®
MH89793
E1 Transceiver with Selectable Impedance
Preliminary Information
Features
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Complete primary rate 2048kb/s CEPT line
driver and receiver
Onboard pulse transformers for transmit and
receive
Meets latest ETSI requirements [ETSI ETS 300
011 (NET 5)]
Inductorless clock recovery
Loss of signal (LOS) indication
Single +5V operation
Compatible with MT9079 Framer
Selectable termination impedance
ISSUE 1
April 1995
Ordering Information
MH89793 28 Pin DIL Package
Surface Mount Option is available by adding
the suffix “S”
0°C to +70°C
Description
The Mitel MH89793 is a low cost E1 line
driver/receiver with clock extraction requiring no
external components.
The device is suitable for both 120R and 75R
applications, by linking external pins.
By combining the MH89793 with Mitel’s E1 framer,
the MT9079, a cost effective and efficient interface to
E1 lines can be built.
Applications
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Primary rate ISDN network Interface
Multiplexer equipment
Private Network links
Isochronous LANS/WANS
VDD
VSS
TZA1 TZA2 TZA3 TZB1 TZB2 TZC1 TZC2 TZD1 TZD2
TxA
TxB
Line
Driver
Transmit
Isolation
Transformer
6dB
Pad
TLA
TLB
E2o
LOS
Clock
Recovery
Receive
Isolation
Transformer
RLA
RLB
RxA
RxB
Line
Receiver
EQUIPMENT SIDE
LINE SIDE
RZA
RZB
Figure 1 - Functional Block Diagram
4-229
MITEL [ MITEL NETWORKS CORPORATION ]
