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參數(shù)資料
| 型號： | MH89792-3 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | E1 Transceiver Preliminary Information |
| 中文描述： | E1收發(fā)器的初步信息 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大小： | 67K |
| 代理商： | MH89792-3 |
Preliminary Information
MH89792
4-225
14
TLA
Transmit Line B (Output).
The B wire of Ring connection of the E1 receive line should be
connected to this pin.
15
TLB
Transmit Line B (Output).
The B wire or Tip connection of the E1 receive line should be
connected to this pin.
16
NC
No Connection.
This pin is not fitted.
17
NC
No Connection.
This pin is not fitted.
18
NC
No Connection.
This pin is not fitted.
19
TXA
Transmit A (Input).
A unipolar signal from the framer device used in conjunction with TxB
is used to generate the bipolar output signal.
20
TXB
Transmit B (Input).
A unipolar signal from the framer device used in conjunction with TxA
is used to generate the bipolar output signal.
Pin Description (Continued)
Pin #
Name
Description
Functional Description
The MH89792 is a 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 receive circuitry, inductorless clock
recovery, data and clock polarity selection and loss
of signal indication.
Bipolar Line Receiver
The MH89792 receiver interfaces to the transmission
line through an internal pulse transformer which
splits the received AMI lines signal into RxA and
RxB. These two signals are combined by internal
logic to form a new signal which represents the
received data, RxD. The signals RxA and RxB may
be inverted where required by applying a logic low
signal permanently to pin 7, (RxINV). RxD will not be
affected by use of this pin.
The input impedance seen by the transmission line is
about 120 ohms when using the -1 variant for twisted
pair applications, about 75 ohms when using the -2
variant for coaxial cable applications, and is about
100 ohms when using the -3 variant for digital
twisted pair applications.
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.
MH89792
transmitter
line
through
interfaces
an
internal
to
the
pulse
Clock Extractor
The MH89792 contains a clock extraction circuit
which 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 and
can be configured as either rising or falling edge by
the use of pin 8. (CLKF/CLKR).
Loss of Signal
The circuitry on the MH89792 is capable of detecting
128 continuous ZEROs received on RLA and RLB
and indicating this condition as a logic low on pin 9,
(LOS). When LOS and RxINV are low RxA and RxB
are forced high, when LOS is low and RxINV is high
RxA and RxB are forced low LOS will not reset until
64 ONEs are received in a two E1 frame period. LOS
may be inverted by applying a logic low to pin 10,
(LOSP).
相關PDF資料 |
PDF描述 |
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| MH89793 | E1 Transceiver with Selectable Impedance Preliminary Information |
| MH89793 | E1 Line Interface Unit (LIU) with Selectable Impedance(帶可選阻抗的E1線接口單元（LIU）) |
| MH8D64AKQC-10 | JT 55C 55#20 SKT PLUG |
| MH8D64AKQC-75 | Circular Connector; No. of Contacts:21; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:22; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:22-21 RoHS Compliant: No |
| MH8V7245BAZTJ-5 | Circular Connector; No. of Contacts:5; Series:; Body Material:Aluminum; Connecting Termination:Solder; Connector Shell Size:14; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:14-5 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MH89793 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:E1 Transceiver with Selectable Impedance Preliminary Information |
| MH897931 | 制造商:Microsemi Corporation 功能描述: |
| MH-8AF | 制造商:TE Connectivity 功能描述: |
| MH-8C | 功能描述:通用繼電器 RELAY VACUUM SPST RoHS:否 制造商:Omron Electronics 觸點形式:1 Form A (SPST-NO) 觸點電流額定值:150 A 線圈電壓:24 VDC 線圈電阻:144 Ohms 線圈電流:167 mA 切換電壓:400 V 安裝風格:Chassis 觸點材料: |
| MH-8CF | 功能描述:通用繼電器 RELAY VACUUM SPDT RoHS:否 制造商:Omron Electronics 觸點形式:1 Form A (SPST-NO) 觸點電流額定值:150 A 線圈電壓:24 VDC 線圈電阻:144 Ohms 線圈電流:167 mA 切換電壓:400 V 安裝風格:Chassis 觸點材料: |
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