DS26303LN-120+ Maxim Integrated Products, DS26303LN-120+ Datasheet - Page 67

• Manufacturer Part Number: DS26303LN-120+
• Description: IC LIU E1/T1/J1 3.3V 144-ELQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS26303LN-120+

• Number Of Drivers/receivers: 8/8
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP Exposed Pad, 144-eLQFP, 144-HLQFP
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.8.4 Dual Loopback
A dual loopback is created by enabling both a remote loopback and a digital loopback. The transmit system data
TPOSn, TNEGn, and TCLKn are looped back to output on RCLKn, RPOSn, and RNEGn. The inputs at RTIPn and
RRINGn are looped back to TTIPn and TRINGn. This loopback is conceptually shown in
Figure 6-11. Dual Loopback
TCLK
TNEG
TPOS
RNEG
RCLK
RPOS
HDB3/
B8ZS
Encoder
B8ZS
HDB3/
Decoder
Attenuator
Attenuator
Optional
Optional
Jitter
Jitter
DS26303: 3.3V, T1/E1/J1, Short-Haul, Octal Line Interface Unit
67 of 101
Transmit
Digital
Receive
Digital
Transmit
Analog
Analog
Receive
Line
Driver
Figure
6-11.
RRING
RTIP
TPOS
TNEG