Rainbow Electronics DS3170 - Manual (Page 2)

DS3170 DS3/E3 Single-Chip Transceiver
2 of 233
DETAILED DESCRIPTION
The DS3170 is a software-configured, DS3/E3, single-chip transceiver (SCT). The line interface unit (LIU) has
independent receive and transmit paths. The receiver LIU block performs clock and data recovery from a B3ZS- or
HDB3-coded AMI signal and monitors for loss of the incoming signal, and can be bypassed for direct clock and
data input. The receiver LIU block optionally performs B3ZS/HDB3 decoding. The transmitter LIU drives standard
pulse-shape waveforms onto 75
W coaxial cable and can be bypassed for direct clock and data output. The jitter
attenuator can be put in the transmit or receive data path when the LIU is enabled. Built-in DS3/E3 framers transmit
and receive data in properly formatted C-bit DS3, M23 DS3, G.751 E3 or G.832 E3 data streams. Functions not
used are powered down to reduce system power requirements. The DS3170 conforms to the telecommunications
standards listed in Section
3.2 .
1 BLOCK DIAGRAMS
Figure 1-1 shows the external components required at the LIU interface for proper operation. Figure 1-2 shows the
functional block diagram of the one channel DS3/E3 SCT.
Figure 1-1. LIU External Connections for the DS3/E3 Port of DS3170
1:2ct
1:2ct
Transmit
Receive
TXP
TXN
RXP
RXN
0.01uF
3.3V
Power
Plane
Ground
Plane
VDD
DS3/E3 LIU Interface
0.1uF 1uF
330 W
(1%)
330 W
(1%)
0.01uF 0.1uF 1uF
0.01uF 0.1uF 1uF
VDD
VDD
VSS
VSS
VSS