Plantronics CA12CD Manuale utente

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

Product Summary, CA12CD Cordless

Push-to-Talk Adaptor

2 of 13 pages CA12CD Product Summary Revision: E

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

D 7-Jun-11 Update with new logo only

E 16-Dec-11 Revise Figure 1

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: E CA12CD Product Summary 3 of 13 pages

1.3 Table of Contents

Titles Page No.

1Document Information 2

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

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

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

1.4Table of Figures.............................................................................3

2Product Description 5

2.1Summary of Features....................................................................5

2.2Functional Description .................................................................6

2.3Product Architecture ....................................................................8

2.3.1Base Unit.............................................................................8

2.3.2Remote Unit .......................................................................9

3Audio Performance 9

3.1Sidetone ..........................................................................................9

3.2Interference ..................................................................................10

4Range and User Density 10

5Voice Privacy 12

5.1Frequency Hopping....................................................................12

5.2Encryption....................................................................................12

6Subscription 13

1.4 Table of Figures

Titles Page No.

Figures:

Figure 1: Model CA12CD.........................................................................6

Figure 2: Base-Unit Block Diagram ........................................................8

Figure 3: Remote-Unit Block Diagram...................................................9

4 of 13 pages CA12CD Product Summary Revision: E

Revision: E CA12CD Product Summary 5 of 13 pages

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).

6 of 13 pages CA12CD Product Summary Revision: E

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

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® and the HW251 SupraPlus®, 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.

Console

Interface

Cable

Remote

are Batter

Base

-7 Connector

Quick

Disconnect

Revision: E CA12CD Product Summary 7 of 13 pages

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

The sending controls consist of a configuration switch to emulate

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.

8 of 13 pages CA12CD Product Summary Revision: E

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

Revision: E CA12CD Product Summary 9 of 13 pages

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

On/Off

10 of 13 pages CA12CD Product Summary Revision: E

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

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

3Time Division Multiple Access

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