
IDT82P2288
OCTAL T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
Functional Description
66
March 04, 2009
Figure 16. Signaling Output In T1/J1 Mode
3.15.2 E1 MODE
In Signaling Multi-Frame, the signaling bits are located in TS16 (refer
to
Figure 13), which are Channel Associated Signalings (CAS). The
signaling codewords (ABCD) are clocked out on the RSIGn/
MRSIGA(MRSIGB) pins. They are in the lower nibble of the timeslot with
its corresponding data serializing on the RSDn/MRSDA(MRSDB) pins
When the EXTRACT bit is set to ‘1’, the signaling bits in its corre-
sponding timeslot are extracted to the A,B,C,D bits in the Extracted
Signaling Data/Extract Enable register. The data in the A,B,C,D bits in
the register are the data to be output on the RSIGn/MRSIGA(MRSIGB)
pins. The bits corresponding to TS0 and TS16 output on the RSIGn/
MRSIGA(MRSIGB) pins are Don’t-Care.
Signaling de-bounce will be executed when the DEB bit is set to ‘1’.
Thus, the A,B,C,D bits in the Extracted Signaling Data/Extract Enable
register are updated only if 2 consecutive received ABCD codewords of
the same timeslot are identical.
Signaling freezing is performed automatically when it is out of Basic
frame synchronization, out of Signaling multi-frame synchronization or
slips occurs in the Elastic Store Buffer. It is also performed when the
FREEZE bit is set to ‘1’. The signaling freezing freezes the signaling
data in the A,B,C,D bits in the Extracted Signaling Data/Extract Enable
register as the previous valid value.
Each time the extracted signaling bits in the A,B,C,D bits in the
Extracted Signaling Data/Extract Enable register are changed, it is
captured by the corresponding COSI[X] bit (1
≤ X ≤ 30). When the SIGE
bit is set to ‘1’, any one of the COSI[X] bits being ‘1’ will generate an
interrupt and will be reported by the INT pin.
The EXTRACT bit and the A,B,C,D bits are in the indirect registers of
the Receive CAS/RBS Buffer. They are accessed by specifying the
address in the ADDRESS[6:0] bits. Whether the data is read from or
written into the specified indirect register is determined by the RWN bit
and the data is in the D[7:0] bits. The access status is indicated in the
details about the indirect registers write/read access.
Figure 17. Signaling Output In E1 Mode
Channel 24
Channel 1
Channel 2
Channel 24
A B C D
RSDn/
MRSDA(MRSDB)
RSIGn/
MRSIGA(MRSIGB)
F
1 2 3 4 5 6 7 8
Channel 1
F
F-bit
1 2 3 4 5 6 7 81 2 3 4 5 6 7 8
A B C D
1 2 3 4 5 6 78
TS31
TS0
TS1
TS15
TS16
TS17
TS31
TS0
1 2 3 4 5 6 78 1 2 3 4 5 6 78
1 2 3 4 5 6 78 1 2 3 4 5 6 78 1 2 3 4 5 6 78
1 2 3 4 5 6 78 1 2 3 4 5 6 78
ABCD
RSDn/
MRSDA(MRSDB)
RSIGn/
MRSIGA(MRSIGB)