Splitting up a t1 Line

Posted on 2005-04-21
Last Modified: 2011-10-03
I want to provide internet sccess to several different Lans via 1 t1 line. How can I do this - what hardware will I need.
Question by:jguiciar
    LVL 8

    Expert Comment


    a multiplexor, possibly several routers, and LAN switches .
    thats it, the routers can be substituted with servers multiple LAN adapters.
    LVL 8

    Expert Comment


    the general idea is:

         Multiplexor  (converts the T1 line into a RJ45 connection for use with switches and servers)
           |         |
           |         |
       Switch Switch
       |  |  |     |  |  |
       |  |  |     |  |  |
      Clients  Clients

    you might also want to use a firewall, this would be placed inbetween the multiplexor and the servers.
    LVL 5

    Expert Comment

    Do you care if the LANs are seperated?

    Author Comment

    There are 3 other lans - each separate businesses - most without a server
    LVL 9

    Expert Comment

    I would put in a firewall and a good managed switch behind it.  That way you can create VLANS on the switch and isolate each customer.  
    LVL 79

    Accepted Solution

    You'll need:
    T1 CSU/DSU to terminate the T1
    A router with serial interface (or T1 module built in csu/dsu) to connect to the CSU/DSU
    A firewall to connect between the router and you LAN

    Potential solution:
     T1 --- Cisco 1841 router with CSU/DSU module --- Cisco PIX 515e 6FE (6 x Fast Ethernet interfaces)
                                                                                       |1--- your LAN
                                                                                       |2--- Client 1
                                                                                       |3--- Client 2
                                                                                       |4--- Client 3
                                                                                       |5--- Client 4
    You could replace the 1841, CSU/DSU module, the 515e and a local LAN switch for one Adtran Netvanta 1024/T1 - CSU/DSU/router/firewall/24-port 10/100 switch all in one for a very modest price..

    Else, as rshooper76 noted, you can use VLANs and VLAN capable Layer 3 switches, or VLAN switches with PIX515e to support multiple partner business units..

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