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T1/E1 UNI Port Virtual Circuit Parameters
Receive VPI/VCI — The VPI/VCI of cells received by the T1/E1 port.
Transmit VPI/VCI — The transmit VPI/VCI of cells transmitted by the T1/E1 port.
OC3/STM-1 Port Virtual Circuit Parameters
Receive VPI — The VPI of cells received by the OC3/STM-1 port.
Transmit VPI/VCI — The transmit VPI/VCI of cells transmitted by the OC3/STM-1
port.
Serial Port Virtual Circuit Parameters
You build connections from the local Ethernet port to a remote Ethernet port by
adding permanent virtual circuits (PVCs). These connections allow the packets to
be transmitted through the ATM network to the destination port.
The parameters that appear on the Add Virtual Circuit screen vary, depending on
the configuration of the serial port that is being connected: Frame Relay, DXI, or
SDLC.
The configuration of the card you select on the List Card menu sets the attribute
selection for the virtual circuit configuration parameters. If you configure a virtual
circuit and then change serial port attributes—from DXI to Frame Relay or vice
versa—the circuit will be deleted.
Frame Relay Virtual Circuit Parameters If the serial port is configured as a
Frame Relay port, you must set the following virtual circuit parameters in addition
to the common Shaper Number, Priority, and Early Packet Discard parameters:
Interworking Mode — The Frame Relay/ATM interworking mode: Network or
Service.
Start/End Frame Relay DLCI — The starting and ending Frame Relay data link
connection identifiers: 16...991. These DLCIs are used to identify a Frame Relay
local connection. This parameter applies only if the Interworking Mode is set to
Network.
Encapsulation Mode — The encapsulation data goes around the data packet
and is used to identify the packet; enter
Transparent — This mode is used for point-to-point frame relay
interconnection. See Figure 138. Frame Relay Forum 8 (FRF.8) Service
Interworking for this is being implemented. There are two modes at which
FRF.8 specifies a mode which is transparent and is in fact 1490 over ATM.
Translation — This mode is used in cases when you have ATM devices that do
not support 1490 as a protocol across their ATM trunks; for example, when
you have a PathBuilder S330/S310 switch terminating the ATM network at one
end and an ATM-ready device, such as a router with an OC-3 UNI, at the other
end. Typically these ATM-ready devices do not support 1490 as a protocol
across their ATM trunks, so you have to do LLC_SNAP (1483) per FRF.8. Mode
1F does 1490 to 1483 translation. See Figure 139.
Configuring Virtual Circuits
(Transparent) or
(Translation).
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