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spar.txt
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1993-12-17
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** $Filename: spar.txt $
** $Revision: 37.2 $
** $Date: 93/12/17 22:04:31 $
The spar.device is a Sana-II PARnet device driver. It acts globally
as any regular Ethernet driver, but has some limitations.
The WireType for Spar is defined as Ethernet:
#define S2WireType_Ethernet 1
ios2_DataLength:
Valid lengths for PARnet packets are the same as those defined for
ethernet. From 64 up to 1500 bytes of data.
Address format:
The format for PARnet are made ethernet-alike, but it does not
support any broadcast/multicast addresses. Broadcast is only
accepted on ARP packets and when using the point-to-point mode.
The standard for expressing ethernet addresses is as 6 bytes
(octets) in the order in which the bytes are transmitted with the
low-order bits in a byte transmitted first. Internally PARnet uses
only one byte for addressing, this byte is taken from the first
(0th) byte of the ethernet address.
Ethernet addresses in a Sana2IOReq occupy the first 6 bytes of
an address field in transmission order with the low-order bits in
a byte transmitted first.
Station Address:
Each PARnet unit must have a unique hardware address. Since it has
no built-in (ROM) address, it must be assigned using the
ENV:Sana2/sparX.config file, where X representing the spar.device
unit number.
Raw reads and writes:
1 bytes of destination address,
1 bytes of source address,
2 bytes of type,
64 to 1500 bytes of data
(Internally converted to PARnet packets, which can not be seen by
the user)
Multicast: Not supported
Broadcast: Only supported when sending ARP packets, or when using the
point-to-point mode by filling in the DSTADDR field in the
ENV:Sana2/sparX.config file.
Promiscuous: Not Supported
Packet Type Numbers:
These are the same as those for Ethernet. Ethernet packet type
numbers are assigned by:
Xerox Corporation
Xerox Systems Institute
475 Oakmead Parkway, Sunnyvale, CA 94086
Attn: Ms. Fonda Pallone
(408) 737-4652
Some Common Packet Type Numbers:
decimal Hex Description
------- --- -----------
000 0000-05DC IEEE 802.3 Length Field
2048 0800 TCP/IP -- IP
2054 0806 TCP/IP -- ARP
32821 8035 TCP/IP -- RARP
32923 809B Appletalk
33011 80F3 AppleTalk AARP (Kinetics)
33100 814C SNMP
33079 8137-8138 Novell, Inc.