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參數(shù)資料
| 型號(hào)： | MH89793 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | E1 Transceiver with Selectable Impedance Preliminary Information |
| 中文描述： | E1收發(fā)器具有可選的阻抗的初步信息 |
| 文件頁(yè)數(shù)： | 3/8頁(yè) |
| 文件大?。?/td> | 70K |
| 代理商： | MH89793 |
4-231
Preliminary Information
MH89793
16
TXB
Transmit B (Input).
A unipolar signal from the framer device used in conjunction with TXA
is used to generate the bipolar output signal.
17
NC
No Connection.
This pin is used for internal connection.
18
NC
No Connection.
This pin is used for internal connection.
19
NC
No Connection.
This pin is used for internal connection.
20
VDD
D.C. Power (Input).
+5V supply.
21
E2o
2048kHz Extraction Clock (Output).
This clock is extracted by the device from the
received signal. It is used internally to clock in data received from RLA and RLB.
22
RXB
Receive B (Output).
This pin is connected to the negative receive pin of the framer and
provides a signal of the same format as RXA.
23
RXA
Receiver A (Output).
The bipolar CEPT signal received by the device at RLA and RLB
input is converted to a unipolar format and output at this pin. This pin is connected to the
positive receive pin of the framer.
24
VSS
Ground (Input).
D.C. power return path.
25
LOS
Loss of Signal (Output).
This pin goes low when 128 contiguous zeros are received on
the RLA and RLB inputs. LOS is reset when 64 ones are received in dual E1 frame periods.
26
NC
No Connection.
This pin is used for internal connection.
27
RZA
Receive Impedance Select.
This pin is connected to pin 17 RZB to select 75
input
impedance. For 120
operation this pin is left open circuit.
Receive Impedance Select.
This pin is connected to pin 16 RZA to select 75
input
impedance. For 120
operation this pin is left open circuit.
28
RZB
Pin Description (Continued)
Pin #
Name
Description
Functional Description
The MH89793 is an E1 digital trunk interface which
when used with an approved framer will conform to
CCITT recommendation G.703 for PCM30 and I.431
for the ISDN. The functions provided include line
driver and receiver circuitry, inductorless clock
recovery, and loss of signal indication.
Bipolar Line Receiver
The MH89793 receiver interfaces to the transmission
line through an internal pulse transformer which
splits the received AMI lines signal into RxA and
RxB. The line impedance is selected by linking
appropriate option pins.
Attenuation of the transmission line shall not exceed
6dB (at 1024kHz) and attenuation characteristics
shall be close to the “square root of f”.
Af (dB) = AF
ref
(dB)*
√
f
f
ref
Where:
AF - attenuation at frequency f in dB
AF
ref
- attenuation at frequency f
ref
in dB (in kHz)
f
ref
- reference frequency (in this case 1024) kHz
f - frequency in kHz
Bipolar Line Transmitter
The
transmission
transformer which combines the TxA and TxB data
into an AMI line coded signal. This is then passed
through the 6dB pad prior to being applied to the
line.
MH89793
transmitter
line
through
interfaces
an
internal
to
the
pulse
Clock Extractor
The MH89793 contains a clock extraction circuit that
generates the E2o clock from the received data
without the use of external crystals or a tunable
inductor.
The edge of the E2o extracted clock approximately
aligns with the centre of the received data pulse.
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