MT9076AB Просмотр технического описания (PDF) - Mitel Networks

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производитель

MT9076AB

T1/E1/J1 3.3V Single Chip Transceiver

Mitel Networks 

Preliminary Information

dB

-0.5

0

19.5

MT9076

-20 dB/decade

10

40

400

10K

Frequency (Hz)

Figure 11 - TR 62411 Jitter Attenuation Curve

2.0 Clock Jitter Attenuation Modes

MT9076 has three basic jitter attenuation modes of operation, selected by the BS/LS and S/FR/Exclki control

pins.

• System Bus Synchronous Mode

• Line Synchronous Mode

• Free-run mode

Depending on the mode selection above, the PLL can either attenuate transmit clock jitter or the receive clock

jitter. Table 5 shows the appropriate configuration of each control pin to achieve the appropriate mode and

Jitter attenuation capability of the MT9076.

Mode Name

BS/LS

S/FR/Exclki

Note

System Bus Synchronous

1

1

PLL locked to C4b.

Line Synchronous

0

1

PLL locked to Exclk.

Free-Run

x

0

PLL free - running.

Table 5 - Selection of clock jitter attenuation modes using the M/S and MS/FR pins

In System Bus Synchronous mode, pins C4b and F0b are always configured as inputs, while in the Line

Synchronous and Free-Run modes C4b and F0b are configured as outputs.

Referring to the mode names given in Table 5 the basic operation of the jitter attenuation modes are:

• In System Bus Synchronous mode an external clock is applied to C4b. The applied clock is dejittered by

the internal PLL before being used to synchronize the transmitted data. The clock extracted (with no

jitter attenuation performed) from the receive data can be monitored on pin Exclk.

23

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