ORT8850H AGERE [Agere Systems], ORT8850H Datasheet - Page 26

• Manufacturer Part Number: ORT8850H
• Description: Field-Programmable System Chip (FPSC) Eight-Channel x 850 Mbits/s Backplane Transceiver
• Manufacturer: AGERE [Agere Systems]

ORCA ORT8850 FPSC
Eight-Channel x 850 Mbits/s Backplane Transceiver
Backplane Transceiver Core Detailed Description
SPE and C1J1 Outputs. These two signals for each channel are passed to the FPGA logic to allow a pointer pro-
cessor or other function to extract payload without interpreting the pointers. For the ORT8850, each frame has
12 STS-1s. In the SPE region, there are 12 J1 pulses for each STS-1s. There is one C1(J0, new SONET specifica-
tions use J0 instead of C1 as section trace to identify each STS-1 in an STS-N) pulse in the TOH area for one
frame. Thus, there is a total of 12 J1 pulses and one C1(J0) pulse per frame. C1(J0) pulse is coincident with the J0
of STS1 #1. In each frame, the SPE flag is active when the data stream is in SPE area. SPE behavior is dependent
on pointer movement and concatenation. Note that in the TOH area, H3 can also carry valid data. When valid SPE
data is carried in this H3 slot, SPE is high in this particular TOH time slot. In the SPE region, if there is no valid data
during any SPE column, the SPE signal will be set to low. SPE allows a pointer processor to extract payload with-
out interpreting the pointers. The SPE and C1J1 functionality are described in Table 5. For generic data operation,
valid data is available when SPE is 1 and the C1J1 signal is ignored.
Table 5
Note:The following rules are observed for generating SPE and C1J1 signals: on occurrence of AIS-P on any of the STS-1, there is no corre-
Note:
C1J1 signal behavior shown in this figure is just for illustration purposes: C1 pulse position must always be as shown; however, position of J1
pulses vary based on path overhead location of each STS-1 within the STS-12 stream.
C1J1 signal must always be active during C1(J0) time slot of STS#1.
C1J1 signal must also be active during the twelve J1 time slots. However, C1J1 must not be active for any STS-1 for which AIS-P is generated.
Also, on concatenated payloads, only the head of the group must have a J1 pulse.
26
STS-12
STS-12
C1J1
SPE
sponding J1 pulse. In case of concatenated payloads (up to STS48c), only the head STS-1 of the group has an associated J1 pulse.
C1J1 signal tracks any pointer movements. During a negative justification event, SPE is set high during the H3 byte to indicate that pay-
load data is available. During a positive justification event, SPE is set low during the positive stuff opportunity byte to indicate that payload
data is not available.
.
SPE
SPE and C1J1 Functionality
0
0
1
1
A1 A1 A1 A1 A1 A1 A1 A1 A1 A1 A1 A1 A2 A2 A2 A2 A2 A2 A2 A2 A2 A2 A2 A2 J0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0
C1J1
0
1
0
1
Figure 6. SPE and C1J1 Functionality
TOH information excluding C1(J0) of STS1 #1.
Position of C1(J0) of STS1 #1 (one per frame). Typically used to provide a
unique link identification (256 possible unique links) to help ensure cards
are connected into the backplane correctly or cables are connected
correctly.
SPE information excluding the 12 J1 bytes.
Position of the 12 J1 bytes.
TOH ROW # 1
C1 PULSE
(continued)
Description
1 2 3 4 5 6 7 8 9 10 11 12
first SPE BYTES OF THE
12 STS-1S
SPE ROW # 1
Agere Systems Inc.
J1 PULSE OF
3RD STS-1
August 2001
Data Sheet
5-9330(F)