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參數資料
| 型號： | MH88634K |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Central Office Interface Circuit Preliminary Information |
| 中文描述： | 中央辦公室接口電路的初步信息 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 66K |
| 代理商： | MH88634K |
2-261
Features
Loop Start Trunk Interface
600 Ohm input impedance
Line state detection outputs:
- forward loop
- reverse loop
- ringing voltage
- service out
Transformerless 2W to 4W conversion
One loop start relay driver
+/- 5V operation
Applications
Interface to Central Office for:
PABX
Key Telephone Systems
Channel Bank
Voice Mail
Terminal Equipment
Digital Loop Carrier
Optical Multiplexer
Description
The Mitel MH88634K Central Office Trunk Interface
circuit provides a complete audio and signalling link
between audio switching equipment and a central
office. The functions provided by the MH88634K
include 2-4 Wire conversion, 600 Ohm input
impedance and network balance. The device is
fabricated as a thick film hybrid incorporating various
technologies for optimum circuit design and very
high reliability.
Figure 1 - Functional Block Diagram
Status
Detection
Receive
Gain
Transmit
Gain
2 - 4 Wire Hybrid
Dummy
Ringer
Loop
Termination
Loop Relay
Driver
Impedance
Matching
Network
Balance
XLA
XLB
XLC
XLD
LRC
LRD
VRLY RGND
RING
TIP
RV FL RL SO
VDD VEE AGND
Rx
Tx
ISSUE 3
April 1995
Ordering Information
MH88634K
21 Pin SIL Package
0
°
C to 70
°
C
MH88634K
Central Office Interface Circuit
Preliminary Information
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