peb2256 Infineon Technologies Corporation, peb2256 Datasheet - Page 77
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peb2256
Manufacturer Part Number
peb2256
Description
E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB2256.pdf
(490 pages)
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Because the CAS controller is working on the PCM highway side of the receive buffer,
slips disturb the CAS data.
Figure 21
4.1.14.5 Channel Associated Signaling CAS (E1, µP access mode)
The signaling information is carried in time slot 16 (TS16). Receive data is stored in
registers RS(16:1) aligned to the CAS multiframe boundary. The signaling controller
samples the bit stream either on the receive line side or if external signaling is enabled
on the receive system side.
The signaling procedure is done as it is described in ITU-T G.704 and G.732.
The main functions are:
• Synchronization to a CAS multiframe
• Detection of AIS and remote alarm in CAS multiframes
• Separation of CAS service bits X1 to X3
• Storing of received signaling data in registers RS(16:1) with last look capability
Updating of the received signaling information is controlled by the freeze signaling
status. The freeze signaling status is automatically activated if a loss-of-signal
(FRS0.LOS = 1), or a loss of CAS multiframe alignment (FRS1.TSL16LFA = 1) or a
receive slip occurs. The current freeze status is output on port FREEZE (RP(A:D)) and
indicated by register SIS.SFS. Optionally automatic freeze signaling can be disabled by
setting bit SIC3.DAF. If SIS.SFS is active, updating of the registers RS(16:1) is disabled.
To relieve the µP load from always reading the complete RS(16:1) buffer every 2 ms the
FALC56 notifies the µP through interrupt ISR0.CASC only when signaling changes from
Data Sheet
SYPR
SCLKR
RDO
RSIG
T
FAS
NFAS
ABCD
0000XYXX
A B C D
4 5 6 7
2.048 MHz Receive Signaling Highway (E1)
TS31
T
FAS/NFAS
FAS/NFAS
TS0
= Time slot offset (RC0, RC1)
= Frame alignment signal
= TS0 not containing FAS
= Signaling bits for time slots 1...15 and 17...31 of CAS multiframe
= CAS multiframe alignment signal in TS16
0 1 2 3 4 5 6 7
TS1
A B C D
125 µs
77
0 1 2 3 4 5 6 7
0 0 0 0 X Y X X
TS16
Functional Description E1
0 1 2 3 4 5 6 7
FALC56 V1.2
TS31
A B C D
PEB 2256
2002-08-27
F0133
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