tdat04622 ETC-unknow, tdat04622 Datasheet - Page 23

• Manufacturer Part Number: tdat04622
• Description: Tdat Sonet/sdh 155/622/2488 Mbits/s Data Interfaces
• Manufacturer: ETC-unknow

May 2001
Agere Systems Inc.
Overhead Processor (OHP)
OHP1. Maximum BER Count
The maximum number of errors the device can report is limited to 5.00E-04 in STS-12/STM-4 mode and 1.00E-04
in STS-48/STM-16 mode. This applies to the SDLSET, SDLCLEAR, SFLSET, and SFLCLEAR bits of the signal
degrade and signal fail BER algorithm OHP registers. These bits are shown in Table 8.
Table 8. Signal Degrade and Signal Fail Algorithm OHP Registers [6:3]
* The OHP prefix shown here will be added to the current bit names in revision 4 of the advance data
Workaround
This is informational only. No workaround is available for this condition.
Corrective Action
No corrective action is required for this condition.
OHP2. RDI-L Reporting
When the device is initially powered up, it defaults to STS-48/STM-16 mode. This locks a counter value into trans-
mit control registers for channels B, C, and D. When the device is configured for STS-3/STM-1 mode, the counter
does not automatically clear.
Workaround
During STS-3/STM-1 OHP configuration in the system code, manually clear transmit control registers 0x0431,
0x0433, and 0x0435 for channels B, C, and D. In order to clear these transmit control registers, the bits must be
toggled. The following pseudocode shows how to clear the bits on channels B, C, and D:
Set address 0x0431 to 0x007F # set bits on channel B
Set address 0x0431 to 0x0000 # clear bits on channel B
Set address 0x0433 to 0x007F # set bits on channel C
Set address 0x0433 to 0x0000 # clear bits on channel C
Set address 0x0435 to 0x007F # set bits on channel D
Set address 0x0435 to 0x0000 # clear bits on channel D
Corrective Action
This is informational only. No corrective action is required for this condition.
sheet.
OHP_SDLCLEAR[A—D][3:0]
OHP_SFLCLEAR[A—D][3:0]
OHP_SDLSET[A—D][3:0]
OHP_SFLSET[A—D][3:0]
OHP Bits*
0x043B, 0x043D, 0x043F, 0x0441
0x0447, 0x0449, 0x044B, 0x044D
0x0453, 0x0455, 0x0457, 0x0459
0x045F, 0x0461, 0x0463, 0x0465
Addresses
for Version 1 and 1A of the Device
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