tmxf28155 ETC-unknow, tmxf28155 Datasheet - Page 417

• Manufacturer Part Number: tmxf28155
• Description: Tmxf28155 Super Mapper 155/51 Mbits/s Sonet/sdh X28/x21 Ds1/e1
• Manufacturer: ETC-unknow

Preliminary Data Sheet
May 2001
18 SPE Mapper Functional Description
Table 545. Signal Degrade Parameters
Note: The threshold written by the control system is one less than the desired number, except for the SPE_SDLSET[3:0]/SDLCLEAR[3 :0]
18.14.12 Signal Fail BER Algorithm
A signal fail state is reported by bit SPE_SFB3
(Table
Declaring the signal fail state requires the definition of two measurement windows, a monitoring block consisting of
a number of frames, Ns (SPE_SFNSSET[18:0]
of a number of monitoring blocks, B (SPE_SFBSET[15:0]
number of bit errors equals or exceeds a threshold, L (SPE_SFLSET[3:0] (v)). Signal fail is declared when the
number of bad monitoring blocks equals or exceeds the threshold, M (SPE_SFMSET[7:0]
measurement interval.
Clearing the signal fail state requires the definition of two measurement windows, a monitoring block consisting of a
number of frames, Ns (SPE_SFNSCLEAR[18:0]
of monitoring blocks, B (SPE_SFBCLEAR[11:0] (v)). A block is determined to be good when the number of bit
errors is less than a threshold, L (SPE_SFLCLEAR[3:0]
monitoring blocks equals or exceeds the threshold, M (SPE_SFMCLEAR[7:0] (v)), for the measurement interval.
The set parameters are used when the signal fail state is clear, and the clear parameters are used when the signal
fail state is declared.
The signal fail state may be forced to the declared state with bit SPE_SFSET
to the cleared state with bit SPE_SFCLEAR
The above algorithm can detect bit error rates from 1 x 10
Agere Systems Inc.
SPE_SDNSCLEAR[18:0]
SPE_SDBCLEAR[15:0]
SPE_SDMCLEAR[7:0]
SPE_SDNSSET[18:0]
SPE_SDLCLEAR[3:0]
SPE_SDBSET[15:0]
SPE_SDMSET[7:0]
SPE_SDLSET[3:0]
parameter.
SPE_SDCLEAR
146) with the interrupt mask bit SPE_SFB3M
SPE_SDB3M
SPE_SDSET
SPE_SDB3D
SPE_SDB3
Name
(Table
(Table
(Table
(Table
(Table
(Table
(Table
(Table
(Table
(Table
(Table
(Table
148)
(Table
145)
146)
147)
145)
158)
158)
158)
158)
158)
158)
158)
158) Signal Degrade Ns Clear. Number of frames in a monitoring block for SD.
Signal Degrade Ns Set. Number of frames in a monitoring block for SD.
Signal Degrade L Set. Error threshold for determining if a monitoring
block is bad.
Signal Degrade M Set. Threshold of the number of bad monitoring blocks
in an observation interval. If the number of bad blocks is below this thresh-
old, then SD is cleared.
Signal Degrade B Set. Number of monitoring blocks in a measurement
interval.
Signal Degrade L Clear. Error threshold for determining if a monitoring
block is bad.
Signal Degrade M Clear. Threshold of the number of bad monitoring
blocks in an observation interval. If the number of bad blocks is below this
threshold, then SD is cleared.
Signal Degrade B Clear. Number of monitoring blocks in a measurement
interval.
Signal Degrade Set. Allows the signal degrade algorithm to be forced into
the failed state (active 0 to 1).
Signal Degrade Clear. Allows the signal degrade algorithm to be forced
into the normal state (active 0 to 1).
Signal Degrade BER Algorithm State Bit.
Signal Degrade BER Algorithm Delta Bit.
Signal Degrade BER Algorithm Mask Bit.
(Table
(Table 148 on pag
(Table 159 on page146
(Table
145).
(Table
(continued)
159)), and a measurement interval consisting of a number
(Table
(Table
–3
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
147). This bit error rate algorithm operates on B3 errors.
to 1 x 10
159)). Signal fail is cleared when a number of good
159)). A block is determined to be bad when the
e137) and change of state in bit SPE_SFB3D
–9
.
)), and a measurement interval consisting
Function
TMXF28155/51 Super Mapper
(Table 145 on page134
(Table
159)), for the
) and forced
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