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參數(shù)資料
| 型號： | MH89770N |
| 廠商： | Mitel Networks Corporation |
| 元件分類： | 通信及網絡 |
| 英文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 中文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 文件頁數(shù)： | 20/36頁 |
| 文件大?。?/td> | 836K |
| 代理商： | MH89770N |
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4-144
MH89770
Preliminary Information
Figure 13 - PCM/Voice Data Channel Bank
Switch Matrix
T1 Interface
Equal-
izer
12.352
MHz Osc.
16.384
MHz Osc.
MT8941
DPLL#1
CVb
F0i
C12i
DPLL#2
F0b
C4b
C2o
C8Kb
C16i
MH89770
DSTi
DSTo
CSTi0
CSTo
CSTi1
C2i
F0i
C1.5i
OUTA
OUTB
RxT
RxR
E8Ko
μ
P
MT8980
STo0
STi0
STo3
STi3
F0i
C4i
STo1
STi1
STo2
STi2
STo4
C1.5i
C2i
C4i
F0i
Shift
Reg.
MT8870
STD
MT8964
MT8870
STD
MT8964
Shift
Reg.
CTLo
OFHK
MUX
Signalling Interface
Analog Line Interface
SLIC #1
CTLi
OFHK
#1
D3
Do
#1
#N
Do
D3
#N
PCMi
PCMi
PCMo
T
R
T
R
SLIC #24
Figure 13 shows a block diagram of a channel bank
that has been divided into four sections, the analog
line interface, signalling interface, switch
matrix, and
T1 interface. The subscriber line interface circuit
(SLIC) provides interface to the telephone line, i.e.,
provides loop current and ringing voltage, and
converts the analog voice signal into μ
-
Law PCM.
The SLIC also detects the off-hook condition for
conventional POTS (Plain Old Telephone Set)
signalling.
Once the voice is encoded into digital format the
switch matrix transfers the 24 consecutive channels
that are received from the SLICs to the 24 valid
channels used by the MH89770. The MH89770
formats and transmits this information on the T1 line.
Signalling information from the telephone sets can
be routed straight through to the output T1 channel,
or it can be routed to the DTMF receiver pool. This is
easily accomplished by the MT8980 switch matrix
once the SLIC has digitized the analog signal.
Channel banks must be able to operate in a loop
timed
mode
so
that they
synchronization requirements of a level four entity.
Phase-locked loop #2 of the MT8941 generates the
ST-BUS clocks that are synchronized to the
extracted 8kHz clock, and phase-locked loop #1
generates the transmit T1 clock synchronized to the
ST-BUS.
meet
the clock
4. ISDN Voice/Data Channel Bank/Concentrator
The ISDN channel bank is a term that is used in this
context to describe a system that performs the same
logical function as the D3/D4 channel bank. That is,
it concentrates the subscribers digital loop into the
primary digital transmission scheme, the T1 trunk.
相關PDF資料 |
PDF描述 |
|---|---|
| MH89770 | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MH89770S | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MH89790B | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MH89790BN | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MH89790BS | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MH89770S | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:T1/ESF Framer & Interface Preliminary Information |
| MH89790B | 制造商:MITEL 功能描述: 制造商:ZARLNK 功能描述: |
| MH89790BN | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ST-BUS⑩ FAMILY CEPT PCM 30/CRC-4 Framer & Interface Preliminary Information |
| MH89790BS | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ST-BUS⑩ FAMILY CEPT PCM 30/CRC-4 Framer & Interface Preliminary Information |
| MH89791 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CEPT PCM 30 Transmit Equalizer Advance Information |
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