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Customer Premises Equipment (CPE)

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SIDACtor® Data Book and Design Guide

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Customer Premises Equipment (CPE)

CPE is defined as any telephone terminal equipment which resides at the customer’s site

and is connected to the Public Switched Telephone Network (PSTN). Telephones, modems,

caller ID adjunct boxes, PBXs, and answering machines are all considered CPE.

Protection Requirements

CPE should be protected against overvoltages that can exceed 800 V and against surge

currents up to 100 A. In Figure 3.1 through Figure 3.6, SIDACtor devices were chosen

because their associated peak pulse current (IPP) rating is sufficient to withstand the

lightning immunity test of TIA-968 (formerly known as FCC Part 68) without the additional

use of series line impedance. Likewise, the fuse shown in Figure 3.1 through Figure 3.6

was chosen because the amps2time (I2t) rating is sufficient to withstand the lightning

immunity tests of TIA-968 without opening, but low enough to pass UL power cross

conditions.

The following regulatory requirements apply:

• TIA-968 (formerly known as FCC Part 68)

• UL 60950

All CPE intended for connection to the PSTN must be registered in compliance with

TIA-968. Also, because the National Electric Code mandates that equipment intended for

connection to the telephone network be listed for that purpose, consideration should be

given to certifying equipment with an approved safety lab such as Underwriters

Laboratories.

CPE Reference Circuits

Figure 3.1 through Figure 3.6 show examples of interface circuits which meet all applicable

regulatory requirements for CPE. The P3100SB and P3100EB are used in these circuits

because the peak off-state voltage (VDRM) is greater than the potential of a Type B ringer

superimposed on a POTS (plain old telephone service) battery.

150 VRMS

Ö2 + 56.6 VPK = 268.8 VPK

Note that the circuits shown in Figure 3.1 through Figure 3.6 provide an operational solution

for TIA-968 (formerly known as FCC Part 68). However TIA-968 allows CPE designs to

pass non-operationally as well.

For a non-operational solution, coordinate the IPP rating of the SIDACtor device and the I2t

rating of the fuse so that (1) both will withstand the Type B surge, and (2) during the Type A

surge, the fuse will open. (See Table 5.1, Surge Rating Correlation to Fuse Rating on page

5-8.)

Note: For alternative line interface protection circuits, see "Regulatory Compliant Solutions"

on page 4-34.

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