mh89791 Mitel, mh89791 Datasheet
mh89791
Manufacturer Part Number
mh89791
Description
Cept Pcm 30 Transmit Equalizer Advance Information
Manufacturer
Mitel
Datasheet
1.MH89791.pdf
(4 pages)
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Part Number
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Price
Part Number:
MH89791
Manufacturer:
MITEL
Quantity:
20 000
Features
•
•
•
Description
The MH89791 is a programmable network for use
with a PCM 30 line interface, specifically the
MH89790B on The ISDN EXPRESS™ Card. The
MH89791 contains transmit equalizer and a 6 dB
pad, for external loop around, with 120
output impedances.
hybrid technology and is 2 inches high by 0.5 inches
wide. The MH89791 is designed to interface to 22
gauge/.6 mm twisted pair. Figure 1 shows how the
MH89791 is connected to the transmit side of a PCM
30 interface.
distance settings of the equalizer. Ti, Ri, TL, and RL
are the inputs and outputs of the 6 dB pad. The 4
pole double throw relay connected to the transformer
inputs and outputs shows how the transmit signal is
switched between the equalizer for normal operation,
Used with the MH89790B
Programmable equalization for different line
lengths
6dB loop around circuit
MH89790B
OUTA
OUTB
RxR
RxT
The seven switches control the
It is fabricated in thick film
+12V
C2
L1
•
.8:
.8:
1:
1:
Figure 1 - Connection Diagram
input and
:0.5
:1
•
•
and the 6dB pad for loop around. Figure 2 shows the
circuit description of the MH89791 while Figure 3
shows the switch settings for the Tx equalizer.
•
•
CEPT PCM 30 Transmit Equalizer
•
•
Ordering Information -40° C to 85°C
S1
S2
S3
S4
S5
S6
S7
MH89791
RCHR
RCHT
RCLR
RCLT
TxR
TxT
EIR
SW
EIT
EC
RL
RL
EA
EB
EIT
EIR
EA
EB
EC
SW
RCLT
RCHT
RCLR
RCHR
Ti
Ri
TL
TL
L1
L2
Pin Connections
TI
Ri
MH89791
ISSUE 4
Advance Information
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
20 Pin SIP Hybrid
TxR
TxT
RL
TL
•
MH89791
C2 = .47 F
L1 = 33 H
•
May 1995
4-219
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mh89791 Summary of contents
Page 1
... It is fabricated in thick film hybrid technology and is 2 inches high by 0.5 inches wide. The MH89791 is designed to interface to 22 gauge/.6 mm twisted pair. Figure 1 shows how the MH89791 is connected to the transmit side of a PCM 30 interface. The seven switches control the distance settings of the equalizer. Ti, Ri, TL, and RL are the inputs and outputs of the 6 dB pad ...
Page 2
... Ring O • -=SWITCH OPENED S4 - X=SWITCH CLOSED EQUALIZATION Figure 3 - Switch Settings for Different Levels of Equalization 4-220 EQUALIZER EiT Tip • Line 60 60 Ring • Line EiR Figure 2 - MH89791 Circuit Description - - ...
Page 3
... AAAA AAAA AAAA AAAA Pin 1 Side View 0.010 + 0.002 (0.25 + 0.05) 0.2 Max. (5.1 Max.) 0.05 (1.3 0.3) Notes: 1) Not to scale. 2) Dimensions in inches 3) (Dimensions in millimeters) 4) Dimension to center of pin 2.00 + 0.02 (50 Front View 1 0.01 * 0.05 + 0.02 0.020 + 0.005 (1.3 + 0.5) (0.51 + 0.13) Figure 4 - Mechanical Data MH89791 0.40 + 0.02 (10 0.18 + 0.02 (4.6 + 0.5) 0.10 + 0.01 (2.5 + 0.2) 4-221 ...
Page 4
... MH89791 NOTES: 4-222 Advance Information ...