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PDF XE0020 Data sheet ( Hoja de datos )
| Número de pieza | XE0020 | |
| Descripción | Telephone Line Interface | |
| Fabricantes | Xecom | |
| Logotipo |  |
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XE0020 and XE0020C
8/97
Telephone Line Interface with Active Line Monitoring
Description
The XE0020 and XE0020C are complete compact
telephone interface modules. As with all Xecom
DAAs the XE0020 and XE0020C include Ring
Detection, Switch-Hook, and Loop Current
Holding Circuits. In addition both the XE0020 and
XE0020C include two line monitors to insure
unobtrusive customer premises operation. The
XE0020C also passes the Caller ID signal through
to the system host.
Xecom designed the XE0020 and XE0020C for
unobtrusive operation in residential applications.
Two integral line monitors prevent interference
with the residents calls.
Connect Detect verifies line availability before the
equipment seizes the line. This will prevent the
equipment from interrupting a residents call.
Handset Interrupt signals the system host to
drop the call in progress when the resident picks-
up an extension phone. This feature permits the
resident to interrupt the call in case of emergency.
Caller ID permits the host to
identify incoming calls and
answer only those from
designated call centers.
T1
Together these features give
residents priority use of the
telephone line without shutting
out the equipment.
Line
T2 Transformer
OH
RI
HInt
CD
Features
* Small Size: 2.0" by 0.5" by 0.4" thick;
* Supports data transfer at 33,600 bps;
* FCC Part 68 Compliant;
* Ring Detection;
* Continuous Connect Detect Monitor;
* Handset Interrupt Monitor
* Single +5 Volt Power Supply;
* Hookswitch Control
* Caller ID Signal Path (XE0020C)
Models
XE0020: includes ring detect , hookswitch,
Handset Interrupt, Connect Detect, telephone
line transformer, loop current holding circuit;
XE0020C: XE0020 features plus Caller ID signal
pass through;
Block Diagram
Caller ID
(optional)
Loop
Current
Holding
Circuit
Hook-
Switch
Ring
Detect
TIP
RING
Line
Voltage
Monitor
XECOM
XE0020
1 page  
Telephone Line Connection Information
When developing a product to be connected to the telephone line, it is necessary to use a circuit described as a
Data Access Arrangement (DAA) which is approved by the appropriate governmental agency. In the US, for
example, this agency is the Federal Communications Commission (FCC), while in Canada it is Industry Canada.
These agencies test and approve the product to ensure that it meets their specifications, thereby protecting the
telephone system from damage and protecting the user from high voltage transients (such as lightning strikes) which
may come down the telephone line.
The XE0020 has been designed to meet FCC Part 68 requirements for hazardous voltage, surge protection and
leakage current. If the system transmits data, or DTMF tones on the telephone line, the user must certify that these
transmitted signals meet FCC requirements for maximum transmission levels of out of band energy and billing delay.
Full details may be obtained from the FCC under Part 68 of the FCC Rules and Regulations, or in Title 47 of the
Code of Federal Regulations, however the basic requirements are as follows:
1. Maximum Transmit Level
For the normal “permissive” (standard) telephone line, equipment which transmits data (such as a modem) must not
exceed a transmission level of -9 dBm.
2. Out of Band Energy
Data equipment must not transmit “out of band” energy on the telephone line which exceeds the following limits:
Frequency
Range Max. Power
200Hz
to 3990Hz -9 dBm
3990Hz to 4005Hz -27 dBm
4005Hz to 16kHz -16 dBm
8kHz
to 94kHz -47 dBm
86kHz
to 270kHz -46 dBm
270kHz to 6MHz
-6 dBm
3. DTMF Transmission Level
If the system is capable of DTMF dialing, the maximum DTMF transmission level must be less than 0 dBm averaged
over a 3 second interval.
4. Billing Delay
A delay of 2 seconds or greater is required after the time the XE0020 is taken “off hook” and before any information
is transmitted. This is required to ensure that billing information may be exchanged between telephone company
central offices without interference.
The user of the XE0020 must certify to the FCC that the final system meets the requirements of Part 68 which
include the criteria above as well as the high voltage isolation provided by the XE0020. This is generally
accomplished through an independent testing lab which test the System and submits the proper paperwork to the
FCC for approval. Since the XE0020 already complies with FCC Part 68 rules, this is a relatively simple process.
XECOM (5) XE0020
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet XE0020.PDF ] | |
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