IBM 3745 Series, Справочник по техническому обслуживанию оборудования

Страница: 293 / 712

Two V.35 Cables Connected (Example)
FESH Card Tail gate Cables
────────────────┐
│
┌┴┐ Port 1 ┌─┐ ┌─┐ ┌─┐ V.35 ┐ To DCE
V.35 ────┤ ├─────────────│──────────┤ │ J2 │ ├───── │
└┬┘ └┬┘ └─┘ └─┘ │ or
│ │
┌┴┐ Port 2 │ ┌─┐ ┌─┐ ┌─┐ V.35 │ Direct
V.35 ─ ─ ┤ ├ ─ ─ ─ ─ ─ ─ ─ ─ ─│─ ─ ─┤ │ J1 │ ├─ ─ ─ │ Attach
└┬┘ │ └┬┘ └─┘ └─┘ ┘ DTE
│ └──────┘
────────────────┘ Mutually Exclusive
Two X.21 Cables Connected (Example)
FESH Card Tail gate Cables
────────────────┐
│
┌┴┐ Port 1 ┌─┐ ┌─┐ ┌─┐ X.21 ┐ To DCE
X.21 ────┤ ├─────────────│──────────┤ │ J2 │ ├───── │
└┬┘ └┬┘ └─┘ └─┘ │ or
│ │
┌┴┐ Port 2 │ ┌─┐ ┌─┐ ┌─┐ X.21 │ Direct
X.21 ─ ─ ┤ ├ ─ ─ ─ ─ ─ ─ ─ ─ ─│─ ─ ─┤ │ J1 │ ├─ ─ ─ │ Attach
└┬┘ │ └┬┘ └─┘ └─┘ ┘ DTE
│ └──────┘
────────────────┘ Mutually Exclusive
One V.35 and One X.21 Cables Connected (Example)
FESH Card Tail gate Cables
────────────────┐
│
┌┴┐ Port 1 ┌─┐ ┌─┐ ┌─┐V.35/ ┐ To DCE
V.35 ────┤ ├─────────────│──────────┤ │ J2 │ ├───── │
(X.21) └┬┘ └┬┘ └─┘ └─┘ X.21 │ or
│ │
┌┴┐ Port 2 │ ┌─┐ ┌─┐ ┌─┐X.21/ │ Direct
X.21 ─ ─ ┤ ├ ─ ─ ─ ─ ─ ─ ─ ─ ─│─ ─ ─┤ │ J1 │ ├─ ─ ─ │ Attach
(V.35) └┬┘ │ └┬┘ └─┘ └─┘ V.35 ┘ DTE
│ └──────┘
────────────────┘ Mutually Exclusive
The FESH supports the CCITT standard V.35 interface. All interface signals conform to the electrical
specifications as stated in the various CCITT standards.
X.21 Interface
The HSS supports the 1987 CCITT X.21 standard for transmitting data at speeds up to
2.048 Mbps.
Cable Diagrams
DCE interface signals exit the FESH using two top card connectors, one for interface 1 and one for
interface 2.
Each interface cable contains the V.35, X.21, and cable ID signals to the 3745 tail gate.
All balanced signals use twisted pairs from the tail gate to top card connector.
Chapter 5. High Performance Transmission Subsystem (HPTSS)
5-41