Software release
- JUNOS 4.1 and later
Description
- 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
Hardware features
- 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
Software 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
- Multiprotocol Label Switching (MPLS) circuit cross-connect (CCC)
- Point-to-Point Protocol (PPP)
Cables and connectors Two versions:
- Four RJ-48 connectors (one per port)
- Four coaxial connectors
- Custom 10-ft (3.05-m) posilock to BNC male cable, separate Rx and Tx
LEDs 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
Alarms, errors, and events
- Alarm indication signal (AIS)
- Bipolar violations
- Excessive zeros
- Far-end block errors (FEBE, E-bit errors)
- Loss of frame (LOF), Loss of signal (LOS)
- Local and remote loopback diagnostics
- Yellow alarm bit (X-bit) disagreements
