Analog 2 Wire & 4 Wire

Overview

What It Is

Frontier's Unbundled Analog 2-Wire and 4-Wire Loops provide four signaling options that are determined by point-of-termination characteristics. Two-wire analog loops support POTS while 4-wire loops let you configure other types of circuits in different ways.

How It Works

Analog 2-Wire and 4-Wire Unbundled Loops are only available to you as first come, first served.

Two-wire loops support loop-start, ground-start, loop reverse-battery or customer-provided inband signaling. Four-wire loops support duplex signaling in addition to all of the same capabilities as 2-wire loops. However, in 4-wire loops, you specify the two distinct pairs within your collocation to be connected to our loop. And, we ask you to give us two different circuit locations, one for each half of the full wire circuit.

Description

CLECs have the option of customer specified signaling on 2- and 4-wire analog loops. This service is provided subject to availability on a first-come, first-serve basis. Special construction charges may apply when appropriate facilities are not available.

In addition to the number of wires, the primary difference between a 2-wire and a 4-wire loop is that 4-wire loops support other types of circuits requiring different configurations than Plain Old Telephone Service (POTS) (see related diagrams). Furthermore, with 4-wire loops, the CLEC must specify two distinct pairs in the collocation arrangement cable to connect to the Frontier 4-wire loop. Verizon inventories the collocation arrangement cable with each pair having an active unit. A total of two different circuit locations must be specified by the CLEC, one for each half of the full wire circuit. It may also be necessary to identify which location corresponds to the transmit pair and which corresponds to the receive pair.

Availability

This element is only available to the CLEC for use in conjunction with its provision of local exchange and associated exchange access service to its end users.

Pricing

Pricing and applicable USOCs may vary by state jurisdiction and pursuant to individual carrier interconnection agreements.

See your federal and state tariffs for detailed information.

Features

The CLEC can choose from four signaling options depending on the characteristics of the point of termination. A 2-wire analog loop will support either loop-start, ground-start, loop reverse-battery, or customer-provided inband signaling. A 4-wire analog loop will support either loop-start, ground-start, loop reverse-battery, customer-provided inband, or duplex signaling.

Detailed Information

Loop-start (LS) signaling is a type of switch line signaling in which the network provides a battery source. To initiate a call, end user premises equipment provides a loop closure that causes DC loop current to flow, which the network detects.

Ground-start signaling is a type of signaling in which one side of the 2-wire loop is momentarily grounded to instantaneously obtain dial tone. Ground-start signaling is often used with PBXs.

Loop reverse-battery signaling is a type of switch line DC signaling that uses loop-open and loop-closure signals to indicate on-hook and off-hook signals in one direction, and normal battery polarity and reverse battery polarity to indicate on-hook and off-hook signals in the other direction. The end of the service that generates loop-open and loop-closure signals is called the originating end, and the other end, which generates the normal-battery polarity and reverse-battery polarity signals, is called the terminating end.

Duplex signaling is a type of DC signaling that employs symmetrical and balanced signaling equipment at each end of the loop. One simplex conductor of the 4-wire loop is used for signaling and the other simplex conductor is used for ground potential compensation.

The open end is the end of a switch service that transmits ringing and dial tone and receives address signaling. The closed end is the end of a switch service that receives ringing and dial tone and transmits address signals.

Customer Specified Signaling provides an analog facility between a Frontier central office and an end user location that is capable of supporting specified signaling at the time the service is ordered by the CLEC. The following 2-wire signaling capability is available where existing facilities and equipment permit:

No signaling (includes inband signaling furnished by the CLEC)
Loop-start closed-end at end-user Rate Demarcation Point (RDP) and loop-start open-end at the CLEC-Point of Termination (POT)
Loop-start open-end at end-user RDP and loop-start closed-end at the CLEC-POT
Ground-start closed-end at end-user RDP and ground-start open-end at the CLEC-POT
Ground-start open-end at end-user RDP and ground-start closed-end at the CLEC-POT
Loop-reverse-battery terminating at the end-user RDP and loop reverse-battery originating at the CLEC-POT
Loop-reverse-battery originating at the end-user RDP and loop reverse-battery terminating at the CLEC-POT
Unbundled P – Phone Loop
Unbundled Coin Loop

The following 4-wire signaling capability is available where existing facilities and equipment permit:

No signaling (includes inband signaling furnished by the CLEC)
Loop-start closed-end at end-user RDP and loop-start open-end at the CLEC-POT
Loop-start open-end at end-user RDP and loop-start closed-end at the CLEC-POT
Ground-start closed-end at end-user RDP and ground-start open-end at the CLEC-POT
Ground-start open-end at end-user RDP and ground-start closed-end at the CLEC-POT
Loop-reverse-battery terminating at the end-user RDP and loop reverse-battery originating at the CLEC-POT (not available on a 4-wire basis when the loop facility includes DLC)
Loop-reverse-battery originating at the end-user RDP and loop reverse-battery terminating at the CLEC-POT. (This signaling capability is not available on a 4-wire basis when the loop facility includes DLC.)
Duplex (DX) signaling at EU-POT and CLEC-POT

For more information, please refer to the Unbundled Analog 2 Wire Loop Technical Specifications document.