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LEAD DEFINITIONS E-5
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Table E-4. EIA RS-366 LEADS/DEFINITIONS
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PIN EIA LEAD DESCRIPTION MPDM
NO. INTERCHANGE (FUNCTION) INPUT/
CIRCUIT OUTPUT
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1 AA Unassigned —
2 DPR Digit Present I
3 ACR Abandon Call and Retry O
4 CRQ Call Request I
5 PND Present Next Digit O
6 PWI Power Indication O
7 AB Signal Ground —
8 — Unassigned —
9 +P Reserved for Testing O
10 –P Reserved for Testing O
11 — Unassigned —
12 — Unassigned —
13 COS Call Origination Status O
14 NB1 Digit Signal Circuit I
15 NB2 Digit Signal Circuit I
16 NB4 Digit Signal Circuit I
17 NB8 Digit Signal Circuit I
18 — Unassigned —
19 — Unassigned —
20 — Unassigned —
21 — Unassigned —
22 DLO Data Line Occupied O
23 — Unassigned —
24 — Unassigned —
25 — Unassigned —
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