xrt73r06 Exar Corporation, xrt73r06 Datasheet - Page 22

• Manufacturer Part Number: xrt73r06
• Description: Six Channel Ds3/e3 Line Interface Unit Liu With R3 Technologytm
• Manufacturer: Exar Corporation

XRT73R06
REV. 1.0.0
The transmitter is designed so that the LIU can accept serial data from a local device, encode the data
properly, and then output an analog pulse according to the pulse shape chosen in the appropriate registers.
This section describes the detailed operation of various blocks within the transmit path. A simplified block
diagram of the transmit path is shown in Figure 6.
F
The method for applying data to the transmit inputs of the LIU is a serial interface consisting of TxClk, TxPOS,
and TxNEG. For single rail mode, only TxClk and TxPOS are necessary for providing the local data from a
Framer device or ASIC. Data can be sampled on either edge of the input clock signal by programming the
appropriate register. A typical interface is shown in Figure 7.
F
3.0 THE TRANSMITTER SECTION
3.1
IGURE
IGURE
TRing_n
MRing_n
TTIP_n
MTIP_n
DMO_n
6. T
7. T
Transmit Digital Input Interface
RANSMIT
YPICAL INTERFACE BETWEEN TERMINAL EQUIPMENT AND THE
P
ATH
Monitor
Device
Driver
(E3/DS3 or STS-1
Line
B
Equipment
LOCK
Terminal
Framer)
D
Shaping
Control
Pulse
IAGRAM
Tx
Tx
T x P O S
T x N E G
TxLineClk
Control
Timing
SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
19
TPData
TNData
TxClk
Exar E3/DS3/STS-1 LIU
Attenuator
Jitter
Transmit
Logic
Block
MUX
XRT73R06 (
Channel n
Encoder
HDB3/
B3ZS
DUAL
-
RAIL DATA
áç
áç
áç
áç
TxClk_n
TxPOS_n
TxNEG_n
TxON
)