Unisys manual Configuration Diagrams, NX5820 Channel Assignments and Configurations

Configuring Channels

Configuration Diagrams

Figure 5–6 and Figure 5–7 are examples of typical channel configurations. Actual configurations may vary depending on the number and types of channels configured. Figure 5–8 shows the typical locations of the PCI thru card when used optionally to connect a server via the internal channel rack or remote channel rack. The following rules apply:

•Reserved channels occupy preassigned channel card slots; however, the locations assigned to the channels in these examples are typical. The actual card slots occupied by the MAINTLAN, 802.3, and SCSI–2W cards may vary with the system.

•All configurations are subject to channel loading considerations; that is, channel loading is restricted to sixteen channel loads per CMF.

Table 5-5 list the various channel assignments and configurations.

Table 5–5. NX5820 Channel Assignments and Configurations

Name/Use	Description
CS-4, CS-5	The internal bus from CMFn to the corresponding row of channel card slots in
	the internal rack.
CS-0, CS-1, CS-2, CS-3	The external bus from CMFn to an external channel or server’s PCI bridge
	(Windows NT only)
A0 to A9 or B0 to B9	Module card slot locations.
P1, P2, P3	Module card row number.
R1 to R8	The requestor channel number associated with the corresponding card slot in
	the internal channel rack. If a channel card occupies more than one card slot,
	the requestor channel number assumes the lowest logical number of the card
	slots occupied.
MAINTLAN	Each domain requires a MAINTLAN channel for access to the Maintenance Hub
	for private use. The channel was arbitrarily assigned to card slot A0 (P2 &P3)
	or B0 (P2 &P3) for NX5820.
CA322-SCI	Each domain requires two dual-initiated SCSI-2W channels. One channel
	services the QIC tape and CD-ROM located in the OSS7000 rack. The second
	channel serviced two disks also located in the OSS7000 rack. The channels
	were arbitrarily assigned to card slots A3 (P3) and B2 (P3) or B3 (P3) and A2
	(P3).
CA626-BAS	Each domain requires an 802.3 channel card for access to an 802.3 Ethernet
	Public LAN and is available for client use. The channel was arbitrarily assigned
	to card slots A1 (P2 & P3) or B1 (P2 & P3)
PCI3-FTH	Optional connection of a server via PCI thru bridge card. See Figure 5-8 for
	optional configurations of the PCI thru card. PCI3-FTH is shipped from the
	factory to be used with relative address 3 in channel racks.

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