NT8D14Universal Trunk Card Page381 of 544
Option11C and 11C Mini TechnicalReference Guide
Electrical characteristics

Electrical characteristics of the Universal Trunk Card are listed in Table 114.

Physical characteristics

In Meridian 1 Option 11C systems the NT8D14 Universal Trunk Card is

installed in slots 1 through 10 of the Main cabinet, or in slots 11 through 50

in the Expansion cabinets.

In Option 11C systems equipped with Meridian Mail, the Universal Trunk

card cannot be installed in slot 10 of the main cabinet.

Table 1 14
Universal Trunk Card electrical characteristics
Characteristic DID trunk CO trunk
Terminal impedance 600 or 900 ohms (selected by
software)
600 or 900 ohms (selected by
software)
Signaling range 2450 ohms 1700 ohms
Signaling type Loop start Ground or loop start
Far end battery - 42 to - 52.5 V - 42 to - 52.5 V
Near end battery N/A - 42.75 to - 52.5 V
Minimum loop current N/A 20 mA
Ground potential difference + 3 V + 3 V
Low DC loop resistance
during outpulsing
N/A < 300 ohms
High DC loop resistance N/A Ground start equal to or
greater than 30 kohms; loop
start equal to or greater than
5 Mohms
Line leakage Equal to or greater than
30kohms (tip to ring, tip to
ground, ring to ground)
Equal to or greater than 30
kohms (tip to ring, tip to
ground, ring to ground)
Effective loss See“PAD switching” on
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See“PAD switching” on
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