Excalibur® Multiport SET-1 DAP
Digital Access Product

Technical Specifications

Product Photo

  • Six-channel point-to-point TDM
  • Multiport/multidrop operation option
  • SNMP or Milgo’s proprietary management protocol
  • TELNET client support
  • CMS® network management compatibility
  • Analog, Switched 56, or ISDN dial backup option
  • Built-in port sharing with multiple shared groups
  • Mixed protocols on a single DDS line or T-1 link

The Excalibur® Multiport Single-Ended T-1 (SET-1) Digital Access Product (DAP) is designed to reduce the number of digital lines needed in your network. Housed in the high-density Excalibur Card Carrier chassis, central site SET-1 DAPs operate with an internal Excalibur T-1 CSU (Channel Service Unit). Data from up to 24 digital circuits can be transmitted over a single (full or fractional) T-1 link to the Telco, saving up to five times the cost of individual 56/64 Kbps circuits. The Telco demultiplexes the data and distributes it to the remote DAPs over digital data service lines. Point-to-point and multiport/multidrop models are offered.

Point-to-Point Multiplexing
Remote units operate on point-to-point Dataphone Digital Service (DDS) or Clear Channel 64 Kbps lines with channel rates of 9.6, 19.2, 56, or 64 Kbps. Each DAP supports up to six ports. The point-to-point multiport SET-1 DAP operates in a constant carrier point-to-point mode with an available aggregate data channel bandwidth of 8.4 to 57.6 Kbps.

Multiport/Multidrop Operation
The multiport/multidrop SET-1 DAP allows you to run up to six different protocols over one multidrop digital circuit with no interaction between the ports or protocols. Milgo supplies a multiport/multidrop DAP that electronically appears as if it were running on six separate multidrop lines. Using this technology, it is possible to run six protocols from six different locations over one multidrop circuit.

When a remote drop is added, the central DAP automatically brings the unit on-line. An Excalibur Multirate DAP may be a participant when only one port is required at a location. Milgo's patented multiport/multidrop technique does not add any delays to the network, nor does it allow response time from one host to affect response time from another host. Remote units operate on multipoint DDS lines.

SNMP or Proprietary Management Protocol
Excalibur Multiport SET-1 DAPs can be fully managed via SNMP (point-to-point only) or via Milgo’s proprietary T7 management protocol. The integral MIB-II compliant SNMP agent provides a standards-based management interface, which allows you to manage your complete network via SNMP from a CMS® manager or a generic SNMP manager. The extended MIB includes all functionality found in T7. The multiport/multidrop feature and the analog dial backup option are not available for SNMP models. Full TELNET client support is included with SNMP.

Network Management Capability
For those networks that require comprehensive management, testing, and control features, the Excalibur Multiport SET-1 DAPs can operate with a CMS network management system. A CMS system provides sophisticated database management, performance analysis, fault isolation, and network restoral capabilities from a central location.

Multiple Groups of Shared Remotes
Designed with built-in port sharing, the units can operate with asynchronous or synchronous terminals on a port-by-port or shared group basis. Up to three groups of shared ports can be configured or all six ports can be configured in one shared group. This feature provides capabilities such as a central unit sending three separate applications to remote units with three sets of shared ports or one application to remote units with six ports in one shared group. This feature can significantly reduce your communication costs by eliminating the need for external modem sharing or port sharing devices.

Dial Backup Option
In the event your digital lines go down, the Excalibur Multiport SET-1 DAP offers dial backup options. Whether you choose analog lines, Switched 56, or ISDN backup, this option can keep your operation up and running. The dial backup connections can be established automatically or manually.

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Typical Multiport SET-1 DAP Application

Excalibur Multiport SET-1 DAP Technical Specifications

T-1 Link Interface Internal Excalibur T-1 CSU
Network Configurations Point-to-point, multipoint
DTE Speeds Synchronous: 1.2 to 52.8 Kbps in multiples of 1200 bps (except 3.6 and 6 Kbps are not provided) and 56, 57.6, 64 Kbps
Asynchronous: 75, 150, 300, 600 bps and 1.2, 2.4, 4.8, 7.2, 9.6, 12, 14.4, 16.8, 19.2, 24, 28.8, 48, and 57.6 Kbps
DDS Channel Rates 9.6, 19.2, 56, and 64 Kbps
Aggregate Channel Bandwidth 8.4, 18.0, 52.8, and 57.6 Kbps
DTE Interface Ultra-miniature EIA-232-E Alternate A connectors, V.35 option on Port 1
CMS Interface 10-position modular jack (T7)
SNMP Interface 10-position modular jack, synchronous or asynchronous PPP interface at rates of 2.4, 4.8, 9.6, and 19.2 Kbps
Bandwidth Allocation Reserved (TDM), shared (port sharing), or mixed
Port Clocking Internal, external, and slave
Dial Backup Options Connections: 2-wire 14.4 or 28.8 Kbps analog, 4-wire Switched 56 Kbps, or 2-wire Integrated Services Digital Network (ISDN).

14.4 Kbps analog dial backup operates in Programmable or Permissive mode, supports V.32 or V.32 bis+ (Milgo proprietary mode with non-interruptive secondary channel) format.

28.8 Kbps analog dial backup operates in Programmable or Permissive mode and provides V.34 modem support.

Switched 56 dial backup operates at 56 Kbps over MCI's Switched 56 Service, AT&T's Accunet Switched 56 Service, or Sprint's Enhanced Switched 56 Service.

ISDN dial backup operates at 56 or 64 Kbps over ISDN Basic Rate service. It complies with all applicable specifications, including National ISDN-1 standard, Northern Telecom Basic Rate Access, and AT&T Basic Rate Access. It can operate with another DAP equipped with Switched 56 dial backup, providing backup to locations where ISDN service is unavailable.

Environmental Operating Temperature: 32° to 122° F (0° to 50° C) 
Storage Temperature: -22° to 158° F  (-30° to 70° C)
Humidity: 85%, noncondensing

Our policy of continuous development may cause the information and specifications contained herein to change without notice.

CMS and Excalibur are registered trademarks of Milgo Solutions. All other logos and product names are trademarks or registered trademarks of their respective companies.

©1999 Milgo Solutions. All rights reserved. Printed in U.S.A. 3C1068-5/99

Copyright © 1999 - All rights reserved.

Last Modified: October 6, 1999