Bt8370/8375/8376
2.0 Circuit Description
2.8 Transmitter
Fully Integrated T1/E1 Framer and Line Interface
2.8 Transmitter
The Digital Transmitter (XMTR) inserts T1/E1 overhead data and encodes single
rail NRZ data from the TSB into P and N rail NRZ data, suitable for transmission
by the TLIU.
The XMTR, illustrated in Figure 2-28, consists of the following elements: two
Transmit Data Links, Test Pattern Generator, In-Band Loopback Code Generator,
Overhead Pattern Generator, Alarm Generator, Zero Code Suppression (ZCS)
Encoder, External Transmit Data Link, CRC Generation, Framing Pattern
Insertion, and Far End Block Error Generator.
Figure 2-28. XMTR Diagram
Line
Framer
Loopback Loopback
TCLK
Transmitter
Timebase
To TSBI
TNRZ
TPOS
TNEG
ZCS
Encoder
N8370DSE
Conexant
2-53