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MT90710AP Datasheet(PDF) 6 Page - Mitel Networks Corporation

Part No. MT90710AP
Description  High-Speed Isochronous Multiplexer
Download  12 Pages
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Manufacturer  MITEL [Mitel Networks Corporation]
Direct Link  http://www.mitel.com
Logo MITEL - Mitel Networks Corporation

MT90710AP Datasheet(HTML) 6 Page - Mitel Networks Corporation

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MT90710
Preliminary Information
5-8
The MT90710 provides 15.808 Mb/s clear channel,
user
bandwidth
in
both
transmit
and
receive
directions. In addition, two 8 kHz sampled signals
and one 32 kHz sampled signal are encoded and
transported
over
the
loop
as
additional
user
bandwidth.
These
asynchronous
signals,
in
combination with overhead information and clear
channel bandwidth produce an aggregate data rate
of 16.384 Mb/s. After encoding (4B/5B) the final
transmitted baud rate is 20.48 Mbaud.
Transmit
The transmit data interface consists of nine ST-BUS
input links and three asynchronously sampled input
signals. These are STi0 - STi5, STi6A and STi6B,
STi7, DIN8K0, DIN8K1 and DIN32K. Six ST-BUS
input
links,
STi0-5,
each
provide
2.048
Mb/s
transparent transmission bandwidth. With ST6MUX
Mode disabled STi6A is also a 2.048 Mb/s link while
STi6B is not used (see ST6MUX description). The
first nine channels of the STi7 input are ignored
leaving
the
remaining
23
channels
for
user
bandwidth. This allows a total of 15.808 Mb/s clear
bandwidth for application use.
The first nine (576
kb/s) channels of STi7 are made available for
transmitting
the
three
asynchronous
signals
combined with fiber overhead information. This
overhead is automatically compiled in the transmit
interface and inserted
into
these timeslots for
transmission over the fiber interface.
Overhead
information
includes
a
frame
synchronization byte, an error count and a checksum
calculated on the previous frame of transmitted data.
Once compiled, the contents of the transmit data
bandwidth
is
first
4B/5B
encoded,
then
NRZI
encoded before it is applied to the transmit fiber
interface driver via TxDATA. 4B/5B ensures that the
NRZI encoded data will contain a minimum of two
transitions per baud. This is sufficient to allow the far
end to extract the embedded clock information. As a
result of 4B/5B encoding the information bandwidth
of 16.384 Mb/s increases to a total baud rate of
20.48 MBaud/s at the fiber interface.
Incoming ST-BUS link data is latched at the mid-bit
position of the internal timeslot. Since there is a
phase difference between the internal and external
timeslots, due to the operation of the PLL, latching
occurs at approximately the 3/4 bit position of the
external
timeslot when
in
Controller
mode.
In
Peripheral mode data is latched at the midpoint of
the timeslot. Asynchronous signals DIN8K0-1 are
sampled once per frame (8,000 times per second)
and
are
intended
to
convey
relatively
static
information where a state transition is not time
critical enough that a resolution of one frame is
detrimental.
Asynchronous
signal
DIN32K
is
sampled four times per frame (32,000 times per
second) and may be used to transport data at a
higher rate than the other two asynchronous inputs.
As an example, this sampling rate is sufficient to
support 19.2K Baud RS-232 signals (TTL levels) so
that remote programming or loop maintenance may
be performed.
255
0
1
2
3
4
5
6
7
8
9
..........
246
247
248
249
250 251
252 2
Fiber Timeslot
Channel Assignment
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
4B/5B Encoded Data Bit Assignment
Frame Pulse
ST6 Ch0
ST5 Ch0
ST4 Ch0
ST3 Ch0
ST2 Ch0 ST1 Ch0
ST0 Ch0
ST6 Ch1
ST7 Ch0
ST7 Ch1
Figure 3 - Fiber Timeslot Assignment


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