pef20550 Infineon Technologies Corporation, pef20550 Datasheet - Page 362

• Manufacturer Part Number: pef20550
• Description: Extended Line Card Interface Controller Elic
• Manufacturer: Infineon Technologies Corporation

6.1.4
When subscriber A takes the receiver off the hook, the layer-1 device (e.g. the
ISAC-P TE) of terminal A activates the physical layer between itself and the line card.
Figure 126
Call-up by Subscriber A
The ELIC reports this activation by signalling an interrupt. To allow the D-channel arbiter
to monitor subscriber A, the line activation must be confirmed and the D-channel arbiter
of the ELIC enabled for the subscriber. With D-channel communications between the
subscriber and the ELIC established, the ETSI / E-DSS1 protocol can be followed to
build up layers 2 and 3.
6.1.4.1 Handling of C/I Interrupt
When subscriber A hooks OFF, the ELIC signals an interrupt:
Read
Read
If the P responds slowly, the ELIC continues signalling an interrupt:
Read
If the P responds slowly, the ELIC continues signalling an interrupt:
Read
Interrupt no longer signalled by the ELIC: when subscriber A hooks OFF, the ELIC
reports three changes of the C/I code from the OCTAT-P.
Reading the current upstream C/I value of IOM-2 channel 0:
Write
Write
Read
Semiconductor Group
Subscriber A
Subscriber B
Line Activation by Subscriber A
ISTA_E= 40
CIFIFO = 88
CIFIFO = 88
CIFIFO = 88
MAAR = 88
MACR = C8
MADR = F3
U
U
PN
PN
OCTAT -P +
Transceivers
H
H
H
H
H
Digital Line Card
H
H
R
at least one valid entry in C/I FIFO
change in C/I value at port 0, time slot 2 (IOM-2 channel 0)
second change in C/I value at port 0, time slot 2
third change in C/I value at port 0, time slot 2
upstream CM address where C/I value changed
read data from the CM data field
upstream C/I code ‘1100’ (active indication)
of IOM-2 channel 0 has activated his line
IOM -2 (LC)
R
µP
362
SACCOB
ELIC
R
PCM
Switching
Network
Application Notes
HDLC Group
Controller
the subscriber
PEB 20550
PEF 20550
ITS08106
01.96