Tellabs Logo

Class-5 Switch Replacement

Tellabs 1000 MSAP was specifically created to cost-effectively support 100 percent of the Class-5 services over TDM or IP/Ethernet transport networks making it an ideal solution for network transformation initiatives.

Solving the challenges of Class-5 Switch collapse and replacement

Class 5 switch collapse and replacement

As service providers transition their networks to an all-IP Ethernet-centric infrastructure, they are struggling with the challenges of Class-5 switch migration. Class-5 switches have reliably delivered POTS, Special Services and Business Services for many decades, but now the operation of these legacy network elements presents tough challenges:

  1. Lack of Support
  2. Lack of Expertise
  3. Greater Liability
  4. Increased Operational Expense

The Tellabs 1000 MSAP (aka T1000, DMAX, AFC, UMC) was specifically created to cost-effectively distribute 100 percent of the Class 5 services over TDM or IP/Ethernet transport networks. This capability will allow rehoming of services to a reduced number of Class-5 switches so that most can be removed from the network. The Tellabs 1000 MSAP also delivers IP DSL and Ethernet services, allowing for continuing network and service evolution long after the last Class-5 switch is finally retired. With the Tellabs 1000 MSAP, service providers can begin rehoming and removing Universal TR-57, TR-008 and GR-303 Class-5 switches today without giving up the services and revenue associated with them.

Quick Facts

  • Eliminate liabilities by removing old MD’d equipment
  • Cost-effective supports 100% of the Class-5 services over TDM or IP/Ethernet
  • All services on one system for POTS, DSL, Specials, Hi-Caps and DS-3
  • High-capacity T1, OC-3c, OC-12c or GigE for interterminal transport.
  • Low-cost ports that provide required services, including special services
  • Easy upgrade to IP/Ethernet with new cards and software

Featured Class-5 Switch Replacement Content

Highlighted Products for Class-5 Switch Replacement

T1X Transceiver (T1X-XCVR)
T1X Transceiver (T1X-XCVR)
Remote Subscriber Terminal POTS (R-POTS)
Remote Subscriber Terminal POTS (R-POTS)
OC3c Transceiver (OC3c-XCVR)
OC3c Transceiver (OC3c-XCVR)
OC12c Transceiver (OC12c-XCVR)
OC12c Transceiver (OC12c-XCVR)

Helping service providers converge, collapse and connect their access networks.

Tellabs 1000 MSAP solutions

Tellabs 1000 can be used to converge, collapse and connect many different legacy analog switches, including:

  • TR-057
  • Universal
  • TR-008
  • GR-303

Service providers also can deploy the Tellabs 1000 as a line aggregation gateway (LAG), placing the LET and RST function in the same bay. In that case the LAG function can be located in the collapsing CO and will be transported to the host CO via ADMs and IDLC interfaces (either TR-008 or GR-303). The Tellabs 1000 also supports the collapse of a remote switch into a Class-5 switch, with the Tellabs 1000 taking over the function of the collapsed switch. The NNX code, which is derived from the host office, remains unchanged. All emergency stand-alone features remain within the host switch.

Tellabs 1000 MSAP deployment options

Tellabs 1000 MSAP can be used for Class-5 switch replacement. Customers in the collapsing CO receive their dial tone and services from that Class-5 switch; the interoffice facilities (IOF) trunks between the COs route their calls to other end offices. The local Class-5 switch handles call processing within this CO serving area.

Tellabs 1000 can be used collapsing a Class-5 switch into another Class-5 switch. The new receiving switch now processes all calls, and local copper pairs and cables as well as additional DLCs are consolidated in the Tellabs 1000 LAG bays. If the existing local DLCs are Tellabs 1000s, the service provider can consolidate existing Tellabs 1000 LET bays into the Tellabs 1000 LAG bays to reuse the “now spare” equipment at other locations. If the existing local DLCs are not Tellabs 1000s, the service provider can reterminate those central office terminals into the Tellabs 1000 LAG bays. The Tellabs 1000 LAG now handles call processing within the CO serving area.

Tellabs 1000 can also be used when collapsing a Class-5 switch into a softswitch. This collapse scenario requires the addition of a softswitch with a SIP Mediation gateway. The softswitch functions as an IP gateway, converting the TDM-based GR303 DS1 links from the Tellabs 1000 and transporting them to the softswitch.

Looking for more information?

If you still need additional details, and even greater technical explanation, then click on the “Download Overview” button below to access our comprehensive broadband solution overview.

Print a Summary
Print Summary
Download an Overview
Contact a Specialist
Contact Tellabs

News Releases

Corporate news releases recognizing significant achievements of Tellabs operations, products, solutions and customers.

Case Studies

Hear directly from our customers about their successful installations, quantifiable benefits and sincere testimonials.


Up-coming conferences, seminars and webinars where Tellabs products, solutions and people will be actively participating.

Blogs & Articles

Read these short, and regularly updated, opinion pieces covering contemporary industry and technology topics.

White Papers

Download our non-vendor specific overviews meant to help readers understand an issue, solve a problem, or make a decision.


Media to educate and advocate our products, technologies or services, and offer direct insight into our customer references and user case studies.


Tellabs Optical LAN is a true enterprise centric solution that offers a better means of designing and operating networks inside buildings and across extended campuses.


Tellabs 1000 MSAP (aka T1000, DMAX, AFC, UMC) is the industry’s only Broadband Digital Loop Carrier platform that converges legacy copper and modern fiber connectivity.

Technical Assistance Center

Address your questions and challenges quickly with our award winning TAC. Flexible support options to meet your needs.

Professional Services

From small projects to migrations to full turn key services, Tellabs is here to help.


Preparation is the key to success.  Get your team ready to plan, deploy and manage your Tellabs Network. Check our our Training Curriculum today!


You worked hard in Training, now it’s time to show your new credentials off to the World through our Digital Credentialing Program!

Become a Partner

The Tellabs Advantage Partner Program is designed to offer our partners exceptional opportunities to grow your business, increase revenue and gain unique solution differentiation.

Find a Partner

For our end-customers, our Tellabs Advantage Partner Program offer best-in-breed services that match specific vertical markets and geographical regions with the end-customers exact needs in mind.


Meet the Tellabs leadership team that represents diverse areas of expertise, and who are committed to exceeding the expectations of our employees, partners and customers.

Our Team

The Tellabs’ team is passionate in their pursuit of excellence in the office, their community and the greater industry.


Visit Tellabs’ online careers pages to see if there is a job opportunity that matches your ambitions. We offer excellent pay, benefits and career advancement possibilities.


Tellabs offer several easy options for contacting us. You can connect with us today via phone, email, online forms, or through social media channels.