MH8910-1AC 데이터 시트보기 (PDF) - Mitel Networks

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MH8910-1AC

Digital Subscriber Line Interface Circuit

Mitel Networks 

MT8910-1

Preliminary Information

• TL:

A 10 kHz activation tone sourced by the

LT which is generated by sending a

continuous pattern of four +3 symbols

followed by four -3 symbols.

• SL0: SL0 is a no signal condition generated

from the LT.

• SL1: An LT generated signal consisting of a

framed (but not superframed),

scrambled 2B1Q signal which carries all

1s in the B-, D- and M-channels. This

signal is used to train the LT’s echo

canceller.

• SL2: An LT generated signal consisting of a

fully framed and superframed

scrambled 2B1Q signal which carries all

0s in the B- and D-channels with

information in the M-channel. This

signal is used to train the NT’s DFE.

• SL3: An LT generated signal consisting of a

fully framed and superframed scrambled

2B1Q signal which carries information in

all the B-, D- and M-channels.

MRST Pin

Full Reset

(Power down

Tx-SNO

RCV TL or

LAR

ST.T0

Alerting

Tx-TN (9 ms)

ST.Tx = Start Timer x

STP.Tx = Stop Timer x

LAR = Local Activation Request

LDR = Local Deactivation Request

SFS = Superframe Synchronization Acquired

Expiry of T2

RCV Reset

Tx-SN0

RCV TL

ST.T0

STP.T2

Loss of signal

STP.T3

ST.T2

Expiry of T1

EC Training

Tx-SN1

Expiry of T0

EC

Converged

ST.T1

Quiet

Tx-SN0

Expiry of T0

Signal

Detected

STP.T1

Train

DFE/Timing

Tx-SN0

Expiry of T0

SL2

Detected

Framing

Tx-SN2

Loss of

far-end

signal

STP.T3

ST.T2

Expiry

of T3

SFS

ST.T3

ST.T3

T0 = 15 sec timer

T1 = 480 ms timer

T2 = 40 ms timer

T3 = 520 ms timer

Note1: Loss of received signal will

result in a loss of sync.

Active

Tx-SN3

LDR

ST.T3

Pending Deact.

Tx-SN3

Loss of BFS > 480ms1

ST.T3

Tear Down

Tx-SN0

Figure 6b - Activation/Deactivation State Diagram - NT Mode

9-10

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