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TP3404V Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # TP3404V
Description  Quad Digital Adapter for Subscriber Loops (QDASL)
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

TP3404V Datasheet(HTML) 5 Page - National Semiconductor (TI)

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Connection Diagram
TLH11924 – 2
Top View
Order Number TP3404V
See NS Package Number V28A
Functional Description
The QDASL contains 4 transceivers each of which can in-
teroperate with any of the TP340X family of single-channel
DASL transceivers Each QDASL transceiver has its own
independent line transmit and receive section timing recov-
ery circuit scramblerdescrambler and loop activation con-
troller Functions which are shared by the 4 transceivers
include the Microwire control port and the digital interface
with time-slot assignment
BURST MODE OPERATION
For full-duplex operation over a single twisted-pair burst
mode timing is used with the QDASL end of each line act-
ing as the loop timing master and the DASL at the terminal
being the timing slave (the QDASL transceivers cannot op-
erate in loop timing slave mode)
Each burst within a DASL line is initiated by the QDASL
Master transmitting a startbit for burst framing followed by
the B1 B2 and D channel data from 2 consecutive 8 kHz
frames combined in the format shown in
Figure 1 During
transmit bursts the receiver input for that channel is inhibit-
ed to avoid disturbing the adaptive circuits The slave’s re-
ceiver is enabled at this time and it synchronizes to the start
bit of the burst which is always an unscrambled ‘‘1’’ (of the
opposite polarity to the last ‘‘1’’ sent in the previous burst)
When the slave detects that 36 bits following the start bit
have been received it disables the received input waits 6
line symbol periods to match the other end settling guard
time and then begins to transmit its burst back towards the
master which by this time has enabled its receiver input
The burst repetition rate is thus 4 KHz
LINE TRANSMIT SECTIONS
Alternate Mark Inversion (AMI) line coding in which binary
‘‘1’’s are alternately transmitted as a positive pulse then a
negative pulse is used on each DASL line because of its
spectral efficiency and null DC energy content All transmit-
ted bits excluding the start bit are scrambled by a 9-bit
scrambler to provide good spectral spreading with a strong
timing content The scrambler feedback polynomial is X9 a
X5 a 1
TLH11924 – 3
FIGURE 1 Burst Mode Timing on the Line
5


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