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參數(shù)資料
| 型號： | MT88E41 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Extended Voltage Calling Number Identification Circuit (ECNIC)(擴展電壓主叫識別電路（提供各種主叫線信息傳遞設備的接口）) |
| 中文描述： | 擴展電壓主叫號碼識別電路（ECNIC）（擴展電壓主叫識別電路（提供各種主叫線信息傳遞設備的接口）） |
| 文件頁數(shù)： | 3/15頁 |
| 文件大小： | 99K |
| 代理商： | MT88E41 |
MT88E41
5-23
Functional Description
The MT88E41 Extended Voltage Calling Number
Identification Circuit (ECNIC) is a device compatible
with the Bellcore proposal (GR-30-CORE) on
generic requirements for transmitting asynchronous
voiceband data to Customer Premises Equipment
(CPE) from a serving Stored Program Controlled
Switching System (SPCS) or a Central Office (CO).
This data transmission technique is applicable in a
variety of services like Calling Number Delivery
(CND), Calling Name Delivery (CNAM) or Calling
Identity Delivery on Call Waiting (CIDCW) as
specified in Custom Local Area Signalling Service
(CLASS
SM
) calling information delivery features by
Bellcore.
With CND, CNAM and CIDCW service, the called
subscriber has the capability to display or to store
the information on the calling party which is sent by
the CO and received by the ECNIC.
In the CND service, information about a calling party
is embedded in the silent interval between the first
and second ring. During this period, the ECNIC
receives and demodulates the 1200 baud FSK signal
(compatible with Bell-202 specification) and outputs
data into a 3-wire serial interface.
In the CIDCW service, information about a second
calling party is sent to the subscriber, (while the
subscriber is engaged in another call). During this
period, the ECNIC receives and demodulates the
FSK signal as in the CND case.
The ECNIC is designed to provide the data
transmission interface required for the above service
Figure 3 - Differential Input Configuration
Figure 4 - Single-Ended Input Configuration
at the called subscriber location either in the on-hook
case as in CND, or the off-hook case, as in CIDCW.
The functional block diagram of the ECNIC is shown
in Figure 1. Note however, for CIDCW applications, a
separate CAS (CPE Alerting Signal) detector is
required.
In Europe, Caller ID and CIDCW services are being
proposed. These schemes may be different from
their North American counterparts. In most cases,
1200 baud CCITT V.23 FSK is used instead of Bell
202. Because the ECNIC can also demodulate 1200
baud CCITT V.23 with the same performance, it is
suitable for these applications.
Although the main application of the ECNIC is to
support CND and CIDCW service, it may also be
used in any application where 1200 baud Bell 202
and/or CCITT V.23 FSK data reception is required.
Input Configuration
The input arrangement of the MT88E41 provides an
operational amplifier, as well as a bias source (V
Ref
)
which is used to bias the inputs at V
DD/2
. Provision is
made for connection of a feedback resistor to the op-
amp output (GS) for adjustment of gain. In a single-
ended configuration, the input pins are connected as
shown in Figure 4.
Figure 3 shows the necessary connections for a
differential input configuration.
User Interface
The ECNIC provides a powerful 3-pin interface which
can reduce the external hardware and software
requirements. The ECNIC receives the FSK signal,
demodulates it, and outputs the extracted data to the
DATA pin. For each received stop bit start bit
sequence, the ECNIC outputs a fixed frequency
clock string of 8 pulses at the DCLK pin. Each clock
C1
R1
C2
R4
R3
R2
R5
IN+
IN-
GS
V
Ref
MT88E41
DIFFERENTIAL INPUT AMPLIFIER
C1 = C2 = 10 nF
R1 = R4 = R5 = 100 k
R2 = 60k
, R3 = 37.5 k
R3 = (R2R5) / (R2 + R5)
VOLTAGE GAIN
(A
V
diff) = R5/R1
INPUT IMPEDANCE
(Z
IN
diff) = 2
R1
2
+ (1/
ω
C)
2
C
R
IN
IN+
IN-
GS
V
Ref
MT88E41
VOLTAGE GAIN
(A
V
) = R
F
/ R
IN
R
F
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