bt8375kpf Conexant Systems, Inc., bt8375kpf Datasheet - Page 33

• Manufacturer Part Number: bt8375kpf
• Description: Single Chip Transceivers For T1/e1 And Integrated Service Digital Network Isdn Primary Rate Interfaces Systems
• Manufacturer: Conexant Systems, Inc.

Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
Figure 2-4. RLIU Diagram
N8370DSE
RRING
RPOSI
RPOSI
RNEGI
RNEGI
RCKI
RTIP
Analog Loopback
ALOOP
O
1
VGA
ADC
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 AMI pulses are input on the receive tip and ring pins: RTIP and RRING
(Figure
dual rail output is available on RPOSO/RNEGO.
relationship between the AMI received signal, the recovered clock, and the
RCVR dual rail outputs.
The RLIU converts AMI pulses into P and N rail Non-Return to 0 (NRZ) data.
ADC
2-4). The P and N rail NRZ data is then passed to the RCVR. The RCVR
Conexant
Equalizer
Adaptive
Slicer
RPLL
Data
RDIGI
Figure 2-5
O
O
1
1
To JAT From JAT
2.2 Receive Line Interface Unit
2.0 Circuit Description
illustrates the
RJAT
O
1
RPOSO
RNEGO
RXCLK
2-5