Juniper Networks M20 manual T1 PIC

M20 Internet Router PIC Guide

T1 PIC

Software release ■ JUNOS 4.1 and later

Description	■	Four T1 ports
	■ Power requirement: 0.08 A @ 48 V (3.7 W)
	■ Supports clear channel T1 per port (1.544 Mbps per channel)
	■ Supports attenuation up to –12 dBm
Hardware features	■	Per-port loop timing
	■ Onboard DSU functionality for T1 connectivity
Software features	■	ESF and SF framing
	■ B8ZS and AMI coding
	■ ESF CSU counters, WRT impairments, and CRC checking
	■ Local DS1 line loopback, remote line loopback
	■ Configurable clock source—internal or loop
	■	Encapsulations:
		■ High-Level Data Link Control (HDLC)
		■ Frame Relay
		■ Circuit cross-connect (CCC)
		■ Point-to-Point Protocol (PPP)

Cables and connectors

LEDs

Alarms, errors, and events

■100-ohm RJ-48 connector

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

■Alarm indication signal (AIS)

■Bipolar violations

■Excessive zeros

■Far-end block errors (FEBE, E-bit errors)

■Loss of frame (LOF), Loss of signal (LOS)

■Yellow alarm bit (X-bit) disagreements

66■ T1 PIC