PEF20550HV21XT Lantiq, PEF20550HV21XT Datasheet - Page 365

• Manufacturer Part Number: PEF20550HV21XT
• Manufacturer: Lantiq

Specifications of PEF20550HV21XT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

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6.1.5.2 Preparing to Loop Data from Terminal A to Terminal B
With all digits received, the P on the line card recognizes that the desired connection
can be switched by looping B-channels within the ELIC. To prepare this loop between
terminal A and terminal B the upstream B-channels are first switched to spare PCM time
slots. As the tristate field of these PCM time slots is not changed from its initialization
value (high impedance), the data is not switched to the PCM lines.
upstream: B1 time slot of IOM-2 channel 0 to PCM port 0, time slot 1
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upstream: B1 time slot of IOM-2 channel 1 to PCM port 0, time slot 2
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6.1.6
Part 4 of this Application Note described the preparations for looping data from
subscriber A to subscriber B. Up to this moment, however, subscriber B does not yet
know that subscriber A wishes to communicate with him. In this part of the Application
Note terminal B is alerted.
6.1.6.1 Activating the Line to Subscriber B
First the ELIC activates that part of the OCTAT-P that connects to terminal B. The
OCTAT-P activates and synchronizes the layer-1 device on terminal B before confirming
the activation to the ELIC.
ELIC initiates activation of subscriber B’s U
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As the line becomes active, the ELIC will signal an interrupt:
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If the µP responds slowly, the ELIC will continue signalling an interrupt:
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If the µP responds slowly, the ELIC will continue signalling an interrupt:
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Interrupt no longer signalled by the ELIC: during activation of the line to subscriber B, the
ELIC reports three changes of the C/I code from the OCTAT-P.
Semiconductor Group
MADR = 81
MAAR = 80
MACR = 71
MADR = 88
MAAR = 90
MACR = 71
Calling up Subscriber B
MADR = F3
MAAR = 18
MACR = 48
ISTA_E= 40
CIFIFO = 98
CIFIFO = 98
CIFIFO = 98
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H
upstream connection: (to) PCM port 0, TS1
upstream CM address: (from) CFI port 0, time slot 0
upper nibble: write CM data and code
lower nibble: set CM code for 64 kbit/s (8 bit) switching
upstream connection: (to) PCM port 0, TS2
upstream CM address: (from) CFI port 0, time slot 4
upper nibble: write CM data and code
lower nibble: set CM code for 64 kbit/s (8 bit) switching
set downstream C/I code to ‘1100’ (active, blocked)
downstream CM address: CFI port 0, time slot 6
write data to the CM data field
at least one valid entry in C/I FIFO
change in C/I value at port 0, time slot 6 (IOM-2 channel 1)
second change in C/I value at port 0, time slot 6
third change in C/I value at port 0, time slot 6
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line:
Application Notes
PEB 20550
PEF 20550
01.96