DS26518GN+ Maxim Integrated Products, DS26518GN+ Datasheet - Page 97

• Manufacturer Part Number: DS26518GN+
• Description: IC TXRX T1/E1/J1 8PORT 256-CSBGA
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of DS26518GN+

• Number Of Drivers/receivers: 8/8
• Protocol: T1/E1/J1
• 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

9.12.6 LIU Loopbacks
The DS26518 provides four LIU loopbacks for diagnostic purposes: Analog Loopback, Local Loopback, Remote
Loopback 1, and Remote Loopback 2. Dual Loopback is a combination of Local Loopback and Remote Loopback
1. In the loopback diagrams that follow, TSERn, TCLKn, RSERn, and RCLKn are inputs/outputs from the framer.
Figure 9-28. Loopback Diagram
9.12.6.1
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. This is shown in the
Figure 9-29. Analog Loopback
RRING
TRING
MCLK
RTIP
TTIP
TCLK
TSER
RCLK
RSER
Analog Loopback
Transmit
Framer
Receive
Framer
Master Clock
RX LIU
TX LIU
PLL
Optional
Jitter
Attenuator
Optional
Jitter
Attenuator
97 of 312
JACLK
Transmit
Digital
receive path
Attenuator
assigned to
Attenuator
or transmit
(in RX path)
Attenuator
Receive
Digital
(in TX path)
disabled
can be
path or
Jitter
Jitter
Jitter
Transmit
Analog
Receive
Analog
Figure
TX FORMATTER
9-29.
RX FRAMER
Line
Driver
TTIP
TRING
RTIP
RRING
TCLK
TSER
RCLK
RSER