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Data service unit (DSU) and channel service unit (CSU) functionality
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Ports configurable as clear channel T1 interfaces with 1.544-Mbps connectivity
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Framing: Superframe (SF or D4) and Extended Superframe (ESF)
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Supports B8ZS (bipolar 8-zero substitution) and AMI (alternate mark inversion) line coding
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Local, remote, and payload loopback testing
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ANSI T1.403 loopback support:
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Responds to embedded loopback commands upon receipt of an FDL command
from remote end with loopup and loopdown at both line and payload level
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Insertion of loopback commands enables remote CSU/NIU/Smartjack to enter
loopback and loopdown at both the line and payload level (ANSI and Telcordia)
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Inband loopback support:
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Responds to inband loopback commands at both the line and payload level (ANSI
and Telcordia)
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Insertion of inband loopback commands at both the line and payload level (ANSI
and Telcordia)
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Clocking support of external (line) and internal
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Buildout support of the following ranges:
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0 through 132 (Line buildout is from 1 through 132 feet)
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133 through 265 (Line buildout is from 133 through 265 feet)
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266 through 398 (Line buildout is from 266 through 398 feet)
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399 through 531 (Line buildout is from 399 through 531 feet)
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532 through 655 (Line buildout is from 532 through 655 feet)
Hardware features
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Quality of service (QoS) per channel: weighted round-robin (WRR), random early detection
(RED), weighted random early detection (WRED)
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SNMP: T1 MIB and DS0 MIB
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Dynamic, arbitrary channel configuration
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Full bit error rate test (BERT) patterns at T1 and DS0 levels
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Encapsulations:
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High-Level Data Link Control (HDLC)
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Frame Relay
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Circuit cross-connect (CCC)
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Translational cross-connect (TCC)
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Point-to-Point Protocol (PPP)
Software features
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120-ohm RJ-48C connector (female)Cables and connectors
One tricolor per port:
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Off—Not enabled
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Green—Online with no alarms or failures
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Amber—Online with alarms for remote failures
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Red—Active with a local alarm; router has detected a failure
LEDs
46 ■ Channelized T1 IQ PIC
M120 Internet Router PIC Guide