Afar NX-2E1, Operator'S Manual

Page: 43 / 75

NetCrossing Gateway NX-2E1/T1 Operator’s Manual
4-9
In order for two gateways to establish a serial link, the clock source in the two units must be set
in a compatible fashion. This requires that one unit have its clock source set to remote, and the
other to either internal, external or remote.
loopback=disable or input or output
Selects different loopback modes of the TDM port used for test purposes as follows:
disable : default value used for normal operation.
input : The TDM data stream input into the gateway is looped back to come out in the same
port. The data stream received from the remote unit is discarded.
output : The TDM data stream output by the gateway is looped back into the receive data
stream. The TDM data stream coming from the user device is discarded. This is equivalent to
placing a loopback plug in the RJ45 connector.
framing=d4 or esf or unframed
Selects the T1 framing format. In unframed mode the gateways transports every bit (including
frame bit) without regard to frame or multiframe structure. In d4 or esf the gateway aligns its
data collection to the TDM multiframes and collects only the time slots specified with the slots
parameter. The frame bit is not included in the WAN packets. At the opposite end the
receiving gateway generates the multiframe synchronization pattern and fills the slots, specified
with the
slots parameter, with the data received from the remote gateway.
coding=ami or b8zs
Selects the TDM line coding. Set it to the same format of the T1 equipment connected to the
Gateway.
receive-sensitivity=long-haul,short-haul
Selects the TDM port receiver sensitivity for the two applications.
line-build-out=133ft or 266ft or 399ft or 533ft or 655ft or 0dB or 7.5dB or 15dB or 22dB
This parameter controls the shaping of the T1 transmit signal waveform for various cable
lengths. In short-haul applications specify the cable length in feet from 133 (0 to 133) to 655.
For long-haul specify the build out in decibels.
idle-code=0..255
Specifies the byte to use in each time slot when no other value is available. This could be due
to running the link in fractional mode or due to an underrun error.