AT&T DEFINITY 2500 series Network Manual page 297

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Table E-4. EIA RS-366 LEADS/DEFINITIONS
EIA
INTERCHANGE
CIRCUIT
1 AA Unassigned
2 DPR Digit Present
3 ACR Abandon Call and Retry
4 CRQ Call Request
5 PND Present Next Digit
6 PWI Power Indication
7 AB Signal Ground
8 — Unassigned
9 +P Reserved for Testing
–P Reserved for Testing
— Unassigned
— Unassigned
COS Call Origination Status
NB1 Digit Signal Circuit
NB2 Digit Signal Circuit
NB4 Digit Signal Circuit
NB8 Digit Signal Circuit
— Unassigned
— Unassigned
— Unassigned
— Unassigned
DLO Data Line Occupied
— Unassigned
— Unassigned
— Unassigned
LEAD DESCRIPTION
(FUNCTION)
LEAD DEFINITIONS
MPDM
INPUT/
OUTPUT
—
I
O
I
O
O
—
—
O
O
—
—
O
I
I
I
I
—
—
—
—
O
—
—
—
E-5