Visara FEP-4600 Installation - Manual (Page 76)

Chapter 6. Ethernet Interface
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Drop ID - The Drop ID is the name that is being given to this drop, and is the same name
that will be added to the list of drops when this definition is saved. The name can be most
any text string (alphanumeric characters plus underscore, dash, and period characters),
and should be created by the administrator to provide a name for the drop that is most
useful to describe what or where it is.
Remote MAC Address - This is the LAN address of the platform that the FEP-4600 is
talking to on this drop. This address might also be referred to as the hardware address, or
LLC address.
Local SAP: This option defines the local Service Access Point address that is assigned
by the FEP-4600 for use for communications with the remote platform. Refer to the ‘SAP
Assignments’ section below for selecting a valid SAP value.
Remote SAP - This option defines the remote Service Access Point address that is
configured on the remote platform that the FEP-4600 is communicating with. Refer to the
‘SAP Assignments’ section in the Token Ring chapter for a discussion on selecting valid
SAP values.
Max Transmit Frame Size - This value represents the maximum size frame (including
TH, RH, and RU) that may be sent in a single packet over the LLC link. Ethernet LLC
circuits are limited to a maximum frame size of 1490. Using a smaller value than what is
supported by the session partner will work, but will result in the transmission of more
packets than if a larger value is set. The minimum size for a PU type 2 is 265. The default
value for this option is 521.
Receive Window Size - This is the maximum number of packets in an LLC conversation
with a session partner that can be received, before an LLC acknowledgement must be
sent. The default value for this option is 1. Refer to the ‘Window Size Selection’ section
in the Token Ring chapter.
Transmit Window Size - This is the maximum number of packets that will be sent
before requiring an LLC acknowledgement. The default value for this option is 2. Refer
to the ‘Window Size Selection’ section in the Token Ring chapter.
Network Protocol – You must select which protocol the FEP-4600 is to use when
communicating with the remote station over this circuit. The options are:
• SNA-PU2 – Use this when the remote platform is a PU 2 control unit or PC
emulating a PU type 2, and the host definition is part of a Local Major Node.
• SNA-PU4 – Use this selection when the remote platform is a 37x5 Front End or
another FEP-4600.
• XCA – Use this value when the remote platform is a PU 2 platform and the host
definition is part of a Switched Major Node definition.