MH88634-2 Datasheet, PDF (1/12 Pages) Mitel Networks Corporation – Central Office Interface Circuit Preliminary Information

MH88634-2
Central Office Interface Circuit
Preliminary Information
Features
• Loop Start Trunk Interface
• 600Ω Input Impedance
• 2-4 Wire Conversion
• Line state Detection Outputs:
- Forward Loop
- Reverse Loop
- Ringing Voltage
- Switch Hook
• One Relay Driver
• On-Hook Reception
• Small footprint area (<4.75cm²)
• Meets FCC Part 68 Leakage Current
Requirements
Applications
Interface to Central Office for:
• PABX
• Key Telephone Systems
• Channel Bank
• Voice Mail
• Terminal Equipment
• Digital Loop Carrier
• Optical Multiplexer
ISSUE 5
August 1998
Ordering Information
MH88634-2 21 Pin SIL Package
MH88634T-2 21 Pin 90° L/F Package
0°C to 70°C
Description
The Mitel MH88634-2 Central Office Trunk Interface
circuit provides a complete analog and signalling link
between audio switching equipment and a Telephone
Line. This device is available in a single in line
package for high packing densities.
The device is fabricated as a thick film hybrid
incorporating various technologies for optimum
circuit design and very high reliability.
RV FL RL SHK XLA XLB XLC XLD
Status
Detection
VCC VEE AGND
TMIP
RING
LRC
LRD
Dummy
Ringer
Line
Termination
2 - 4 Wire
Hybrid
Loop Relay
Driver
Impedance
Matching
Network
Balance
VRLY
Figure 1 - Functional Block Diagram
Receive
Gain
RX
Transmit
Gain
TX
2-265