參數(shù)資料
型號: XRT86VL3X
廠商: Exar Corporation
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù): 26/149頁
文件大?。?/td> 1274K
代理商: XRT86VL3X
XRT86VL3X
19
T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
REV. 1.2.0
2.1.5
Framer Remote Line Loopback
The Framer Remote Line Loopback is almost identical to the LIU physical interface Remote Loopback. The
digital data enters the framer interface, however does not enter the framing blocks. The main difference
between the Remote loopback and the Framer Remote Line loopback is that the receive digital data from the
LIU is allowed to pass through the LIU Decoder/Encoder circuitry before returning to the line interface. A
simplified block diagram of framer remote line loopback is shown in
Figure 26
.
2.1.6
Framer Local Loopback
With framer local loopback activated, the transmit PCM input data is looped back to the receive PCM output
data. The receive input data at RTIP/RRING is ignored while an All Ones Signal is transmitted out to the line
interface. A simplified block diagram of framer remote line loopback is shown in
Figure 27
.
F
IGURE
26. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
F
RAMER
R
EMOTE
L
INE
L
OOPBACK
F
IGURE
27. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
F
RAMER
L
OCAL
L
OOPBACK
Encoder
Decoder
Timing
Control
Data and
Clock
Recovery
JA
JA
Tx
Rx
TAOS
NLC/PRBS/QRSS
TTIP
TRING
RTIP
RRING
Framer
Tx
Framer
Rx
Tx Serial
Clock
Rx Serial
Clock
S
2-Frame
Slip Buffer
Elastic Store
Tx Serial
Data In
Tx LIU
Interface
2-Frame
Slip Buffer
Elastic Store
Rx LIU
Interface
Rx Framer
Rx Serial
Data Out
Tx Framer
LLB
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