User manual
DynamixUM‐SNBUserManualVer1.00101
HDB3
In this line coding, the transmitter substitutes a deliberate bipolar violation when excessive
zeros in the data stream are detected. The receiver recognizes these special violations
and decodes them as zeros. This method enables the network to minimize pulse density
requirements. Unless AMI is required for your application, HDB3 should be used
whenever possible.
AMI
Alternate Mark Inversion defines a pulse as a “mark,” a binary one, as opposed to a zero.
In an E1 network connection, signals are transmitted as a sequence of one and zero. One
is sent as pulse, and zero is sent as spaces, i.e. no pulse. Every other pulse is inverted
from the previous pulse in polarity, so that the signal can be effectively transmitted. This
means, however, that a long sequence of zeros in data stream will cause problems, since
the NTU receiving the signal relies on the signal to recover the 2048kbps clock.
Setup E1 Parameter, AIS
AIS (Alarm Indication Signal) is a method to inform the remote connection that there is a signal or sync problem with the E1.
AIS is only valid in framed mode E1, not in Unframed E1. The setting here of AIS enabled (on) or not (off) and is for testing with
AIS. When enabled, the E1 will transmit the AIS and it should be confirmed at the remote device (AIS indication lit). After testing,
please turn AIS back off.
z
Example 1: When STU-R E1 RX line is dropped, STU-R sends the status to STU-C via EOC or command, and then