DS26528GN+ Maxim Integrated Products, DS26528GN+ Datasheet - Page 84
DS26528GN+
Manufacturer Part Number
DS26528GN+
Description
IC TXRX T1/E1/J1 OCT 256-CSBGA
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet
1.DS26528G.pdf
(276 pages)
Specifications of DS26528GN+
Number Of Drivers/receivers
4/4
Protocol
IEEE 1149.1
Voltage - Supply
3.135 V ~ 3.465 V
Mounting Type
Surface Mount
Package / Case
256-CSBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8.11.5 LIU Loopbacks
The DS26528 provides four LIU loopbacks for diagnostic purposes: analog loopback, local loopback, remote
loopback, and dual loopback. In the loopback diagrams that follow, TSER, TCLK, RSER, and RCLK are
inputs/outputs from the framer. Note that the framer input/output can be in IBO mode where a single TSER/RSER
can be shared by up to eight framers.
8.11.5.1
The analog output of the transmitter TTIP and TRING is looped back to RTIP and RRING of the receiver. Data at
RTIP and RRING is ignored in analog loopback. This is shown in
Figure 8-16. Analog Loopback
8.11.5.2
The transmit system data (the internal signals TPOS, TNEG, and TCLK) is looped back to receive-side inputs to
the receive jitter attenuator. The data is also output on TTIP and TRING. Signals at RTIP and RRING are ignored.
Signals at RTIP and RRING are ignored. This loopback is conceptually shown in
Figure 8-17. Local Loopback
TSER
TCLK
RSER
RCLK
TCLK
TSER
RCLK
RSER
TRANSMIT
RECEIVE
FRAMER
FRAMER
Analog Loopback
Local Loopback
TRANSMIT
FRAMER
RECEIVE
FRAMER
ATTENUATOR
ATTENUATOR
OPTIONAL
OPTIONAL
JITTER
JITTER
ATTENUATOR
ATTENUATOR
OPTIONAL
OPTIONAL
JITTER
JITTER
TRANSMIT
DIGITAL
84 of 276
RECEIVE
DIGITAL
TRANSMIT
DIGITAL
RECEIVE
DIGITAL
TRANSMIT
ANALOG
TRANSMIT
RECEIVE
ANALOG
RECEIVE
ANALOG
ANALOG
Figure
8-16.
LINE
DRIVER
DS26528 Octal T1/E1/J1 Transceiver
LINE
DRIVER
Figure
RRING
RTIP
TRING
TTIP
8-17.
RTIP
RRING
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