*CI780* XMI to CI Dual Path Interface consisting of LINK (ILI,
L0100), PACKET BUFFER (IPB, L0101) and DATA PATHS (IDP,
L0102), and the SBI Interface (ISI, L0104) modules, Pressed
pin backplane (70-17654), H7100 power supply with H7101 -5V
regulator (70-14956) and 2 each TX/RX cable sets (70-18527).
*Data Format* Manchester encoded serial packets
*XMI Bandwidth 70 Mbytes/s (for HW transfers)
and transfer
rate*
*CI data 5 MB/sec (maximum)
transfer rate*
*Data 3 MB/sec (maximum)
throughput*
*Modes*
Uninitialized
Uninitialized/Maintenance
Disabled
Disabled/Maintenance
Enabled
Enabled/Maintenance
*SBI priority TR4/BR4
level*
*Supported VAX 11/780, VAX 11/782
host systems*
*Supported CI HSC50 controller
storage
controllers*
*Supported SC008
Star Couplers*
*Minimum OpenVMS Version V3.1
Operating
System*
The CI780 is a high speed, serial data bus used to link two or more computer
subsystems(nodes) to form a CI cluster. Data is tranferred via dual path CI
serial data busses and associated SC008 Star Couplers, over TX/RX cable sets
(2ea) with attached bulkhead connectors(PN: 70-18527). The CI780 consists of
four modules; LINK (ILI, L0100), PACKET BUFFER (IPB, L0101) and DATA PATHS
(IDP, L0102), and the SBI Interface (ISI, L0104) modules, pressed pin
backplane (70-17654), H7100 power supply with H7101 -5V regulator (70-14956)
and 2 each TX/RX cable sets (70-18527). . Each Node within a CI cluster
connects to the CI via an interface that provides two separate signal paths.
Dual paths provide a high degree of data availability between nodes. One
pair of nodes can communicate over one path (path A), while the another pair
of nodes communicates over the second path (path B).
Features
========
Dual signal paths capable of simultanious operation
70 megabit-per second bandwidth and transfer rate
Low error rates
Packet-oriented data transmission
Immediate acknowledgement of packet recept
Contention arbitration at light loading conditions
Round -robin arbitration at heavy loading conditions
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