Alcatel Omni Switch/Router User Manual page 997

2) Frame Format
Specify the E1 frame format to be used on this port. The choices are as follows:
Standard E1 frame format using the framing bits in time slot 0 for framing.
E1 frame using framing bits in both time slot 0 and
ing.
E1 frame using framing bits in both time slot 0 and time slot 16 multiframe for
framing.
E1 frame using framing bits in time slot 0, time slot 16 multiframe, and
multiframe for framing.
The framing software will not look for framing bits to determine the start of a
frame or multiframe. Data is treated as a data stream. When used in a circuit
emulation application, this option should be chosen when configuring an
"unstructured" circuit emulation service.
You cannot use the unframed format on WAN
modules.
3) Not FAS
Indicates whether you want to add an extra level of frame checking. E1 frames in time slot 0
are composed of alternating bits of
(Frame not containing Frame Alignment Signal). The
framing on and
FAS NFAS
frame alignment signal pattern. If you enable
also check bits, which include remote alarm indication information.
NFAS
4) Line Build Out
The port supports short haul or long haul interfaces. Only
E1
Interface Unit ( ) chip support long haul. Long haul support is necessary if this E1 port is
LIU
directly connected to a Central Office (i.e., not connected via an external CSU) and the cable
length is greater than 655 feet (200 meters). If this E1 port connects locally using less than 665
feet (200 meters) of cable, then short haul is adequate.
All T1/E1 ports are equipped with a Line Interface Unit
( ) chip.
LIU
An additional prompt displays requesting the resistance type used for this port connection.
40) Cable Type
Indicate the cable resistance type used on the short or long haul interface. The cable resis-
tance type can be 75 ohm or 120 ohm. The resistance is a set via a jumper on the E1
board; it is not configurable through software.
5) Line Coding
The type of physical encoding used on the connection.
more sensitive. (High Density Bipolar 3) should be used when possible.
HDB3
Important Note
(Frame containing Frame Alignment Signal) and
FAS
bits. Normally, the framer checks only
Note
multiframe for fram-
CRC-4
option tells the framer to check
bits, which contain the
FAS
, then framing software will additionally
ports equipped with a Line
E1
(Alternate Mark Inversion) is
AMI
Configuring an E1 Port
CRC-4
NFAS
Page 33-9