Verilink XEL XSP-100 SHARK IAP (9SA-USRS-9.0R1.02) Product Manual - Manual (Page 18)

Chapter 1: Introduction
Chapter 1-8 XEL P/N & Release: 9SA-USRS-9.0R1.02 SHARK™ IAD User's Guide
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Functional
Description Functional block diagram Figure 2 shows how all these capabilities are
combined into one integrated platform. This modular unit flexibly provides
multiple services to the end user while providing the carrier multiple options for
interconnection and transport back into the CO.
The T1 Interfaces The functional block diagram shows two T1 interfaces for the unit. One T1 is
used as the primary network interface providing service to the unit from the CO.
This interface is designed to support T1 interface options of DSX or CSU
interfaces.
The second T1 interface may be used to support multiple functions as well as
multiple T1 interface options.
This T1 may be used for:
• Network access to the CO (thus providing two full T1’s of bandwidth back
into the network).Add-drop multiplexing of DS0s from the primary T1
interface to serve additional remote services or units.
The Digital Cross
Connect In the center of the block diagram is the Digital Cross-Connect function. This
function performs add-drop multiplexing of DS0s between the primary and the
secondary T1 interface and mapping of various local-side channels (such as
voice and data) into the primary and secondary T1 DS0s. It is also responsible
for establishing internal reference timing.
This cross-connect switch DS0s
between multiple interfaces.
The Network
Management
The Network Management function is responsible for providing status
monitoring, fault detection, alarm management, provisioning and configuration,
and performance monitoring.
Access to the network management function is provided via several avenues:
• An RS-232-compatible port on the front panel for local management using a
standard VT100 type terminal or remotely through an external dial up
modem.
• IP connectivity via the IP Router or WAN modules to the Network
Operations Center (NOC).
The IP Router block provides IP routing among CO data paths and one data
interface.
In addition to basic IP routing, the IP Router provides Network Address
Translation (NAT), proxy DNS and DHCP services to LANs. As an IP router it
will route any protocol tunneled within IP packets (though this may necessitate
disabling Network Address Translation). Also basic FRAD functionality is
included in the router. IP packets from the LAN interfaces are
assembled/disassembled into frames, sent to the WAN port and eventually a
carrier's Frame Relay Network.