Excalibur® T-1 CSU
Channel Service Unit

Technical Specifications

Product Photo

  • One or three T-1 network interfaces
  • Full and fractional T-1 compatibility
  • Requires only one card slot
  • Interconnects to other vendor's T-1 interfaces
  • User-definable DS0 mapping
  • Drop and insert capability
  • Combined data and voice capability
  • D4-to-ESF and AMI-to-B8ZS conversions
  • Non-interruptive monitor jacks
  • CMS management compatibility

The Excalibur® T-1 Channel Service Unit (CSU) is designed to reduce the number of digital or analog lines needed in your network by transmitting data from up to 24 digital or analog circuits over a single (full or fractional) T-1 link. Occupying a single slot in the Excalibur Card Carrier, the unit minimizes space requirements and eliminates the need for external equipment.  Two models are offered: one provides a single network interface, the other provides three.

Operating Flexibility
The T-1 CSU interfaces with the Excalibur Single-Ended T-1 (SET-1) Digital Access Product (DAP) via two independent TDM buses. From the Excalibur Card Carrier control panel or from a CMS® network management system console, DS0 channels can be assigned to a particular T-1 link. This feature allows you to quickly and easily reroute data to bypass a failed T-1 link.

Drop and insert capability at the DS0 level allows you to connect a T-1 PBX or other T-1 device with underutilized bandwidth to the T-1 CSU. This feature eliminates the need for a separate T-1 circuit to support the PBX voice application or other data applications.

AT&T ASDS Compatibility
The T-1 CSU is compatible with AT&T Publication 62411 for both SF (Super Frame) and ESF (Extended Super Frame) formats. The T-1 CSU is DACS compatible, supports all ESF diagnostics per AT&T 54016 and ANSI T1.403, and supports AMI (Alternate Mark Inversion) or B8ZS (Bipolar with Eight Zero Substitution) line codes.

Performance Monitoring
The T-1 CSU continuously monitors each in-service T-1 line for a complete set of logic and format parameters including:

The Excalibur T-1 CSU features three separate sets of 24-hour registers for each T-1 line: user, Telco, and network. Each set of registers monitors line statistics for the current 15-minute interval and for the last 24 hours. ESF diagnostic information is available and can be reset from the control panel or the CMS system console. This feature provides T-1 circuit performance monitoring without interrupting normal operation.

Alarm Reporting
A variety of alarm conditions are reported and displayed on the control panel or the CMS system console. Alarms are also recorded in the T-1 CSU or the CMS system for later inspection, providing efficient problem tracking capabilities. The time interval before a T-1 line alarm is reported is user-selectable and each CSU and T-1 line alarm may be independently enabled or disabled.

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Typical Excalibur T-1 CSU Application


Excalibur T-1 CSU Technical Specifications

Multiplexing Technique Time division
Line Rate 1.544 Mbps
Network Interface Compatibility:   AT&T 62411, 54016, ANSI T1.403, and TR-NLP-000054
Format: Super Frame (SF) or Extended Super Frame (ESF)
Line Coding:  AMI or B8ZS
Interface:   RJ48C (T1)
CMS Interface 10-position modular jack (T7)
Bundling Independently selectable, alternate, or contiguous
Transmit Line Build-Out 0, -7.5, -15, or -22.5 dB
Receiver Sensitivity 0 to -36 dB
Distance 6000 feet maximum with 22-gauge wire
Clock Source Line, internal, station, TDM
Alarms Out-of-Frame (Red alarm), Out-of-Sync (Yellow alarm), AIS (Blue alarm), Loss of Signal (LOS), Excessive Bipolar Violations (BPV), Errored Seconds (ES), Controlled Slip (CSS)
Loopback Tests TDM bus loopback, local channel loopback, local link loopback
Network Diagnostics ESF diagnostics, 24-hour registers and 1-second reports per ANSI T1.403
Approvals FCC Part 15 and Part 68, CDOC, UL approved

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. 3C1275-5/99



Copyright © 1999 - All rights reserved.

Last Modified: October 8, 1999