Sais Set To Dis - ADC HiGain HRU-402 User Manual

150-402-100-03
When the HRU is in its AIS/ENA SmartJack Loopback state, its T1 input
LOS, Code and Frame monitoring circuits are connected to the unframed all
ones pattern which is being looped back to these circuits through the T1
Interface chip. The CPE input signal is no longer being monitored since its
input circuit has been opened and terminated into 100 Ω . This forces the FRM
LED off, the Local (LOC) Loss of Signal (LOS) LED off and the Code LED
to indicate AMI if the HLU Code option is set to either AUTO or AMI. The
HRU-402 List 1 and List 3 LED indicate B8ZS if the Code option is set to
B8ZS.

SAIS Set to DIS

This SMJK Loopback state is initiated in the same manner as when the ENA
option is chosen. However, once initiated, the AIS is not sent to the CPE. For
the HRU-402 List 1, the network signal is sent both towards the NI and
through the relay back towards the network. For the HRU-402 List 3, the
network signal is sent towards the NI. As before, the customer's T1 transmit
input port is opened and terminated into 100 Ω .
When the HRU is in its AIS/DIS SmartJack Loopback state, its T1 input LOS,
Code and Frame monitoring circuits are connected to the network signal
which is being looped back to these circuits through the T1 Interface chip.
The CPE input signal is no longer being monitored since its input circuit has
been opened and terminated into 100 Ω . The FRM and LOC LOS LEDs
indicate the status of this signal from the network. The Code LED also
indicates the code (AMI or B8ZS) of this signal if the Code option is set to
AUTO. It indicates AMI or B8ZS if the Code option is set to either AMI or
B8ZS respectively.
The SMJK and NREM loopbacks are identical. They differ only in how they
are initiated. The SMJK identifying label indicates that the loopback was
initiated by the 3-in-5 in band or by the ESF-DL command. NREM is used to
indicate that the loopback was initiated by other than the 3-in-5 or ESF-DL
command (3-in-7, 16-bit, addressable, repeater commands or front panel
push-button).
HRU-402 List 1 and List 3 November 5, 1998
Product Overview
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