MT9072AB 查看數據表（PDF） - Zarlink Semiconductor Inc

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MT9072AB

Octal T1/E1/J1 Framer

Zarlink Semiconductor Inc 

MT9072

Data Sheet

Framing Algorithm

T1/J1 Mode

• Synchronizes with D4 or ESF protocols

• Supports T1DM synchronization with the D4

pattern and timeslot 24 T1DM Sychronization

bytes

• Framing circuit is off-line

• Transparent transmit and receive mode

• In D4 mode Fs bits can be optionally cross

checked with the Ft bits

• The start of the ESF multiframe can be

determined by the following methods:

• Free-run

• Software reset

• Synchronized to the incoming multiframe

• An automatic reframe is initiated if the framing

bit error density exceeds the programmed

threshold

• In transparent mode no reframing is forced by

the device

• Software can force a reframe at any time

• In ESF mode the CRC-6 bits can be optionally

confirmed before forcing a new frame

alignment

• During a reframe the signaling bits are frozen,

and error counting for Ft, Fs, ESF framing

pattern and CRC-6 bits is suspended

• If J1 CRC-6 is selected the Fs bits are included

in the CRC-6 calculation

• J1-CRC-6 and J1-Yellow Alarm can be

independently selected

• Supports Robbed Bit Signaling

• Optional forced ones insertion

E1 Mode

• Three distinct and independent E1 framing

algorithms

1. Basic frame alignment

2. Signaling multiframe alignment

3. CRC-4 multiframe alignment

• Transparent receive mode

• Transparent transmit mode

• Optional automatic interworking between

interfaces with and without CRC-4 processing

capabilities is supported

• An automatic reframe is forced if 3

consecutive frame alignment patterns or three

consecutive non-frame alignment bits are

received in error

• In receive transparent mode no reframing is

forced by the device

• Software can force a reframe at any time

• Software can force a multiframe reframe at

any time

• E-bits can optionally be set to zero or one until

CRC synchronization is achieved

• Optional automatic RAI

• Supports CAS multiframing

• Optional automatic Y-bit to indicate CAS

multiframe alignment

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Zarlink Semiconductor Inc.

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