MT88E45 データシートの表示（PDF） - Mitel Networks

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MT88E45

4-Wire Calling Number Identification Circuit 2 (4-Wire CNIC2)

Mitel Networks 

Advance Information

MT88E45

Parameter

North America: Bellcorea

Europe: ETSIb

UK: BTc

Mark (Logical 1) Frequency

1200 Hz +/- 1%

1300 Hz +/- 1.5%

Space (Logical 0) Frequency

Received Signal Level

Signal Reject Level

Transmission Rate

Twist (VMARK/VSPACE)

Signal to Noise Ratio

Tip/Ring Op-Amp (GS1) Gain

Vdd = 5V +/- 10%

Tip/Ring Op-Amp (GS1) Gain

Vdd = 3V +/- 10%

2200 Hz +/- 1%

-4.23 to -36.20 dBm

(476 to 12 mVrms)d

-48.24 dBm (3mVrms) for

On-hook No Ring Signalling

such as VMWI

1200 baud +/- 1%

-6 to +10 dB

Single Tone (f):

-18 dB (f<=60Hz)

-12 dB (60<f<=120Hz)

-6 dB (120<f<=200Hz)

+25 dB (200<f<3200Hz)

+6 dB (f>=3200Hz)

0 dB

-3.5 dB

2100 Hz +/- 1.5%

-5.78 to -33.78 dBme -5.78 to -37.78 dBm

(-8 to -36 dBV)f,g

(-8 to -40 dBV)

On-hook: -47.78 dBm

(-50dBV)

1200 baud +/- 1%

-6 to +6 dB

>= 25 dB

(300 to 3400 Hz)

>= 20 dB

(300 to 3400 Hz)

-2 dBh

-5.5 dBi

0 dB

TBD

a. ANSI/TIA/EIA-716 and draft TIA/EIA-777. Bellcore has agreed to the values and will synchronize its requirements.

b. ETS 300 778-1 (On-hook) Sep 97, ETS 300 778-2 (Off-hook) Jan 98.

c. SIN 227 Issue 3 Nov 97, SIN242 Issue 2 Nov 96.

d. North American on-hook signalling range. The off-hook range is inside the on-hook range: 190mVrms to 12mVrms.

e. dBm - Decibels above or below a reference power of 1 mW into 600 ohms. 0 dBm = 0.7746 Vrms

f. dBV - Decibels above or below a reference voltage of 1 Vrms. 0 dBV = 1 Vrms.

g. ETSI on-hook signalling range. The off-Hook signalling levels are inside this range: -8.78 to -30.78 dBm (-11 to -33 dBV).

h. The 5V ETSI Tip/Ring op-amp gain can be 0 dB if there is no FSK reject level requirement.

i. The 3V ETSI Tip/Ring op-amp gain can be -3.5dB if there is no FSK reject level requirement.

Table 4 - FSK Signal Characteristics

FSK Demodulation

The FSK characteristics are shown in Table 4. In

North America, TIA (Telecommunications Industry

Association) also defines standards. The Type 1

Caller ID CPE standard is ANSI/TIA/EIA-716. The

Type 2 standard is being drafted to become TIA/EIA-

777. The North American FSK characteristics in

Table 4 are from ANSI/TIA/EIA-716. They differ from

those Bellcore published in SR-TSV-002476 and SR-

3004. Bellcore is represented in TR41.3.1 and will

synchronize to the TIA requirements in its future

documents.

The TIA Type 1 standard includes an FSK reject

level:

• if data is not preceded by ringing (e.g. VMWI),

FSK signals below 3mVrms (-48.24 dBm) shall

be rejected

• if data is preceded by ringing, FSK detection

may be extended below 3mVrms

The MT88E45 is compliant with the Bellcore/TIA,

ETSI and BT requirements with the Tip/Ring op-amp

gains in Table 4. In Europe if the country specific

FSK requirements do not incorporate ETSI’s FSK

reject level then the Tip/Ring op-amp gain can also

be 0dB at 5V and -3.5dB at 3V to meet the ETSI

minimum CAS level for on-hook signalling (-40 dBV).

For 3V operation, the FSK receiver becomes more

sensitive and lower level signals will be accepted

than at 5V. To maintain the FSK reject level, the Tip/

Ring input op-amp gain should be reduced. Note that

since the Tip/Ring op-amp is also used for Tip/Ring

CAS detection, the CAS level will also be reduced for

on-hook detection.

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