- Enterasys Security Router User's Guide

Features
4-2 Configuring T1/E1 & T3/E3 Interfaces
• Support for local and remote loopback
• Support for an IP interface as a loopback (refer to the CLI Reference Guide for an example)
• Timing - line and internal
• Framing - T1: SF, ESF; E1: CRC4, NO-CRC4
• Line encoding - T1: AMI, B8ZS; E1: AMI, HDB3
• Data inversion
• Loopback Tests - local, network line, network payload, inband FDL
• Alarm detection - all levels of alarm/event detection and signaling
• T1 Drop and Insert (D&I NIM) with One to One voice DS0 bypassing
The following features are offered on the T3/E3 interfaces:
T3 Mode
The following features are offered on T3 interfaces:
• Framing - M13 and C-bit parity
• Line build out - short (0 to 250 feet) and long (250 to 450 feet)
• Line interface - 75-ohm BNC coax female connectors
•Clock - line (slaved to network receive clock) and internal (private clock source)
• Line rate - 44.736 Mbps (gross rate including overhead and payload)
• Full Rate - 44.2 Mbps (payload rate only)
• Sub-rate - approximately 3 Mbps increments up to 44.2 Mbps
• Sub-rate compatible DSUs supported:
– Quick Eagle (formerly Digital Link) DL3100 T3 or Cisco-300-44210 Kbps
– Larscom Access T45-3100-44210 Kbps
– ADC Kentrox T3/E3 IDSU-1500-35000, 44210 Kbps
– Adtran T3SU 300-75-44210Kbps
– Verilink HDM 2182-1500-44210 Kbps
• Scrambling - same as for sub-rates, DSU vendor dependant
• Diagnostics - ANSI T1.107 compatible loop backs (initialized from the network)
• Performance monitoring local network port statistics - Current 15 -minute, 24-hour (96 *15-
minute intervals) and total for 24 hours
E3 Mode
The following features are offered on E3 interfaces:
• Framing - G751 or bypass
• Line interface - 75-ohm BNC coax female connectors
• Clock - line (slaved to network receive clock) and internal (private clock source)