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CHAPTER 1: Introduction
1. Introduction
1.1 Overview
The CSU/DSU MS DBU (data service unit with embedded SNMP) provides
a reliable, high-speed data connection for customer data terminal equipment
through digital data service (DDS) lines. The CSU/DSU MS DBU has an
embedded SNMP agent that provides complete SNMP access to the unit through
an integral SLIP or PPP async port. The CSU/DSU MS DBU’s unique modular
approach provides optional 10BASE-T Ethernet access for SNMP. Also, optional
modular DBU cards provide automatic or manual dial backup for the dedicated
circuit.
The following are features of the CSU/DSU MS DBU:
• DDS rates supported from 2.4 to 64 kbps, including 19.2 and 38.4
• 4-wire Switched 56 (SW56) operation
• Embedded SNMP and TELNET
• Control port provides SLIP and async PPP access to SNMP or VT100 terminal
configuration
• Two option slots
• 10BASE-T Ethernet SNMP port available with the SNMP Ethernet Module
• Automatic or manual DBU
• DBU available with DBU cards; options include 4-wire Switched 56, V.34,
and ISDN
• Time-of-day and weekend lockout options
The CSU/DSU MS DBU provides both V.35 and EIA-232 electrical and physical
DTE interfaces to accommodate a variety of applications.
To ensure a reliable connection, the unit features an extended receiver capability
which permits operation over long loops (3.4 miles or 5.5 km of 26 AWG at
56 kbps).
The 4-wire Switched 56 Module and the base unit’s integrated SW56 capabilities
are compatible with AT&T Accunet
®
and Sprint
®
SW56 type services. The V.34