Juniper Networks M120 manual Framing Superframe SF or D4 and Extended Superframe ESF

M120 Internet Router PIC Guide

Hardware features	■	Data service unit (DSU) and channel service unit (CSU) functionality
	■ Ports configurable as clear channel T1 interfaces with 1.544-Mbps connectivity
	■ Framing: Superframe (SF or D4) and Extended Superframe (ESF)
	■ Supports B8ZS (bipolar 8-zero substitution) and AMI (alternate mark inversion) line coding
	■ Local, remote, and payload loopback testing
	■ ANSI T1.403 loopback support:
		■ Responds to embedded loopback commands upon receipt of an FDL command
		from remote end with loopup and loopdown at both line and payload level
		■ Insertion of loopback commands enables remote CSU/NIU/Smartjack to enter
		loopback and loopdown at both the line and payload level (ANSI and Telcordia)
	■	Inband loopback support:
		■ Responds to inband loopback commands at both the line and payload level (ANSI
		and Telcordia)
		■ Insertion of inband loopback commands at both the line and payload level (ANSI
		and Telcordia)
	■ Clocking support of external (line) and internal
	■ Buildout support of the following ranges:
		■ 0 through 132 (Line buildout is from 1 through 132 feet)
		■ 133 through 265 (Line buildout is from 133 through 265 feet)
		■ 266 through 398 (Line buildout is from 266 through 398 feet)
		■ 399 through 531 (Line buildout is from 399 through 531 feet)
		■ 532 through 655 (Line buildout is from 532 through 655 feet)
Software features	■	Quality of service (QoS) per channel: weighted round-robin (WRR), random early detection
		(RED), weighted random early detection (WRED)
	■ SNMP: T1 MIB and DS0 MIB
	■ Dynamic, arbitrary channel configuration
	■ Full bit error rate test (BERT) patterns at T1 and DS0 levels
	■	Encapsulations:
		■ High-Level Data Link Control (HDLC)
		■ Frame Relay
		■ Circuit cross-connect (CCC)
		■ Translational cross-connect (TCC)
		■ Point-to-Point Protocol (PPP)
Cables and connectors	■	120-ohm RJ-48C connector (female)
LEDs	One tricolor per port:
	■ Off—Not enabled

■ Green—Online with no alarms or failures

■ Amber—Online with alarms for remote failures

■ Red—Active with a local alarm; router has detected a failure

46■ Channelized T1 IQ PIC