MT9074
Advance Information
Bit
Name
Functional Description
Bit
Name
Functional Description
Unused.
7
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.
7-5
4
- - -
LCDIM
Loop Code Detected Interrupt
Mask. When unmasked an
interrupt is triggered when either
the loop up (00001) or loop down
(001) code has been detected on
the line for a period of 48
milliseconds. If 1 - unmasked, 0 -
masked.
3
2
1
1SECIM One Second Status Interrupt
Mask. When unmasked an
interrupt is initiated when the
1SEC status bit (page 3 address
12H bit 7) goes from low to high.
If 1 - unmasked, 0 - masked.
6 -
4
TXL2-0 Transmit Line Build Out 2 - 0.
Setting these bits shapes the
transmit pulse as detailed in the
table below:
TX22 TXL1 TXL0 Line Build Out
5SECIM Five Second Status Interrupt
Mask. When unmasked an
interrupt is initiated when the 5
SEC status bit goes from low to
high. If 1 - unmasked, 0 -
masked.
0
0
0
0
1
1
1
1
0
0
0 to 133 feet/ 0 dB
133 to 266 feet
266 to 399 feet
399 to 533 feet
533 to 655 feet
-7.5 dB
0
1
1
1
0
0
1
1
0
1
0
1
0
1
BIOMIM Bit
Oriented
Mask.
Message
Interrupt
When
-15 dB
unmasked an interrupt is initiated
when pattern
-22.5 dB
a
After reset these bits are zero.
111111110xxxxxx0 has been
received on the FDL that is
different from the last message.
The new message must persist
for 8 out the last 10 message
positions to be accepted as a
valid new message. If 1-
unmasked, 0 - masked.
3
REDBL 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.
2-0 RES2-0 Receive Equalization Select.
Setting these pins forces a level of
equalization of the incoming line
data.
0
SIGIM
Signalling
Interrupt
Mask.
When unmasked an interrupt will
be initiated when a change of
state (optionally debounced - see
DBEn in the Data Link, Signalling
Control Word page 1 address
12H) is detected in the signalling
bits (AB or ABCD) pattern. If 1 -
unmasked, 0 - masked.
RES2 RES1 RES0 Receive
Equalization
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
none
6dB
12dB
18dB
24dB
Table 35 - Interrupt Mask Word Three (T1)
(Page 1, Address 1EH)
reserved
reserved
reserved
These settings have no effect if
REDBL is set to zero.
Table 36 - LIU Control Word (T1)
(Page 1, Address 1FH)
o
50
MITEL [ MITEL NETWORKS CORPORATION ]
