MITEL MH89101 Datasheet
MH89101
Passive Line Termination Circuit
Advance Inf orm at ion
Features
• Passive Line Termination (PLT) for MT8910
DSLIC
• High preci sion tr imme d resist ors
• Excellent resistor matching required to meet
longitud inal bala nce as spe cifi ed in ANS IT1.601
• Compact S IL pa ckag e
Applications
• Pair gain system
• ISDN NT1 and N T2 inte rface s
• Digital mul tiplex ers and c oncen trat ors
• ISDN U-interface term inals
ISSUE 1 August 1991
Ordering Information
MH89101 6 Pin SIL Package
0°C to +70°C
Description
The MH89101 is a thick film hybrid device which is
used in conjunction with the MT8910 to perform two
to four wire conversion and analog signal
conditioning on the received 2B1Q signal.
The signal conditioning is necessary to enable the
DSLIC to interface to the Digital Subscriber Line as
defined in ANSI T1.601-1988. The precanceller
block will perform two to four wire conversion and
provide adequate isolation between transmit and
receive paths.
The small size and the precise resistor matching on
the hybrid makes it suitable for line card or terminals
which use the MT8910 2B1Q U-Interface
Transceiver.
RXout -
RXout +
TXin +
Compensator
Circuit
Precanceller
TXin -
Figure 1 - Functional Block Diagram
XFM +
XFM -
9-29
MH89101 Advance Information
TXin +
XFM +
RXout +
RXout -
XFM TXin -
(component side)
1
2
3
4
5
6
Figure 2 - Pin Connections
Pin Description
Pin # Name Description
1TX
2XFM+Transformer . Node of the 2 to 4 wire converter which must be connected to the primary of
3RX
4RX
5XFM-T ransformer. Node of the 2 to 4 wire converter which must be connected to the primary of
Transmit Line Signal Input. Must be connected to the L
in+
output of the DSLIC.
out+
the line transformer.
Receive Line Signal Output. Output of the compensator circuit which must be connected
out+
to the L
Receive Line Signal Output. Output of the compensator circuit which must be connected
out-
to the L
input of the DSLIC.
in+
input of the DSLIC.
in-
the line transformer.
6TX
Transmit Line Signal Input. Must be connected to the L
in-
output of the DSLIC.
out-
9-30
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