E1 PIC
■JUNOS 4.1 and laterSoftware release
■Four E1 or coaxial ports
■Power requirement: 0.08 A @ 48 V (3.74 W)
■Two versions:
■4-port, 120-ohm, RJ-48
■4-port, 75-ohm, coaxial
■Onboard DSU functionality for E1 connectivity
Description
■High-performance throughput on each port at speeds up to 2.048 Mbps, full duplex
■Maximum transmission units (MTUs) of up to 4500 bytes
■Per-interface diagnostics and loopback control
■Per-interface shaping on output
■Per-interface alarm and event counting and detection
■HDB3 line coding
■4-bit CRC for G.704 framed mode
■Per-port loop timing
■Balanced and unbalanced modes
■Packet buffering, Layer 2 parsing
■Full bit error rate test (BERT)
Hardware features
■Integrated support for G.703 unframed mode and G.704 framed mode with CRC; this
feature is user-configurable
NOTE: The G.704 implementation supports speeds slower than 2.048 Mbps; multiple channels
within a single E1 interface are not supported.
■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
38 ■E1 PIC
M20 Internet Router PIC Guide