XRT83SH314ES Exar, XRT83SH314ES Datasheet - Page 20

• Manufacturer Part Number: XRT83SH314ES
• Description: Peripheral Drivers & Components - PCIs 14 CHT1/E1LIU SH
• Manufacturer: Exar

Specifications of XRT83SH314ES

• Product Category: Peripheral Drivers & Components - PCIs
• Rohs: yes

XRT83SH314
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
The input stage of the receive path accepts standard T1/E1/J1 twisted pair or E1 coaxial cable inputs through
RTIP and RRING. The physical interface is optimized by placing the terminating impedance inside the LIU.
This allows one bill of materials for all modes of operation reducing the number of external components
necessary in system design. The receive termination impedance (along with the transmit impedance) is
selected by programming TERSEL[1:0] to match the line impedance. Selecting the internal impedance is
shown in
The XRT83SH314 has the ability to switch the internal termination to "High" impedance by programming
RxTSEL in the appropriate channel register. For internal termination, set RxTSEL to "1". By default, RxTSEL
is set to "0" ("High" impedance). For redundancy applications, a dedicated hardware pin (RxTSEL) is also
available to control the receive termination for all channels simultaneously. This hardware pin takes priority
over the register setting if RxTCNTL is set to "1" in the appropriate global register. If RxTCNTL is set to "0", the
state of this pin is ignored. See
F
2.1
2.1.1
IGURE
4. T
Line Termination (RTIP/RRING)
Table
CASE 1: Internal Termination
YPICAL
2.
Internal Impedance
XRT83SH314 LIU
C
ONNECTION
Receiver
T
Figure 4
TERSEL[1:0]
D
Input
ABLE
IAGRAM
0h (00)
1h (01)
2h (10)
3h (11)
2: S
R
for a typical connection diagram using the internal termination.
R
U
RING
ELECTING THE
TIP
SING
I
NTERNAL
16
I
NTERNAL
T
One Bill of Materials
ERMINATION
R
ECEIVE
1:1
I
MPEDANCE
100Ω
120Ω
110Ω
75Ω
T
ERMINATION
Line Interface T1/E1/J1
REV. 1.0.4