IBM 3745 Series, Hardware Maintenance Reference

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LIC Type 5 Panel
┌───────────┐
│ ┌───┐ │
│ ┌┘ │ │
│ │ │%├── Telephone line 1
│ └┐ │ │ connector
│ └───┘ │
│ │
┌─ DCE active (green) 1 ──┼─5O │
LEDs │ │ │
└─ DCE failed (yellow)2 ──┼─5O │
│ │
│ ┌─┐ │
│ ┌┘ └┐ │
│ │ %├─┼── PKD connector
│ └───┘ │
│ │
│ O │
│ │
│ ┌──┐ │
│ │..│ │
│ │..│ │
│ │..│%─────┼── PT2 connector
│ │..│ │
│ │..│ │
│ └──┘ │
│ 1 │
│ ┌┐ │
│ ├┤ │
│ ││ %────┼── PKD switch select
│ ┌┴┴┐
│ (to line 1 or 2)
│ └──┘ │
│ 2 │
┌─ DCE active (green) 1 ──┼─5O │
LEDs │ │ │
└─ DCE failed (yellow)2 ──┼─5O │
│ │
│ ┌───┐ │
│ ┌┘ │ │
│ │ %─┼─┼── Telephone line 2
│ └┐ │ │ connector
│ └───┘ │
│ │
└───────────┘
1 lit DTR is ON (green LED)
2 lit Severe local DCE error is detected (yellow LED)
1 and 2 flashing LIC card plugged in a wrong place
Line Specifications
Ÿ 4-wire non-switched lines
Ÿ US and Canada: non-conditioned
Ÿ Other countries: CCITT M.1020 or M.1025 conditioning.
Line Spectrum
Ÿ V.27 bis
– Centered on 1800 Hz
– Spreads from 1000 to 2600 Hz.
Ÿ
Native and V.29
– Centered on 1700 Hz
– Spreads from 450 to 3050 Hz, including a 12.5 % roll-off.
Chapter 4. Transmission Subsystem (TSS)
4-65