參數(shù)資料
型號: XRT83L314IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA304
封裝: TBGA-304
文件頁數(shù): 38/84頁
文件大小: 631K
代理商: XRT83L314IB
XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
34
4.0
T1/E1 APPLICATIONS
This applications section describes common T1/E1 system considerations along with references to application
notes available for reference where applicable.
4.1
Loopback Diagnostics
The XRT83L314 supports several loopback modes for diagnostic testing. The following section describes the
local analog loopback, remote loopback, digital loopback, and dual loopback modes.
4.1.1
Local Analog Loopback
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 Figure 31.
F
IGURE
31. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
L
OCAL
A
NALOG
L
OOPBACK
N
OTE
:
The transmit diagnostic features such as TAOS, NLC generation, and QRSS take priority over the transmit input
data at TCLK/TPOS/TNEG.
4.1.2
Remote Loopback
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 Figure 32.
F
IGURE
32. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
R
EMOTE
L
OOPBACK
Encoder
Decoder
Timing
Control
Data and
Clock
Recovery
JA
JA
Tx
TAOS
NLC/PRBS/QRSS
TTIP
TRING
RTIP
RRING
TCLK
TPOS
TNEG
RCLK
RPOS
RNEG
Rx
Encoder
Decoder
Timing
Control
Data and
Clock
Recovery
JA
JA
Tx
Rx
TAOS
NLC/PRBS/QRSS
TTIP
TRING
RTIP
RRING
TCLK
TPOS
TNEG
RCLK
RPOS
RNEG
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