DS26303LN-120+A3 Maxim Integrated Products, DS26303LN-120+A3 Datasheet - Page 65
DS26303LN-120+A3
Manufacturer Part Number
DS26303LN-120+A3
Description
Buffers & Line Drivers 3.3V E1/T1/J1 Short Haul Octal LIU
Manufacturer
Maxim Integrated Products
Datasheet
1.DS26303LN-120A3.pdf
(101 pages)
Specifications of DS26303LN-120+A3
Lead Free Status / Rohs Status
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6.7 G.772 Monitor
In this application, only seven LIUs are functional and one LIU is used for nonintrusive monitoring of input and
output of the other seven channels. Channel 1 is used for monitoring channels 2 to 8. G.772 monitoring is
configured by the
remote loopback and the monitored signal can be output on TTIP1 and TRING1.
6.8 Loopbacks
The DS26303 provides four loopbacks for diagnostic purposes: analog loopback (ALBC:ALBCn set), digital
loopback (DLBC:DLBCn set), remote loopback (RLBC:RLBCn set), and dual loopback (DLBC:DLBCn set and
(RLBC:RLBCn set).
6.8.1
The analog output of the transmitter TTIPn and TRINGn is looped back to RTIPn and RRINGn of the receiver. Data
at RTIPn and RRINGn is ignored in analog loopback. See
Figure 6-8. Analog Loopback
6.8.2
The transmit system data TPOSn, TNEGn, and TCLKn are looped back to output on RCLKn, RPOSn, and RNEGn.
The data input at TPOSn and TNEGn is encoded and output on TTIPn and TRINGn. Signals at RTIPn and
RRINGn are ignored. This loopback is conceptually shown in
TCLK
TNEG
TPOS
Analog Loopback
Digital Loopback
RNEG
RPOS
RCLK
H D B 3 /
B 8 Z S
D e c o d e r
GMC
H D B 3 /
B 8 Z S
E n c o d e r
register (see
Table
O p t i o n a l
J i t t e r
A t t e n u a t o r
O p t i o n a l
J i t t e r
A t t e n u a t o r
5-9). While monitoring with channel 1, the device can be configured in
DS26303: 3.3V, T1/E1/J1, Short-Haul, Octal Line Interface Unit
65 of 101
Figure
T r a n s m i t
D i g i t a l
R e c e i v e
D i g i t a l
Figure
6-8.
6-9.
T r a n s m i t
A n a l o g
R e c e i v e
A n a l o g
Line
Driver
Rtip
Rring
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