MT9074AL Zarlink Semiconductor, Inc., MT9074AL Datasheet - Page 79

• Manufacturer Part Number: MT9074AL
• Description: T1/E1/J1 Single Chip Transceiver
• Manufacturer: Zarlink Semiconductor, Inc.

MT9074
79
6-4
2-0
Bit
7
3
RES2-0
REDBL
Name
TX2-0
NRZ
NRZ Format Selection. Only used in the digital framer only mode (LIU is
disabled). A one sets the MT9074 to accept a unipolar NRZ format input
stream on RxA as the line input, and to transmit a unipolar NRZ format
stream on TxB. A zero causes the MT9074 to accept a complementary pair
of dual rail inputs on RxA/RxB and to transmit a complementary pair of dual
rail outputs on TxA/TxB.
Transmit Pulse Amplitude. Select the TX2 –TX0 bits according to the line
type, value of termination resistors (RT), and transformer turns ratio used
TX2 TX1 TX0
After reset these bits are zero.
Receive Equalizer Disable. If one the receive equalizer is turned off. If zero,
the receive equalizer is turned on and will compensate for loop length
automatically.
Receive Equalization Select. Setting these pins forces a level of
equalization of the incoming line data.
RES2
These settings have no effect if REDBL is set to zero.
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Table 94 - LIU Control Word (E1)
0
0
1
1
0
0
1
1
(Page 1, Address 1FH)
0
1
0
1
0
1
0
1
RES1
0
0
1
1
0
0
1
1
Line Impedance(ohms) RT(ohms)
120/75
120
120
120
75
75
75
75/120
Functional Description
RES0
0
1
0
1
0
1
0
1
Receive Equalization
0
0
15
12.1
0
0
9.1
12.1
0 ÷ 10dB
10 ÷ 18dB
18 ÷ 25dB
25 ÷ 30dB
>30dB
reserved
reserved
reserved
Transformer Ratio
1:2
1:1
1:2
1:2
1:2
1:1
1:2
1:2
Data Sheet