Compatible Systems 5.4 - Manual (Page 228)

222 Chapter 14 - General
• If Master is selected, the interface will source clock onto the line.
• If Slave is selected, the interface will sync to the clock received on the
line. The default setting is Slave.
v Note: Units connected to telco lines should always be set for slave mode.
Units driving a dry line should have one end set to master and the other set
to slave.
> Framing
This parameter determines the type of T1 framing to be used on the interface.
Both ends of a WAN connection must be configured with the same framing
format
• If ESF is selected, the interface will expect extended superframe framing
on the line. ESF is the preferred format because it offers a Facility Data
Link which can provide performance monitoring, error checking and
other features. ESF is the default.
• If D4 is selected, the interface will expect the older D4 superframe
framing. D4 may be the only framing format available in some areas.
> Line Encoding
This parameter determines the type of T1 encoding to be used on the
interface.
• If B8ZS is selected, the interface will expect this type of encoding on the
line. With B8ZS, the Channel Data Rate should be set to 64 Kbps. This
is the default setting.
• If AMI is selected, the interface will expect this type of encoding. With
AMI, the Channel Data Rate should be set to 56 Kbps if the line is Full
T1 or if Contiguous channels are being used on a Fractional T1 line. If
Alternate channels are being used on a Fractional T1 line, then the
Channel Data Rate can be set to 64 Kbps.
Fractional T1 Enabled
This checkbox enables fractional T1 operation, where the device’s built-in
CSU/DSU will not use all of the T1 channels in the T1 data stream.
Start Channel & Number of Channels
This pair of edit boxes determines which T1 channel the internal CSU/DSU
will use as the beginning of its T1 fraction, and how many channels it will
occupy.