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參數(shù)資料
| 型號： | MH89760B |
| 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 |
| 文件頁數(shù)： | 19/38頁 |
| 文件大?。?/td> | 846K |
| 代理商： | MH89760B |
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4-73
Preliminary Information
MH89760B
Figure 12 - Using the MH89760B in a Parallel Bus Environment
MH89760B
MT8920B
(Mode 2)
D
0
-D
7
A
0
-A
5
CS
R/W
OE
MMS MS1 24/32
STo0
STi0
STo1
C4i
F0i
+5V
+5V
MT8976
E8Ko
RxD
RxB
RxA
TxB
TxA
E1.5i
C1.5i
C2i
F0i
CSTi1
CSTo
CSTi0
DSTo
DSTi
Clock
Extractor
MMS
High Speed
Parallel
Telecom Bus
Line
Driver
Rx
Line
Driver
Tx
OUTA
OUTB
RxT
RxR
EQU
DIP
Switch
MT8941
CVb
F0i
C2o
F0b
C4b
C8Kb
12.352 MHz
Osc.
16.384 MHz
Osc.
MH89761
Signalling and
Link Control
BUS
IACK
IRQ
DTACK
R/W
DS
CS
A
0
-A
5
D
0
-D
7
STo0
STi0
STo1
C4i
F0i
MT8920B
(Mode 1)
1.544 MHz
the signalling and link control bus to the MH89760B
status and control channels. All signalling and link
functions may be controlled easily through the STPA
transmit RAM’s Tx0, Tx1, while status information is
read at receive RAM Rx0. In addition, interrupts can
be set up to notify the system in case of slips, loss of
sync, alarms, violations, etc.
3. PCM/Voice Channel Bank
The D3/D4 channel bank is one of the most widely
used pieces of equipment in the North American
network today. The D3/D4 channel converts 24
analog telephone lines into the 24 channels of a T1
serial stream. The channel bank is the interface point
between a digital switching or transmission system
and the analog telephone loop. The industry is
moving towards end-to-end digital connections
(ISDN), but the analog channel bank will still be in
use for many years to come.
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 MH89760B. The MH89760B
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MH89760BN | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MH89760BS | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MH89761 | T1 Transmit Equalizer Advance Information |
| MH89770N | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MH89770 | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MH89760BN | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ST-BUS⑩ FAMILY T1/ESF Framer & Interface Preliminary Information |
| MH89760BS | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ST-BUS⑩ FAMILY T1/ESF Framer & Interface Preliminary Information |
| MH89761 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:T1 Transmit Equalizer Advance Information |
| MH89770 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:T1/ESF Framer & Interface Preliminary Information |
| MH89770N | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:T1/ESF Framer & Interface Preliminary Information |
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