184 CHAPTER 5: PATHBUILDER S330 DIAGNOSTICS AND PERFORMANCE STATISTICS
The following prompt appears:
Enter Channel (1-8):
3 Enter the number of the channel for which you want to set a loopback to open
the VCM Channel Loopback menu for that channel. Figure 144 shows the VCM
T1-DSX Channel Loopback menu. The VCM E1 Channel Loopback menu is the
same.
Figure 144 VCM Channel Loopback Menu
4 Select [1] Set Loopback. A prompt appears, listing the available types of channel
loopback.
5 Enter the appropriate number to select one of the following types of channel
loopbacks (or no loopback):
PCM Loopback——Loops digital receive to transmit toward the T1 port.
PCM Packet Loopback——Loops coder output to coder input toward the T1
port, using the DSP channel PCM packet loopback.
Network Packet Loopback——Loops coder input to coder output toward the
ATM network, using the DSP channel network packet loopback.
6 Select [2] Apply Setting to Channel(s).
The following prompt appears:
Enter Channel (1-8):
7 Enter the number(s) of the channel(s) to which you want to apply the settings to
set the specified loopback for those channels. You can enter a single channel, a
range of channels (for example: 4-6), or a list of channels separated by commas
(for example: 4,5,6).
