...
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Страница 255: ...The HPTSS in 3745 Models 130 150 160 and 170 Data Flow Chapter 5 High Performance Transmission Subsystem HPTSS 5 3 ...
Страница 303: ...Figure 6 8 Ring to Ring via Bridge Example 2 Typical Multi Floor Wiring Chapter 6 The Token Ring Subsystem 6 9 ...
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Страница 625: ...The ESS in 3745 Models 130 150 160 and 170 Data Flow Chapter 12 Ethernet Subsystem ESS 12 3 ...
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Страница 712: ...IBM Part Number 03F5010 Printed in Denmark by IBM Danmark A S ð3F5ð1ð SY33 2ð66 4 ...