Excalibur™ Dial Restoral System
Network Backup System

Technical Specifications

Product Photo

  • Centralized dial backup of point-to-point and multidrop digital circuits
  • Supports singleport and multiport Excalibur DAPs
  • Can intermix dial backup components, DAPs, and modems in same chassis
  • Analog and Switched 56 dial backup
  • Dial backup circuit pooling for economical restoral
  • Control from CMS 400 or master control panel
  • Dedicated and dial line testing

Increase Network Availability with EDRS
Milgo's Excalibur family of digital access products (DAPs), with their advanced multiport/multidrop capability, let you eliminate many costly dedicated circuits by combining multiple applications onto a single multidrop line. But along with this cost savings comes a concern: with all your applications running on a single dedicated circuit, the effect of a line failure is multiplied. Although DDS service is reliable, you still need a mechanism to protect against catastrophic failures that can occur. That's where the Excalibur Dial Restoral System (EDRS) can help.

EDRS is a centralized, fully integrated dial backup system for the Excalibur DAPs. This system keeps your network up and running when the dedicated circuits fail. When you issue a dial backup command, the system restores your network by automatically routing data to 2-wire analog or 4-wire Switched 56 dial backup lines. EDRS provides dial backup support for singleport and multiport DAPs (standard and SET-1 models) in both point-to-point and multidrop applications.

Common Hardware Platform
EDRS components are housed in the high-density chassis common to all Excalibur Network Access Resource (ENAR) components - the Excalibur Card Carrier. You can mix EDRS components in the same chassis with other ENAR components. One system can consist of up to six interconnected chassis (one full rack). EDRS components can be shared among all DAPs installed in the rack.

Dial Backup Circuit Pooling
EDRS allows you to "pool" dial backup circuits and resources for use in restoring any dedicated circuit in the system - so you don't need a separate dial line and modem for every drop on every circuit. With pooling, you can customize the system for precisely the amount of dial backup coverage you need. And because the pooling takes place within the Excalibur Card Carrier, the need for costly and space consuming matrix switches and/or bridging equipment is eliminated.

Partial or Full Multiport/Multidrop Dial Backup
With EDRS, you can establish dial backup for any number of drops on a multidrop circuit - from one to the total number of drops. In multiport applications, EDRS supports dial backup for any combination of ports, as long as the sum of the port rates does not exceed the dial backup aggregate rate.

Centralized Control from CMS™ 400
The Communications Management Series (CMS) 400 network management system lets you control an entire network of EDRS components from a single PC workstation. You can detect line failure conditions, initiate dial backup, monitor the dedicated line status, and disconnect the dial backup lines.

With the CMS 400, you can establish concurrent dial backup connections for up to four circuits (with up to 16 drops each) per chassis. In a 6-chassis system (one full rack), up to 24 circuits can be in dial backup at the same time.

Local Control from Master Control Panel
You can control EDRS locally using the Excalibur Card Carrier master control panel. The control panel lets you perform dial backup operations for components installed in up to six interconnected chassis. A visual Call Progress feature lets you monitor call progress on the control panel LCD screen.


Excalibur™ Dial Restoral System Technical Specifications

Compatibility Provides dial backup for singleport and multiport Excalibur DAPs and SET-1 DAPs
Components Chassis Controller: Coordinates allocation of Dial Backup Resources
Analog Dial Backup Resource: Establishes 2-wire analog dial backup connections
Switched 56 Dial Backup Resource: Establishes 4-wire Switched 56 dial backup connections
Digital Bridge Board: Vertical rear panel that contains interface connectors
Maximum Concurrent
Dial Backup
Supports concurrent dial backup connections for up to 4 circuits per chassis (64 drops maximum) and up to 24 circuits per rack

Analog Dial Backup Resource

Line Requirements 2-wire PSTN dial-up lines
Line Speeds 4.8, 9.6, 12, and 14.4 Kbps
DTE Speeds
Singleport DAP
Sync/Async - 2.4 (with rate adaption), 4.8, 9.6, 12, and 14.4 Kbps
DTE Speeds
Multiport DAP
Sync: 1.2, 2.4, 4.8, 7.2, 9.6, 12, and 14.4 Kbps
Async: 75, 150, 300, 600 bps and 1.2, 2.4, 4.8, 7.2, 9.6, 12, and 14.4 Kbps
Compliance CCITT V.32, V.32bis, V.32bis+ (Milgo proprietary mode with embedded secondary channel)
Data Format Accepts synchronous or asynchronous data
Dialer Type Pulse, tone, or autosense

Switched 56 Dial Backup Resource

Line Requirements 4-wire Switched 56 dial-up lines
Line Speed 56 Kbps
DTE Speeds
Singleport DAP
Sync: 1.2, 2.4, 4.8, 7.2, 9.6, 12, 14.4, 16.8, 19.2, 38.4, 52.8, and 56 Kbps
Async: 75, 150, 300, 600 bps and 1.2, 2.4, 4.8, 7.2, 9.6, 12, 14.4, 16.8, and 19.2 Kbps
DTE Speeds
Multiport DAP
Sync: 1.2, 2.4, 4.8, 7.2, 9.6, 12, 14.4, 16.8, 19.2, 28.8, 38.4, and 52.8 Kbps
Async: 75, 150, 300, 600 bps and 1.2, 2.4, 4.8, 7.2, 9.6, 12, 14.4, 16.8, and 19.2 Kbps
Data Format Accepts synchronous or asynchronous data
Dialer Type Pulse

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

Excalibur and CMS 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. 3C1069-1/94



Copyright 1999 - All rights reserved.

Last Modified: February 1, 1999