Data Sheet
June 2003
TTSV02622 STS-24 Backplane Transceiver
Receiver Block
(continued)
Pointer Mover Subblock (Backplane to Line)
(continued)
There is no restriction on how many or how often increments and decrements are processed. Any received incre-
ment or decrement is immediately passed to the generator for implementation regardless of when the last pointer
adjustment was made. The responsibility for meeting the SONET criteria for max frequency of pointer adjustments
is then left to the upstream pointer processor.
When the interpreter signals an AIS state, the generator will immediately begin sending out 0xFF in place of data
and H1, H2, H3. This will continue until the interpreter returns to NORM or CONC states and a J1 byte is received.
Miscellaneous Functions
K1/K2, A1/A2 Handling
K1/K2 bytes can be optionally passed through the pointer mover under software control, or it can be set to zero
with the other TOH bytes. A1/A2 bytes are regenerated and set to F6 and 28, respectively.
SPE C1J1 Outputs
In an attempt to minimize the complexity required from the pointer processor that may be hooked-up to the
TTSV02622 parallel output port, two signals (per channel) must be provided to the external world; these are called
SPE and C1J1. These two signals will allow a pointer processor to extract payload without interpreting the point-
ers.
Table 5. SPE and C1J1 Functionality
SPE
0
0
1
1
C1J1
0
1
0
1
Description
TOH information excluding C1(J0) of STS-1 #1.
Position of C1(J0) of STS-1 #1.
SPE information excluding the 12 J1 bytes.
Position of the twelve J1 bytes.
The following rules must be observed for generating SPE and C1J1 signals:
s
s
On occurrence of AIS-P on any of the STS-1, there must be no corresponding J1 pulse.
In case of concatenated payloads (up to STS-24c), only the head STS-1 of the group must have an associated J1
pulse.
C1J1 signal must track any pointer movements.
During a negative justification event, SPE must be set high during the H3 byte to indicate that payload data is
available.
During a positive justification event, SPE must be set low during the positive stuff opportunity byte to indicate that
payload data is not available.
s
s
s
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