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TMPR28051 データシート(PDF) 8 Page - Agere Systems

部品番号 TMPR28051
部品情報  TMPR28051 STS-1/AU-3 (STM-0) Mapper Device Advisory for Version 5 of the Device
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TMPR28051 STS-1/AU-3 (STM-0) Mapper
Advisory, Rev. 2
Device Advisory for Version 3 of the Device
August 5, 1999
2
Lucent Technologies Inc.
Error Insertion (EI) (continued)
EI-3. False S-BIP, L-BIP, and P-BIP Error Insertion
The device transmits S-BIP, L-BIP, and P-BIP errors when configured for automatic insertion of REI, and certain
STS-1 error conditions such as LOS, LOF, LOP-P, S-BIP, L-BIP, and P-BIP are inserted.
EI-4. Forcing AIS Condition
In order to force AIS using the VTDROP bits, a value of 0x1D must be programmed for DS1 AIS, and a value of
0x1E must be programmed for E1 AIS.
VT Mapping (VT)
VT-1. VT Path Payload Label Mismatch
The device reports PLM-V when it detects three consecutive consistent new values for the VT label. This is in com-
pliance with G.783 Section 2.2.2.7 and T1.231 Section 8.1.3.5.2.4.2 specifications, but is not compliant with
GR-253 Section 6.2.1.1.8.C.
VT-2. Failure in the Detection of VT Loss of Pointer Defects
s
The device fails to detect an LOP-V defect or insert the required DS1/E1 AIS downstream when it receives VT
pointer words with the N bits continuously set to 1001 (i.e., with a continuously set NDF).
s
The device also apparently fails to detect an LOP-V defect when it continuously receives a VT pointer word of
6C68 (i.e., a value indicating a VT1.5 with an offset of 104 bytes, versus a maximum valid offset of 103 bytes). In
this case, the device inserts the required DS1 AIS downstream, but does not subsequently declare an LOP-V
failure (nonconformance to GR 253, R6-71).
VT-3. Inappropriate Termination of VT Loss of Pointer Defect Condition
After the device has detected an LOP-V defect, it inappropriately terminates that defect upon receiving two pointer
words containing the same value as the previous valid pointer. According to GR 253, an LOP-V defect must not be
terminated unless a valid pointer is received in three consecutive VT superframes (nonconformance to GR 253,
R6-75).
VT-4. Inappropriate Termination of VT Alarm Indication Signal Defect Condition
After the device has detected an AIS-V defect, it inappropriately terminates that defect upon receiving two pointer
words containing the same value as the previous valid pointer and without a set NDF (e.g., with the N bits set to
0110). According to GR 253, an AIS-V defect must not be terminated unless a normal valid pointer is received in
three consecutive VT superframes, or a valid pointer with a set NDF is received in one VT superframe (nonconfor-
mance to GR 253, R6-183).


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