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參數(shù)資料
| 型號(hào)： | MH89790BS |
| 廠商： | Mitel Networks Corporation |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 中文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 文件頁(yè)數(shù)： | 15/32頁(yè) |
| 文件大?。?/td> | 488K |
| 代理商： | MH89790BS |
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4-201
Preliminary Information
MH89790B
framer, but is independent of the multiframe
synchronization. The CRC framer will not initiate a
search for CRC framing signal until frame alignment
synchronization is achieved. Once frame alignment
synchronization is acquired, the CRC framer must
find two framing signals in bit 1 of the non-frame
alignment signal. Upon detection of the second CRC
framing signal the MH89790B will immediately go
into CRC synchronization. When maintenance
feature is enabled (maint bit = 1) the CRC framer will
force a complete reframe of the device if CRC frame
synchronization is not found within 8 ms or more
than 914 CRC errors occur per second.
Bipolar Line Receiver
The
transmission line through a pulse transformer which
splits the received AMI line signal into RxA and
RxB. These two signals are combined by an
internal NAND gate to form a new signal, which
represents received data. The received data is
clocked into the chip on the falling edge of E2o.
Figure 28 shows the functional timing of the bipolar
receiver.
MH89790B
receiver
interfaces
to
the
Input impedance seen by the transmission line is
about 75 ohms, (transformer ratio 1:1:1 with
center-tap grounded) as required by G.703 for
coaxial cable. Attenuation of the transmission line
shall not exceed 6dB (at 1024 kHz) and attenuation
characteristics shall be close to the “square root of
F”.
AF [dB] = AF
ref
[dB] *
where:
AF
-
attenuation at frequency f in dB
AF
ref
- attenuation at frequency f
ref
in dB (in this
case 6 dB)
f
ref
-
reference frequency (in this case 1024
kHz)
f
-
frequency in kHz
Input jitter tolerance of the MH89790B exceeds
minimum jitter tolerance as specified in CCITT I.431
and G.823 (see Figure 13).
f
f
ref
Figure 12 - Synchronization State Diagram
out of
synchronization
search for frame
alignment
signal
verify bit 2 of non-
frame alignment
signal
verify second
occurrence of frame
alignment signal
find two CRC
frame alignment
signals
CRC synchronization
acquired
search for
multiframe align-
ment signal
multiframe synchro-
nization acquired
check for two errored
multiframe alignment
signals
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
# of consecutive incorrect
frame alignment signals = 3
time out > 8ms
No
- - - - - Only if the
maintenance
option is
selected
No
number of CRC
errors > 914/s
frame synchroni-
zation acquired
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MH89791 | CEPT PCM 30 Transmit Equalizer Advance Information |
| MH89792-1 | E1 Transceiver Preliminary Information |
| MH89792 | E1 Transceiver Preliminary Information |
| MH89792-2 | E1 Transceiver Preliminary Information |
| MH89792-3 | E1 Transceiver Preliminary Information |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MH89791 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CEPT PCM 30 Transmit Equalizer Advance Information |
| MH89792 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:E1 Transceiver Preliminary Information |
| MH89792-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:E1 Transceiver Preliminary Information |
| MH89792-2 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:E1 Transceiver Preliminary Information |
| MH89792-3 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:E1 Transceiver Preliminary Information |
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