XRT83VSH314ES Exar, XRT83VSH314ES Datasheet - Page 34

• Manufacturer Part Number: XRT83VSH314ES
• Description: Peripheral Drivers & Components - PCIs 14 CHT1/E1LIUSH LOW COST VERSION
• Manufacturer: Exar

Specifications of XRT83VSH314ES

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

XRT83VSH314
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
This applications section describes common T1/E1 system considerations along with references to application
notes available for reference where applicable.
The XRT83VSH314 supports several loopback modes for diagnostic testing. The following section describes
the local analog loopback, remote loopback, digital loopback, and dual loopback modes.
With local analog loopback activated, the transmit output data at TTIP/TRING is internally looped back to the
analog inputs at RTIP/RRING. External inputs at RTIP/RRING are ignored while valid transmit output data
continues to be sent to the line. A simplified block diagram of local analog loopback is shown in
F
N
With remote loopback activated, the receive input data at RTIP/RRING is internally looped back to the transmit
output data at TTIP/TRING. The remote loopback includes the Receive JA (if enabled). The transmit input
data at TCLK/TPOS/TNEG are ignored while valid receive output data continues to be sent to the system. A
simplified block diagram of remote loopback is shown in
F
5.0 T1/E1 APPLICATIONS
5.1
5.1.1
5.1.2
IGURE
OTE
IGURE
: The transmit diagnostic features such as TAOS and QRSS take priority over the transmit input data at TCLK/TPOS/
TNEG.
20. S
21. S
Loopback Diagnostics
Local Analog Loopback
Remote Loopback
TNEG
RPOS
RNEG
TPOS
RCLK
TCLK
IMPLIFIED
IMPLIFIED
RPOS
RNEG
TPOS
TNEG
RCLK
TCLK
B
B
LOCK
LOCK
QRSS/PRBS
Encoder
Decoder
QRSS/PRBS
D
D
IAGRAM OF
IAGRAM OF
Decoder
Encoder
L
R
OCAL
EMOTE
JA
JA
JA
JA
A
NALOG
L
OOPBACK
31
Figure
Recovery
Data and
Control
Timing
Clock
L
Recovery
Data and
Control
Timing
OOPBACK
Clock
21.
TAOS
TAOS
Tx
Tx
Rx
Rx
RRING
TRING
RTIP
TRING
TTIP
TTIP
RRING
RTIP
Figure
REV. 1.0.1
20.