CIBCA VAXBI to CI Dual Path Interface requiring two VAXBI slots.
It consists of a Port Controller module (T1015) and a
Link/Packet Buffer module (T1025).
Priority
arbitration
Contention (light loading)
Round-robin (heavy loading)
Parity Cyclic redundancy checking (CRC)
Data format Manchester encoded serial packet
VAXBI Characteristics
Bus type Synchronous
Width 32 bit
Cycle time 200 ns
Priority Distributed embedded
arbitration
Parity Odd
Data transfers
Block mode (masked)
Longword
Quadword
Octaword
Master port 11.4 Mbytes/sec
bandwidth
Slave port 13.3 Mbytes/sec
bandwidth
Maximum 5 ft/1.5m
transmission
length
Maximum bus 16 logical nodes
loading
CI Characteristics
Bus type Serial
Maximum external 147.64 ft/45m radius from star coupler
length
Maximum data 70 Mbits/sec
transfer rate
Maximum bus 16 logical nodes
loading
Cable type Double shielded coaxial
(BNCIA-XX)
Cable impedance 50 ohms
The CIBCA is a dual port, 2 board, parallel to serial, buffered cluster
interconnect(CI) adapter. The CIBCA consists of a port controller
module(T1015) and a Link/Packet buffer module (T1025). It uses queue
structures under OpenVMS VAX to transfer packet messages and blocks of data
between VAX host memory and and/or other nodes in the VAXcluster.
Features
========
VAXBI Backplane Interconnect design
Diagnostic loopback capability (both internal and external)
Data integrity through cyclic redundancy checking (CRC)
Round -robin arbitration at heavy loading
Contention arbitration at light loading
Packet-oriented data transmission
Immediate acknowledgment of packet reception
Operational Modes
Uninitialized
Disabled
Enabled
Dual signal paths
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