RuggedCom RuggedRouter RX1100 - Manual (Page 71)

7. Configuring Frame Relay/PPP And T1/E1
Revision 1.14.3 71 RX1000/RX1100™
Note
Once a channel is created, and an interface is constructed on it, the name of the interface will
never change. This will remain true even if the number of timeslots on the channel is changed.
This property is desirable since interface names used by features such as OSPF, RIP and the
firewall can rely on the interface name. Channel re-assignments can, however, lead to a non-
intuitive relationship between channels and timeslots.
7.2.2. Editing A T1/E1 Interface
Figure 7.5. Edit T1 Interface
This menu allows you to display and configure T1 or E1 Trunk parameters. By default the interface
is set for T1 operation. The Convert this interface to E1 link will set the interface for E1 operation
and allow you to configure its settings.
If logical interfaces use a channel number larger than 24, an attempt to convert from E1 to T1 will
prompt to delete the logical interface first.
7.2.2.1. T1 Settings
The Framing field determines the framing format used. Your line provider will indicate the correct
format. Modern facilities usually employ Extended Super Frame (ESF), an enhanced T1 format that
allows a line to be monitored during normal operation.
The Line Decoding field reflects the line encoding/decoding scheme. Almost all T1s now use B8ZS.
The Clocking field selects whether to accept or provide clocks. In normal use the central office
provides clocks and your setting should be "Normal". You may also connect to another router by using
a cross-over cable and selecting a "Master" clocking option on one of the two routers.
The Line Build Out field “tunes” the shape of the T1 pulses and adjusts their amplitude depending
upon distances and the desired attenuation.
7.2.2.2. E1 Settings
The Framing and Line Decoding fields for E1 reflect the European variants.
The Clocking field performs the same function as that described for T1.