Plantronics CA12CD Manuel utilisateur

Part No. 101987-00 Category Code: 97 Revision: C

Product Summary, CA12CD Cordless

Push-to-Talk Adaptor

2 of 12 pages CA12CD Product Summary.doc Revision: C

1Document Information

This document summarizes features of the CA12CD cordless

push-to-talk headset adaptor. It is intended for customers who

need general information about this product as an aid to their

purchasing and planning decisions. Specific details concerning

installation and use of the CA12CD are available in the CA12CD

User Guide and the Audio-Level Settings Card, both of which are

available online at the Plantronics website.

Portions of this document are based to a large extent on the

Engineering Support Document, “CS50 General Guidelines,”

Revision 1.5, by Steve Cahill.

1.1 Publication History

Revision Date Description

1 27 Mar 06

First release

2 22 Jun 06 Revise

3 20 Jul 06 Charge LEDs were amber

4 9 Aug 06 Add labels to Figure 1

A 2 Oct 06 Production release

B 14 Mar 07

Add CA12CD/A

C 03 Jan 07 Add sections on voice

privacy, range and density,

subscription, and audio

performance; delete

material duplicated in user

guide.

1.2 Document Approval

Author: Blake Cooper 27 Mar 06

Editor Date

Prepared By: Blake Cooper 27 Mar 06

Engineering Date

Approved By: Mike Erbe 27 Mar 06

Revision: C CA12CD Product Summary.doc 3 of 12 pages

1.3 Table of Contents

Titles Page No.

1Document Information 2

1.1 Publication History.......................................................................2

1.2 Document Approval.....................................................................2

1.3 Table of Contents ..........................................................................3

1.4 List of Illustrations ........................................................................3

2Product Description 4

2.1 Summary of Features....................................................................4

2.2 Functional Description .................................................................5

2.3 Product Architecture ....................................................................7

2.3.1 Base Unit.............................................................................7

2.3.2 Remote Unit .......................................................................8

3Audio Performance 8

3.1 Sidetone ..........................................................................................8

3.2 Interference ....................................................................................9

4Range and User Density 9

5Voice Privacy 10

5.1 Frequency Hopping....................................................................11

5.2 Encryption....................................................................................11

6Subscription 12

1.4 List of Illustrations

Titles Page No.

Figures:

Figure 1: Model CA12CD.........................................................................5

Figure 2: Base-Unit Block Diagram ........................................................7

Figure 3: Remote-Unit Block Diagram...................................................8

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2Product Description

2.1 Summary of Features

•Push-to-talk (PTT) switch that is robust and field-proven

•Spare battery pack

•Two charging wells—one for the remote unit, one for the spare

battery pack

•Lithium-ion batteries

•Eight hours talk time, minimum

•Quick Disconnect™ for compatibility with all Plantronics

H-Series headsets

•Receiving coarse- and fine-adjust sensitivity controls

•Selectable sending-sensitivity ranges to emulate carbon, electret,

and dynamic mics

•Sending-sensitivity fine-adjust control

•DECT™ (Digital Enhanced Cordless Telecommunications) radio

operating in the UPCS band (CA12CD) for North-American

applications and full DECT version (CA12CD/A and variants)

for areas such as the European Union and Australia.

•Compatible with most air-traffic-control and

public-safety-dispatch voice switches

•Ten-foot coiled interface cable with PJ-7 connector (other

connectors available upon request)

•LEDs for RF link, PTT, base power, and battery-charging status

•Audible indicators for such conditions as out-of-range, low

battery, and sending- and receiving-sensitivity changes

•Encryption in compliance with USA regulation

45 CFR 164.312(a)(2)(iv), and therefore compliance with the

Health Insurance Portability and Accountability Act (HIPAA).

Revision: C CA12CD Product Summary.doc 5 of 12 pages

Figure 1: Model CA12CD

2.2 Functional Description1

The CA12CD is a cordless push-to-talk (PTT) headset adaptor

made to provide wireless communications and PTT functionality

for Public Safety Dispatch and Air Traffic Control facilities (see

Figure 1). The CA12CD has a Quick Disconnect and is compatible

with all Plantronics H-Series headsets.2The CA12CD consists of a

base unit and a remote unit.

The base has two charging wells, sending- and receiving-sensitivity

controls, status LEDs and a 10-foot coil cord with a PJ-7 connector.

The charging wells accommodate the remote and a spare battery

pack. The LEDs show battery-charge status, power, and PTT status.

The sending controls consist of a configuration switch to emulate

1Unless otherwise specified, all references to the CA12CD also apply to the CA12CD/A and its

variants.

2Examples of H-Series headsets commonly used in air-traffic control and public-safety dispatch

are the H31 StarSet®, H251 SupraPlus®, H171 DuoPro®, and H91 Encore®, along with the noise-

canceling versions of these headsets. Binaural versions of some of these headsets are also

available. Please see the Plantronics website for further information.

AC Adaptor

(North-

American

version)

Console

Interface

Cable

Remote

are Batter

Base

-7 Connector

Quick

Disconnect

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the outputs of different microphone types and a sending-sensitivity

fine-adjust control. The receiving-sensitivity control selects among

four different sensitivity ranges, and the receiving sensitivity can be

fine-tuned by a control on the remote. The console interface cable

connects to the base via a 6-pin modular connector and is typically

wired on the console end with sending on the PJ-7 tips, receiving

on the sleeves, and PTT on the rings. When the user presses the

PTT switch on the remote unit, a relay is closed in the base that

places a short circuit across the PJ-7 rings. This short circuit “keys

up” the communications console to which the CA12CD is

connected and allows the user to transmit over the communications

radio.

The remote unit has a PTT switch, an On-Off switch with

incorporated LED, a metal belt clip, a receiving-sensitivity

fine-adjust control, and a twelve-inch cable terminated in a Quick

Disconnect to which any Plantronics H-Series headset can be

connected.

The On-Off switch enables audio and PTT. As long as the base is

powered up, the RF link is maintained regardless of whether

audio/PTT is enabled. Even when the base is powered down, the

remote will continue to run so that the link can be reestablished

should the base be turned on again. Therefore, to completely

power-down the remote unit, it is necessary to remove the battery.

The CA12CD/A and its variants operate in the European DECT

band of 1880 to 1900 MHz.

The CA12CD for North America also uses DECT technology, but it

operates in the Unlicensed Personal Communications Services

(UPCS) 1920- to 1930-MHz band.

The DECT protocol is used for its power efficiency, which allows

extended operation from a relatively small battery pack. A new,

freshly-charged battery will provide about eight hours of talk time.

Revision: C CA12CD Product Summary.doc 7 of 12 pages

2.3 Product Architecture

2.3.1 Base Unit

The block diagram of the Model CA12CD base is shown in Figure

Figure 2: Base-Unit Block Diagram

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2.3.2 Remote Unit

The block diagram of the remote unit is shown in Figure 3.

Figure 3: Remote-Unit Block Diagram

3Audio Performance

The CA12CD audio processing is 32k ADPCM, telephony

bandwidth. A wide range of audio levels can be achieved using the

coarse-adjust and fine-adjust controls provided for both the

transmit and the receive channels. See the User Guide and the

Audio-Level Settings card (both available online) for details on

optimizing these controls for the best audio performance.

3.1 Sidetone

For some installations the user may hear distorted sidetone: They

hear their own voice in the headset as they speak, and it sounds

harsh or rattley. Following the steps outlined on the audio-level

settings card should help the user to avoid this problem. The

On/Off

Revision: C CA12CD Product Summary.doc 9 of 12 pages

general procedure for avoiding sidetone problems is to avoid

unnecessarily-high transmit-volume levels and to keep the sidetone

controls on the installation—if present—set to their minimum

positions. The sidetone controls may be user-accessible, or they

may be accessible only to service personnel.

The reason for minimizing sidetone from the customer equipment

is due to the delay introduced by the digital architecture (TDMA3)

of the DECT radio link. Sidetone generated in the customer

equipment is delayed by about 20 mS by the time it reaches the

user’s ears. This is enough of a delay to be unpleasant to the user.

Under normal conditions, a local echo canceller in the base stops

sidetone and network-generated echoes from reaching the user, but

if the transmit signal is too high, or if there is non-linear processing

in the sidetone path, sidetone breakthrough will occur, and the user

will hear the distorted audio described above. A sidetone generator

in the remote replaces the sidetone that has been removed by the

local echo canceller.

3.2 Interference

The CA12CD shares its frequency band with other radio products.

Sometimes interference occurs due to other products using the

same band. Interference may result in buzzing or pops in the talk or

listen audio, or irregular mutes of the talk or listen audio, or may

result in shortened range. The following steps may improve the

performance of a CA12CD that is experiencing interference:

•Repositioning the base

•Limiting the distance between the base and the headset

while in use

•Repositioning the interference source, if known

If the CA12CD base or remote is placed within a few inches of a

cellular phone, the CA12CD may experience interference.

Reposition the cellular phone or the CA12CD base or remote to

increase the separation if this problem occurs.

4Range and User Density

Range is as much as 100 feet. The effective limit to range is set by

the onset of audio artifacts as the user gets further away from the

base. Range can be reduced within a building by the obstruction of

interior walls, or by the presence of other equipment operating in

3Time Division Multiple Access

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the CA12CD’s frequency band, or by the presence of a large

number of other CA12CDs in the immediate area.

Range can be maximized by taking the following steps:

•Maximizing the amount of separation between the CA12CDs

•Placing the CA12CDs so that they are separated by items

such as cubicle walls and furniture

•Turning off all unused bases (and removing the batteries

from the remotes to prevent them from discharging)

•Insuring that no other equipment is operating in the same

frequency band as the CA12CD: Interference may come from

systems well outside the coverage area, as the range for

interference is greater than the coverage range

As a general guideline, maximum range will probably be realized

in a low-density installation of 5 units separated from each other by

at least 10 feet. In a high-density installation of 30 units at 18-inch

spacing, the range could be as little as 10 feet. The worst case for

these coverage limits will occur when a user is distant from their

own base but close to other bases or remotes.

In a high-density installation the CA12CD may take some time to

reestablish connectivity with its base when the user returns to the

coverage area after having been out of range. It normally takes a

few seconds for the remote to find the base’s signal as the user

reenters the coverage area, but this process can take a minute or so

in a high-density installation.

Regardless of the installation’s density, if the user has been out of

range for more than 10 minutes, the link will not be automatically

reestablished: In this case, the user will have to press the On/Off

button on the remote unit to reestablish the link.

Predicting the effective range and region of susceptibility to

interference for individual environments and building layouts is of

sufficient complexity as to be beyond the scope of this discussion.

The preceding information is provided as a reference for system

planning, and the performance of individual installations may

vary.

5Voice Privacy

The CA12CD provides excellent security against eavesdropping.

This security is achieved through frequency hopping and

encryption.

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