Specifications

SmartSwitch ATM Switch Reference Manual 2-65
Console Commands DS3E3LoopBack
Examples
switch_prompt # show ds3e3loopback
Port(ALL) :
Port Type Loopback
==============================================================================
1D1 DS3 None
1D2 DS3 None
1D3 DS3 None
1D4 DS3 None
switch_prompt #
switch_1 # set ds3e3loopback
Port() : 1d3
Loopback(None) : Cell
NOTICE - 'tConsole' Port 1D3 (15) DOWN
switch_1 # show ds3e3loopback
Port(ALL) :
Port Type Loopback
==============================================================================
1D1 DS3 None
1D2 DS3 None
1D3 DS3 Cell
1D4 DS3 None
Table 2-3 DS3 and E3 Loopback Modes
Mode Description
None Loopback is not enabled. The port passes normal traffic.
Cell The DS3 or E3 stream is received from the network, unframed into ATM cells, reframed, and then
retransmitted to the network.
Payload The DS3 or E3 stream is received from the network, has the DS3 or E3 overhead bits reinserted, and is
retransmitted to the network.
Line Connects the transmitter to the receiver. The DS3 or E3 stream received from the line is retransmitted
back out to the line. Cells generated by the switch to this port are not sent over the line.
Diag Connects the receiver to the transmitter. The DS3 or E3 stream transmitted by the switch to a port is
looped back to the switch. The DS3 or E3 stream is still transmitted to the network, but the incoming
DS3 or E3 stream is ignored.