Juniper Networks M7I - Manual (Page 100)

T1 PIC (M7i Router)
• Junos OS Release 6.0 and later Software release
• 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
Description
• Per-port loop timing
• Onboard DSU functionality for T1 connectivity
Hardware 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)
Software features
• 100-ohm RJ-48 connector Cables and connectors
One tricolor per port:
• Off—Not enabled
• Green—Online with no alarms or failures
• Yellow—Online with alarms for remote failures
• Red—Active with a local alarm; router has detected a failure
LEDs
• 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
Alarms, errors, and
events
Copyright © 2010, Juniper Networks, Inc. 100
M7i Multiservice Edge Router PIC Guide