Juniper Networks M20 - Manual (Page 14)

Channelized DS3 PIC
■ JUNOS 4.2 and later Software release
■ Four DS3 ports
■ Power requirement: 0.32 A @ 48 V (15.6 W)
■ Supports up to 28 T1 channels per port
■ Data Service Unit (DSU) functionality
Description
■ Each T1 channel supports a single High-level Data Link Control (HDLC) framer that can
be configured for speeds ranging from DS0 (64 Kbps) through full T1 (1.54 Mbps)
■ Predictable throughput on all ports at 1.54 Mbps, full duplex
■ Rate limiting on input and output
■ Packet buffering, Layer 2 parsing
Hardware features
■ DS3 alarm and event counting
■ DS3 alarm and event detection
■ DS3 diagnostics and loopback control
■ B3ZS line encoding
■ M13 or C-bit parity
■ DS3 Simple Network Management Protocol (SNMP) support (DS3 MIB)
■ Per-packet counts and byte counts
■ Local and remote loopback testing
■ Encapsulations:
■ High-Level Data Link Control (HDLC)
■ Frame Relay
■ Circuit cross-connect (CCC)
■ Translational cross-connect (TCC)
■ Point-to-Point Protocol (PPP)
Software features
■ Custom 10-ft (3.05-m) posilock to BNC male cable, separate RX and TX Cables and connectors
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
LEDs
14 ■ Channelized DS3 PIC
M20 Internet Router PIC Guide: End-of-Life PICs