MT9074AL Zarlink Semiconductor, Inc., MT9074AL Datasheet - Page 39

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

Data Sheet
Clear Channel Capability
In T1 mode, when bit zero (CC) in the per time slot
control word is set no bit robbing for the purpose of
signaling will occur in this channel. This bit is not
used in E1 mode.
Microport Signaling
When bit one (RPSIG) is set, the transmit signaling for
the addressed channel can only be programmed by
writing to the transmit signaling page (pages 5H and
6H) via the microport. If zero, the transmit signaling
information is constantly updated with the information
from the equivalent channel on CSTi.
Per Time Slot Looping
Any channel or combination of channels may be
looped from transmit (sourced from DSTi) to receive
(output on DSTo) STBUS channels. When bit four
(LTSL) in the Per Time Slot Control Word is set the
data from the equivalent transmit timeslot is looped
back onto the equivalent receive channel.
Any channel or combination of channels may be
looped from receive (sourced from the line data) to
transmit (output onto the line) channels. When bit
five (RTSL) in the Per Time Slot Control Word is set
the data from the equivalent receive timeslot is
looped back onto the equivalent transmit channel.
PRBS Testing
If the control bit ADSEQ is zero (from master control
page 1 - access control word), any channel or
combination
programmed to contain a generated pseudo random
bit sequence (2
setting bit three (TTST), in the per time slot control
word.
If the control bit ADSEQ is zero, any combination of
receive channels may be connected to the PRBS
decoder (2
sequence causes the PRBS error counter to
increment. The receive channels are selected by
setting bit 2 (RRST) in the per time slot control word.
If PRBS is performed during a metallic or external
looparound, per time slot control words with TTST
set should have RRST set as well.
15
-1). Each error in the incoming
of
15
-1). The channels are selected by
transmit
channels
may
be
Digital Milliwatt
If the control bit ADSEQ is one, a digital milliwatt
sequence (Table 18) in T1 mode or (Table 19) in E1
mode may be transmit on any combination of
selected channels. The channels are selected by
setting bit three (TTST), in the Per Time Slot Control
Word.
Under the same control condition (ADSEQ equal to
one), the same digital milliwatt sequence is available
to replace received data on any combination of DSTo
channels. This is accomplished by setting bit two
(RRST) in the Per Time Slot Control Word for the
corresponding channel
Per Channel Inversion
When bit six (PCI) in the Per Time Slot Control Word
is set both transmit and receive data for the selected
channel is inverted before going onto the line / DSTo
respectively.
Transmit Message
When bit seven (TXMSG) in the Per Time Slot
Control Word is set the data transmit in the selected
Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8
Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8
Table 19 - A-Law Digital Milliwatt Pattern (E1)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Table 18 - Digital Milliwatt Pattern (T1)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
.
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
MT9074
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
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