XRT83VSH28IB-F View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83VSH28IB-F' PDF : 74 Pages View PDF
REV. P1.0.0
EQC[4:0]
0x1Ch
0x1Dh
PRELIMINARY
XRT83VSH28
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
TABLE 19: CABLE LENGTH SETTING
E1 MODE/RECEIVE SENSITIVITY
TRANSMIT LBO
E1 Short Haul/15dB
ITU G.703
E1 Short Haul/15dB
ITU G.703
CABLE
75Ω Coax
120Ω TP
CODING
HDB3
HDB3
TABLE 20: MICROPROCESSOR REGISTER 0X01H BIT DESCRIPTION
BIT
NAME
CHANNEL 0-7 (0X01H-0X71H)
FUNCTION
Register
Type
Default
Value
(HW reset)
D7
RxTSEL Receive Termination Select
R/W
0
Upon power up, the receiver is in "High" impedance. RxTSEL is
used to switch between the internal termination and "High" imped-
ance.
0 = "High" Impedance
1 = Internal Termination
D6
TxTSEL Transmit Termination Select
R/W
0
Upon power up, the transmitter is in "High" impedance. TxTSEL is
used to switch between the internal termination and "High" imped-
ance.
0 = "High" Impedance
1 = Internal Termination
D5
TERSEL1 Receive Line Impedance Select
D4
TERSEL0 TERSEL[1:0] are used to select the line impedance for E1.
R/W
1
0
TERSEL1
0
0
1
1
TERSEL0
0
1
0
1
LINE IMPEDANCE
Reserved
Reserved
75Ω
120Ω
D3
JASEL1 Jitter Attenuator Select
R/W
0
D2
JASEL0 JASEL[1:0] are used to select the jitter attenuator in the transmit or
receive path. By default, the jitter attenuator is disabled.
JASEL1 JASEL0
0
0
0
1
1
0
1
1
JA PATH
Disabled
Transmit Path
Receive Path
Receive Path
52
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