Line Codes Configurable for E1 PRI Controller
Question
Which two types of line codes are configurable for an E1 PRI controller on a Cisco IOS router? (Choose two.)
Answers
Explanations
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A. B. C. D. E. F.BD.
Configuring an NM-xCE1T1-PRI Card for an E1 Interface Perform this task to select and configure an NM-xCE1T1-PRI network module card as E1
SUMMARY STEPS - 1
enable 2
configure terminal 3
card type e1 slot 4
controller e1 slot / port 5
linecode {ami | hdb3} 6
framing {crc4 | no-crc4} References: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/12-4/ir-12-4-book/ir-12-port-chann-nm.html.
E1 (European standard) Primary Rate Interface (PRI) is a digital telecommunications interface that carries voice and data traffic over T-carrier lines. In Cisco IOS routers, the E1 PRI controller supports different types of line codes that can be configured for signaling and transmission purposes.
The two types of line codes that can be configured for an E1 PRI controller on a Cisco IOS router are:
B8ZS (Binary 8 Zero Suppression): It is a bipolar line code used to transmit data over T1 or E1 lines. B8ZS encodes eight consecutive zeros with a special sequence of bits that changes the polarity of the signal. This technique reduces the density of zeros in the signal, preventing the loss of synchronization in the receiver. B8ZS is commonly used in North America and Japan.
HDB3 (High-Density Bipolar 3-Zero): It is a bipolar line code used to transmit data over T1 or E1 lines. HDB3 replaces a sequence of four consecutive zeros with a special sequence of bits that changes the polarity of the signal. This technique reduces the density of zeros in the signal, preventing the loss of synchronization in the receiver. HDB3 is commonly used in Europe, Australia, and Asia.
The other line codes mentioned in the answer choices are not configurable for an E1 PRI controller on a Cisco IOS router. CRC4 (Cyclic Redundancy Check 4) is a method for error detection in the framing of E1 signals. ESF (Extended Superframe) and SF (Superframe) are framing formats for T1 and E1 signals, not line codes. AMI (Alternate Mark Inversion) is a bipolar line code used in T1 lines, not E1 lines.
