BT8376EPF datasheet(195/323 Pages) CONEXANT

195 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.12 Transmitter Registers

N8370DSE

Conexant

3-77

AUTO_AIS /TAIS

Automatic Manual Transmit Alarm Indication Signal—When activated manually (TAIS) or

automatically (AUTO_AIS), the alarm formatter replaces all data output on TPOSO/TNEGO

and XTIP/XRING with an unframed all-1s signal (AIS). This includes replacing data supplied

from TPOSI/TNEGI and from the receiver during line loopback [LLOOP; addr 014].

Automatic mode sends AIS for the duration of receive loss of signal [RLOS; addr 047] or

receive loss of clock [RLOC; addr 047], depending on the analog or digital line interface

option [RDIGI; addr 020]. If AISCLK [addr 068] is enabled, TAIS also provides manual

switch control over ACKI clock input. AUTO_AIS does not affect ACKI switching.

AIS transmission [TAIS, AUTO_AIS; addr 075, or AISCLK; addr 068] does not affect

transmit data that is looped back to the receiver during framer loopback [FLOOP; addr 014].

This allows both FLOOP and LLOOP to be active simultaneously during loss of signal,

without disrupting data in the framer loopback path.

076—Transmit Test Pattern Configuration (TPATT)

TPSTART

Enable Test Pattern Transmission.

FRAMED

PRBS Framed—When set, the PRBS pattern does not overwrite framing bit positions and is

stopped during these bit periods. In T1 mode, the frame bit (every 193rd bit) is not overwritten.

In E1 mode, the PRBS test pattern is not written to time slot 0 (FAS and NFAS words) and

time slot 16 (CAS signalling word) if CAS framing is also selected. CAS framing is selected

by setting TFRAME[3] to 1 in the Transmit Configuration register [TCR0; addr 070]. If

FRAMED is disabled, the test pattern is transmitted in all time slots.

ZLIMIT

Enable 0 Limit; 7/14 depending on pattern.

TAIS

AUTO_AIS

AISC

Transmit Data

Transmit Clock

(TCKO)

Normal, No AIS

TCKI

AIS during TLOC

ACKI while TLOC

AIS During RLOS/RLOC

TCKI

AIS During TLOC or RLOS

ACKI while TLOC

Manual AIS

TCKI

Manual AIS and ACKI

ACKI

NOTE:

Systems that transmit framed all ones can utilize inband loopback code generator

[TLB; addr 077] to send all ones in payload only.

———

TPSTART

FRAMED

ZLIMIT

TPATT[1]

TPATT[0]

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