BT8376EPF datasheet(94/323 Pages) CONEXANT

Part #	BT8376EPF

Description	single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces

PDF	323 Pages

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Manufacturer	CONEXANT [Synaptics Incorporated.]

Direct Link	https://www.synaptics.com/

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94 / 323 page

2.0 Circuit Description

Bt8370/8375/8376

2.8 Transmitter

Fully Integrated T1/E1 Framer and Line Interface

2-66

Conexant

N8370DSE

The HDB3 line code replaces 4 consecutive 0s by 000V or B00V code, where

B is an AMI pulse and V is a bipolar violation (see Figure 2-32). ZCS encoder

selects the code that forces the BPV output polarity opposite to the prior BPV.

The B8ZS line code replaces strings of 8 consecutive 0s or no pulses with the

B8ZS octet 000VB0VB, where B represents a normal bipolar pulse and V

represents a BPV. A BPV that is not part of B8ZS octet is a BPV error.

B7ZS replaces Bit 7 of all assigned time slots with a 1 if the contents are all 0.

B7ZS encoding is enabled on a per-channel basis in the Transmit Per-Channel

Control register [TPC0 to TPC31; addr 100 to 11F].

PDV enforcer overwrites transmit 0s that would otherwise cause output data

to fail to meet the minimum required pulse density, per ANSI T1.403 sliding

window.

NOTE:

The enforcer never overwrites a framing bit and is not applicable during

E1 mode.

Figure 2-32. Zero Code Substitution Formats

BPV

Octet

AMI

B8ZS

HDB3

B7ZS

UMC

Zero Code Substitution Formats

BPV

BT8376EPF Datasheet(PDF) 94 Page - Synaptics Incorporated.