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NW6005 Datenblatt(Datasheet) 4 Page - Integrated Device Technology

Teile-Nr. NW6005
Beschreibung  ENHANCED TYPE II CALLER ID DECODER
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Hersteller  IDT [Integrated Device Technology]
Homepage  http://www.idt.com
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INDUSTRIAL TEMPERATURE RANGE
NW6005 ENHANCED TYPE II CALLER ID DECODER
BRITISH TELECOM
BT SIN227 and SIN242 define the signal interface between the
Central Office (CO) and the Terminal Equipment (TE) for the Caller
Display Service (CDS). CDS provides CLIP (Calling Line Identity
Presentation) that delivers to an idle state (on hook) TE the identity of
an incoming caller before the first ring.
A polarity reversal on the A and B wires indicates the arrival of a
CDS call. After that comes an Idle State Tone Alert Signal, and then
Caller ID FSK information transmitted in ITU-T V.23 format. When the
subscriber is engaged in a call, the arrival of information about
another incoming call is indicated by a Loop State Tone Alert Signal.
The NW6005 can detect tone alert signal and demodulate the
incoming ITU-T V.23 FSK signals.
ETSI
The ETSI caller identity specifications ETS 300 788-1 for on-hook
and ETS 300 788-2 for off-hook define the requirements for CPE,
while ETS 300 659-1 for on-hook and ETS 300 659-2 for off-hook
define the end office requirements. The services such as CLIP and
CLIP with Call Waiting in ETSI specifications are similar to those of
Bellcore. The ETSI specifications are popularly used in Europe.
FUNCTIONAL DESCRIPTION
CALLER ID SPECS SUPPORTED
The NW6005 is a type II Caller ID device with Call Waiting
capability. It supports Bellcore, BT and ETSI specifications. The major
differences between above specs are as follows (see Fig. 11, Fig. 12
and Fig. 13 for reference):
BELLCORE AND TIA
Bellcore GR-30-CORE and SR-TSV-002476 define the
requirement for the signalling services of Calling Number Delivery
(CND), Calling Name Delivery (CNAM), VMWI (Visual Message
Waiting Indicator) and Calling Identity Delivery on Call Waiting
(CIDCW).
In CND or CNAM service, information of the calling party is
embedded in the silent interval between the first and second ringing.
The NW6005 can detect and demodulate the incoming Bell-202 FSK
data. In CIDCW service, information about an incoming caller is sent
to the subscriber who is engaged in another call. A CPE Alerting
Signal (CAS) indicates that a CIDCW data is incoming. The NW6005
can detect the alerting signal and demodulate the incoming FSK
information which contains CIDCW data. The demodulated data is
output onto the serial interface.
In North America, Telecommunications Industry Association (TIA)
also defines standards. TIA specification TIA/EIA-716 defines Type I
CPE requirements. A type II CPE specification document is drafted as
TIA/EIA-777. FSK characteristics in TIA specifications differ from those
Bellcore published in its specifications.
Pin
Name
Description
CB0
FSK Data Interface
Mode Select
0
1
FSK Data Interface Mode 0: FSK bit stream is output directly.
FSK Data Interface Mode 1: FSK byte is stored in a 1-byte buffer, which can be read
serially by the microcontroller.
CB1
CB2
Function Select 1
Function Select 0
CB1
1
1
0
0
CB2
1
0
1
0
FSK Demodulation is enabled. Tip/Ring input (GS1) is selected. In FSK Mode 1
operation (CB0 = ‘1’), DR/STD is DR.
Hybrid DT-AS Detection is enabled. Hybrid Receive input (GS2) is selected. DR/STD is
STD.
Tip/Ring DT-AS Detection is enabled. Tip/Ring input (GS1) is selected. DR/STD is
STD. Tip/Ring DT-AS detection is required for Bellcore MEI and BT on-hook CLIP.
When CB0 is high (‘1’): the NW6005 will be powered down. It draws minimal power
supply current.
When CB0 is low (‘0’): for factory testing only.
Table 1. Description of Control Bit Pins CB0-2
PIN INFORMATION (CONTINUED)




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