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Configuring a T1 Port
Page 33-5
If you choose the unframed format, then the framer will not look for Channel Associated
Signalling (CAS). Data is treated as a data stream. When used in a circuit emulation applica-
tion, this option must be chosen when configuring an “unstructured” circuit emulation service.
Important Note
You cannot use the unframed format on WAN
modules.
3) Line Build Out
Indicate whether the
T1 port supports short haul or long haul interfaces. Only T1 ports
equipped with Line Interface Unit (LIU) support long haul. Long haul support is necessary if
this T1 port is directly connected to a Central Office (CO) and the cable length is greater than
655 feet (200 meters). If this T1 port connects locally (i.e., it is not connected to an external
CSV) using less than 655 feet (200 meters) of cable, short haul is adequate.
Note
All T1/E1 ports are equipped with a Line Interface Unit
(
LIU) chip.
An additional prompt displays for either the line length between this port and the
T1 device
(short haul configurations) or the attenuation of the cable attaching this port and the T1
device (long haul configurations). Each of these options is described below.
40) Line Length in meters
Displayed only when
short haul is chosen as the Line Build Out option. Specify the distance,
in meters, between this T1 port and the attached T1 device.
41) Attenuation
Displayed only when
long haul is chosen as the Line Build Out option. Specify the attenua-
tion of the line between this T1 port and the attached T1 device.
4) Line Coding
The type of physical encoding used on the connection.
AMI (Alternate Mark Inversion) is
more sensitive. B8ZS (Bipolar 8 Zero Substitution) should be used when possible. In most
networks,
B8ZS is recommended. In all cases, the Line Coding you select must match that
provided by your service provider.