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Fractional T1
With Fractional T1 (FT1), a customer can lease any 64Kbps sub-multiple of a T1
line. FT1 is useful whenever the cost of dedicated T1 would be prohibitive for the
actual bandwidth customer uses.
With FT1 you pay only for what you need. Additionally, FT1 has the following
feature that is unavailable with a full T1 circuit: Multiplexing DS0 channels at the
telephone company’s central office. The remote end of an FT1 circuit is at a Digital
Access Cross-Connect Switch that is maintained by the telephone company.
Systems that share the same digital switch can switch among each other’s DS0
channels. This scheme is popular with ISPs that use a single T1 trunk from their
location to the telephone company’s digital switch. In these cases, multiple clients
can be served with FT1 service.
Typically, you can connect to a T1/E1 CSU/DSU or multiplexer over V.35 or RS 449
serial interface with synchronous protocol at some multiple of 64Kbps. With FT1,
you are pre-allocated a subset of the 24 channels. The T1 multiplexer must be
configured to fill only the time slots that are assigned for your service.
Using an Asynchronous Modem or ISDN Terminal Adapter
This material is covered in the AS/400e Information Center under the TCP/IP
topic. For more information see “TCP/IP Topics in the Information Center” on
page xv.
PPP ISDN Support
This material is covered in the AS/400e Information Center under the TCP/IP
topic. For more information see “TCP/IP Topics in the Information Center” on
page xv.
Configuring SLIP Connection Profiles
This section covers sample property sheets for configuring a Serial Line Interface
Protocol (SLIP) Point-to-Point network connection profile using Operations
Navigator. There is very little difference in how a SLIP connection profile is created
and used from how a PPP connection profile is created and used. This section will
mainly point out any features that are unique to SLIP. Refer to previous PPP
sections for more details on the property pages. You can also refer to the PPP
scenarios in the previous section. These scenarios will also work for SLIP.
Note: This section does not cover how to create SLIP point-to-point connection
profiles (which use *ASYNC lines). For more information on creating SLIP
point-to-point connection profiles, see “Using SLIP with an Asynchronous
Line Description” on page 126.
The General page allows you to define the following general attributes of a
connection profile:
v Name of the profile
v Optional description for the profile
v Which protocol to use (SLIP in this example)
Chapter 4. Configuring Point-to-Point TCP/IP (PPP and SLIP) 115
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