BT8376EPF datasheet(33/323 Pages) CONEXANT

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Bt8370/8375/8376

2.0 Circuit Description

Fully Integrated T1/E1 Framer and Line Interface

2.2 Receive Line Interface Unit

N8370DSE

Conexant

2-5

2.2 Receive Line Interface Unit

The Receive Line Interface Unit (RLIU) recovers clock and data from the bipolar

Alternate Mark Inversion (AMI) line signal that has been attenuated and distorted

due to the characteristics of the line. In the Bt8370 device, the RLIU is sensitive

to signals attenuated in the range of 0 to –48 dB in E1 and T1 modes. In the

Bt8375 and Bt8376 devices, RLIU sensitivity is limited for short-haul only

applications. In addition, the RLIU interfaces at the DSX-1 Bridge Monitor Level

(–20 dB for DS1 and –30 dB for E1/CEPT).

The RLIU converts AMI pulses into P and N rail Non-Return to 0 (NRZ) data.

The AMI pulses are input on the receive tip and ring pins: RTIP and RRING

(Figure 2-4). The P and N rail NRZ data is then passed to the RCVR. The RCVR

dual rail output is available on RPOSO/RNEGO. Figure 2-5 illustrates the

relationship between the AMI received signal, the recovered clock, and the

RCVR dual rail outputs.

Figure 2-4. RLIU Diagram

Adaptive

Equalizer

ADC

VGA

Data

Slicer

RPLL

RCKI

RTIP

RRING

RPOSO

RNEGO

To JAT From JAT

Analog Loopback

RNEGI

RPOSI

RNEGI

RPOSI

ALOOP

RDIGI

RJAT

RXCLK

ADC

BT8376EPF 数据表(PDF) 33 Page - Synaptics Incorporated.

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