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參數(shù)資料
| 型號： | MH89790B |
| 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)： | 19/32頁 |
| 文件大?。?/td> | 488K |
| 代理商： | MH89790B |
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4-205
Preliminary Information
MH89790B
Table 18. Typical Parameters of the Input and Output Transformers
Parameter
(Units)
Through Hole
Units
TFS 2574-4
TFS 2915
-4
-5
Transformer Type
input
output
output
Inductance (mH)
(COM1-75
)
(COM1-120
)
>1.2
>1.9
0.49
0.81
>1
>1.5
Turns Ratio
(COM1-75
):(A-F1):(B-F2)
(COM1-120
):(COM1-75
)
1:1:1
126:1
04:1:1
128:1
112:1:1
122:1
Line Impedance (
)
Operational Voltage (Volts)
75/120
75/120
75/120
-
+12
+5
Dielectric Strength (Vrms)
1500
1500
1500
Line Side
System Side
O
O
O
O
O
O
COM1
120
A
F2
F1
B
O
75
Applications
ISDN Primary Rate User Network Interface
Typical examples of primary rate interfaces are high
capacity links from a PBX to a Central Office
Exchange or multiple links between PBX’s in a large
private network. With the advent of Integrated
Services Digital Networks (ISDN) a limited set of
network interfaces is specified to allow equipment
from different vendors to operate in the network.
The MH89790B conforms to the ISDN S/T Primary
Rate reference point standard, which calls for 30 B
channels (64 kbit/s) and one D channel (64 kbit/s).
Figure 15 illustrates a typical application of the
MH89790B in an ISDN environment.
Three types of information are passed through serial
busses of the MH89790B:
USER DATA - The data streams of the MH89790B
are shown connected to the MT8980 Digital
Crosspoint Switch. This allows voice and data
channels to be switched dynamically within the
system.
SIGNALLING - Signalling information on the ISDN
primary rate interface is carried over the D-channel
using LAPD procedures. The ISDN D-channel is
created by placing the MH89790B in Common
Channel Signalling mode. The D-channel is tapped
off from the ST-BUS and connected to the MT8952
Protocoller Controller. It receives and transmits data
packets serially, in accordance with LAPD protocol
requirements.
CONTROL - The MT8920B (STPA) provides
microprocessor access to directly control the
MH89790B through its transmit and receive dual port
RAMs. Status information can generate interrupts to
notify the system in case of slips, loss of
synchronization, alarms, violations, etc.
Interfacing to the Coaxial Cable Transmission
Line
Reliable operation of the CEPT link is directly related
to the type of transmission medium and method of
interfacing.
Coaxial
cables
transmission mediums if used properly. One of the
most important things to remember is that the
receive end of the cable must not be connected to
ground, as shown in Figure 16. If both ends are
provide
excellent
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MH89790BN | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MH89790BS | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MH89791 | CEPT PCM 30 Transmit Equalizer Advance Information |
| MH89792-1 | E1 Transceiver Preliminary Information |
| MH89792 | E1 Transceiver Preliminary Information |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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 |
| 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 |
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