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GR 1089–Core

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GR 1089–Core

In the United States, the telecommunication network is primarily operated by the Regional

Bell Operating Companies (RBOC) who follow the standards set by GR 1089 or a derivative

thereof. GR 1089–Core (often referred to as GR 1089), “Electromagnetic Compatibility and

Electrical Safety Generic Criteria for Network Telecommunications Equipment,” covers the

requirements for telecommunications equipment connected to the outside world through

twisted pair. It also addresses the criteria for protection from lightning and AC power cross

disturbances.

Because twisted pair are metallic conductors exposed to lightning and AC power faults,

GR 1089 documents the requirements to be met by manufacturers of public switched

telephone network (PSTN) equipment to ensure safe and reliable operation.

The criteria for these standards are based on transient conditions at exposed sites, such as

remote facilities, central offices, and customers’ premises where operating companies

provide some type of primary voltage protection to limit transient voltages to 1000 V peak

for surge conditions and 600 V rms for power cross conditions.

All network equipment shall be listed by a Nationally Recognized Testing Laboratory

(NRTL) if the equipment is directly powered by Commercial AC. Network equipment located

on customer premises shall be listed by NRTL.

In conjunction with primary voltage protectors, operating companies also may incorporate

fuse links if there is the possibility of exposing the twisted pair to outside power lines. These

fuse links are equivalent to 24- or 26-gauge copper wire and are coordinated with the

current-carrying capacity of the voltage protector.

The last element of protection that may be provided by the operating company are current

limiters which, if provided, are found on the line side of the network equipment after the

primary voltage protection device. These current limiters typically come in the form of heat

coils and have a continuous rating of 350 mA.

Requirements

Equipment required to meet GR 1089 must be designed to pass:

• Both First and Second Level Lightning Surge and AC Power Fault Tests

• Current Limiter Test

• Short Circuit Test

A minimum of three units are tested for each of the operating states in which the Equipment

Under Test (EUT) may be expected to function — idle, transmit, receive, on-hook, off-hook,

talking, dialing, ringing, and testing. Table 4.1 and Table 4.2 show test connections, and

Figure 4.1 shows the connection appearances.

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