P3602ACMC datasheet(139/212 Pages) TECCOR

139 / 212 page

TIA-968 (formerly known as FCC Part 68)

4 - 15

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Longitudinal Voltage Surge

The Type A and Type B Longitudinal Voltage Surges are applied in both positive and

negative polarity during all operational states. The Type A surge is a 1500 V, 200 A peak

surge applied to the EUT with Tip and Ring tied together with respect to Ground. The

Type B Longitudinal Voltage Surge is a simultaneous surge in which 1500 V and 37.5 A are

applied concurrently to Tip with respect to Ground and Ring with respect to Ground, as

presented in Table 4.14.

Note: Type B surge requirements guarantee only a minimum level of surge protection. For

long term reliability of terminal equipment, consideration should be given to

complying with Type A surges operationally.

On-hook Impedance Limitations

Another important aspect of TIA-968 is on-hook impedance, which is affected by transient

protection. On-hook impedance is analogous to the leakage current between Tip and Ring,

and Tip, Ring, and Ground conductors during various on-hook conditions. "On-hook

Impedance Measurements" (next paragraph) outlines criteria for on-hook impedance and is

listed as part of the Ringer Equivalent Number (REN). The REN is the largest of the unitless

quotients not greater than five; the rating is specified as the actual quotient followed by the

letter of the ringer classification (for example, 2B).

On-hook Impedance Measurements

On-hook impedance measurements are made between Tip and Ring and between Tip and

Ground and Ring and Ground. For all DC voltages up to and including 100 V, the DC

resistance measured must be greater than 5 M

W. For all DC voltages between 100 V and

200 V, the DC resistance must be greater than 30 k

W. The REN values are then determined

by dividing 25 M

W by the minimum measured resistance up to 100 V and by dividing

150 k

W by the minimum measured resistance between 100 V and 200 V.

On-hook impedance is also measured during the application of a simulated ringing signal.

This consists of a 40 V rms through 150 V rms ringer signal at frequencies ranging from

15.3 Hz to 68 Hz superimposed on a 56.5 V dc for a class “B” ringer. During this test, the

total DC current may not exceed 3 mA. In addition, the minimum DC resistance measured

between Tip and Ring must be greater than 1600

W, while the DC resistance measured

between the Tip and Ring conductors and Ground must be greater than 100 k

W. The REN

values for the simulated ringing test are determined by dividing the maximum DC current

flowing between Tip and Ring by 0.6 mA, and by dividing 8000

W by the minimum

impedance value measured.

P3602ACMC Datasheet(PDF) 139 Page - Teccor Electronics

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