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Chapter 1: Introduction to the EIU 23
DMS-100 Family EIU User Guide TELECOM12
• Cellular digital packet data (CDPD). The CDPD service transports
datagrams between the mobile and private/public data networks.
• Programmable service node (PSN). PSN is a flexible platform that lets
operating companies rapidly deploy advanced services into their network.
Deployment is achieved through a service control unit (SCU). The SCU is
an external computing platform that controls the call processing on the
switch using a high-speed data link.
• Remote management system (RMS). RMS provides telnet and file
transfer protocol (FTP) functionality to the DMS-250 switch. Telnet is a
protocol for remote terminal access.
• Intelligent Call Manager (ICM). ICM provides the protocol support for
Computer Telephony Integration applications (for example, Symposium
Call Center Server, SSCS) in accessing the DMS via TCP/IP protocols.
System architecture
The data communications environment supports data links that are not tied to
the call processing network functions of the switch. These links do not use the
DMS network or line access capabilities. This characteristic is important when
supporting OAM links. These links must become functional in the early stages
of switch initialization and remain functional through all but catastrophic
failures, including call processing failures.
The EIU is a gateway between the DMS-bus and an Ethernet that supports user
data links. The EIU is a concentration point between remote peripherals
(workstations, terminals, and routers) and the DMS-bus. The remote
peripherals are not terminated on the EIU, but on concentrators. These remote
peripherals allow the network engineers to connect alternate link levels and
asynchronous terminal equipment (MAP terminals, printers, and so on) to the
system. The Ethernet also provides a link between the DMS-100 switch and
the workstations used for processing.
Figure 1 shows an overview of the architecture of the enhanced SuperNode
system.