PM5366-PI datasheet(171/267 Pages) PMC

171 / 267 page

PRELIMINARY

PM5366 TEMAP-84

DATASHEET

PMC-2010672

ISSUE 1

HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

159

Figure 14

- CRCE Count vs. BER (E1 mode)

1.00E-07

1.00E-06

1.00E-05

1.00E-04

1.00E-03

1.00E-02

200

400

600

800

1000

1200

CRCE

Figure 15 illustrates the expected count values for a range of Bit Error Ratios in

T1 mode.

Figure 15

- FER Count vs. BER (T1 ESF mode)

100

150

200

250

Average Count Over

Many 1 Second Intervals

Framing Bit Error Count Per Second

Since the maximum number of ESF superframes that can occur in one second is

333, the 9-bit BEE counter cannot saturate in one second in ESF framing format.

Despite this, there is not a linear relationship between BER and BEE count, due

to the nature of the CRC-6 calculation. At BERs below 10-4, there tends to be no

more than one bit error per superframe, so the number of CRC-6 errors is

generally equal to the number of bit errors, which is directly related to the BER.

However, at BERs above 10-4, each CRC-6 error is often due to more than one

bit error. Thus, the relationship between BER and BEE count becomes non-

linear above a 10-4 BER. This must be taken into account when using ESF

CRC-6 counts to determine the BER.

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