TMPR28051 datasheet(13/90 Pages) AGERE

13 / 90 page

Advisory, Rev. 2

TMPR28051 STS-1/AU-3 (STM-0) Mapper

August 5, 1999

Device Advisory for Version 4 of the Device

Lucent Technologies Inc.

VT Mapping (VT) (continued)

VT-5. C-Bit Decoding

In the presence of a receive SONET/SDH bit error rate, the device may destuff the DS1 from the VT1.5 incorrectly.

This is the result of an error in the VT1.5 C-bit decoding process. The C-bit decoding process should be capable of

correcting single errors to the C bits. Because of this error, an error in the first or second C bit for position 2 will be

incorrectly decoded if the first C-bit position is calling for a stuff and the second C-bit position is not. The end result

of this error is that both positions will call for a stuff, resultin g in a bit being removed from the DS1 data stream. This

will force downstream equipment to experience a reframe.

The minimum time to false decode severity is as shown in Table VT-5 (in terms of seconds to false decode).

Table VT-5. Minimum Time (in Seconds) to

False Decode Severity of the C Bit

In the absence of an external bit error rate, the algorithm decodes these C bits correctly.

Device Version (DV)

DV-1. Device Version Report

The device version register, 0x16, reports the device version as 0x03.

AY99-028SONT-2 Replaces AY99-028SONT to Incorporate the Following Updates

Added issues RA-5 and E1-3 to the document.

BER

Theoretical

Actual

–3

125

0.25

10–4

12500

2.5

10–5

1250000

–6

1.25e+8

250

10–7

1.25e+10

2500

10–8

1.25e+12

2.5e+4

10–9

1.25e+14

2.5e+5

–10

1.25e+16

2.5e+6

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