XRT83VSH28ES Exar, XRT83VSH28ES Datasheet - Page 34

• Manufacturer Part Number: XRT83VSH28ES
• Description: Peripheral Drivers & Components - PCIs 8 CH E1 LIU SH (low cost version)
• Manufacturer: Exar

Specifications of XRT83VSH28ES

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

XRT83VSH28
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
The driver monitor circuit is used to detect transmit driver failures by monitoring the activities at TTIP/TRING
outputs. Driver failure may be caused by a short circuit in the primary transformer or system problems at the
transmit inputs. If the transmitter of a channel has no output for more than 128 clock cycles, DMO goes "High"
until a valid transmit pulse is detected. If the DMO interrupt is enabled, the change in status of DMO will cause
the interrupt pin to go "Low". Once the status register is read, the interrupt pin will return "High" and the status
register will be reset (RUR).
The output stage of the transmit path generates standard return-to-zero (RZ) signals to the line interface for E1
twisted pair or E1 coaxial cable. 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 transmitter outputs only require one DC blocking capacitor of
0.68
appropriate channel register. A typical transmit interface is shown in
F
3.6
3.7
IGURE

F. For redundancy applications (or simply to tri-state the transmitters), set TxTSEL to a "1" in the
18. T
DMO (Digital Monitor Output)
Line Termination (TTIP/TRING)
YPICAL
C
ONNECTION
Transmitter
D
Output
IAGRAM
Internal Impedance
XRT83VSH28 LIU
U
T
T
RING
TIP
SING
I
NTERNAL
C=0.68uF
31
One Bill of Materials
T
ERMINATION
1:2
Figure
Line Interface E1
18.
REV. 2.0.0