BT8370KPF Conexant Systems, Inc., BT8370KPF Datasheet - Page 94

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BT8370KPF

Manufacturer Part Number
BT8370KPF
Description
Fully integrated T1/E1 framer and line interface
Manufacturer
Conexant Systems, Inc.
Datasheet

Specifications of BT8370KPF

Case
QFP
2.0 Circuit Description
2.8 Transmitter
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
selects the code that forces the BPV output polarity opposite to the prior BPV.
Figure 2-32. Zero Code Substitution Formats
AMI
B8ZS
HDB3
B7ZS
UMC
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:
2-66
Fully Integrated T1/E1 Framer and Line Interface
Zero Code Substitution Formats
Octet
1
1
0
0
0
0
BPV
BPV
The enforcer never overwrites a framing bit and is not applicable during
E1 mode.
Conexant
Bt8370/8375/8376
Figure
2-32). ZCS encoder
0
0
0
1
0
1
BPV
BPV
N8370DSE

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