IBM 8237, Инструкция по установке и эксплуатации

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Appendix B. The IBM 8237 Management Information Base
B-9
BYTE 19 : Expansion Port (EP) status2
bit 0-2 : LED status
bit 0 : FEM link status
0 - no link; 1 - link
bit 1 : FEM half/full duplex status
0 - full duplex; 1 - half duplex
bit 2 : FEM port speed
0 - 10 Mbps; 1 - 100 Mbps
bit 3: EP collision led status
0 - off; 1 - on
bit 4-5 :
bit 4 : tx LED status
0 - off; 1 - tx on
bit 5 : rx LED status
0 - off; 1 - rx on
bit 6-7 : reserved
BYTE 20 : SNMP agent & RMON probe status
bit 0 - 1: reserved
00 - SNMP Agent not present (8237-001)
01 - SNMP Agent only (8237-002)
10 - SNMP agent with RMON 1 probe (8237-003)
11 - SNMP agent with RMON 2 probe (8237-003)
bit 2 : master status
0 - subordinate; 1 - master
bit 3 - 4 : reserved
bit 5 - 7 : RMON probe segment
000 - disabled
001 - segment 1
010 - segment 2
100 - segment 3
BYTE 21 : Hub Segment/Bus Termination
bit 0 - 1 : Segment
00 - isolated
01 - segment 1
10 - segment 2
11 - segment 3
bit 2: termination status
0 - not end hub
1 - end hub in the stack
bit 3 - 7 : reserved
BYTE 22 : Hub ID/Hub Position
bit 0 - 3 : hub ID status
0000 - invalid
0001 - 1
0010 - 2
0011 - 3
0100 - 4
0101 - 5
0110 - 6
0111 - 7
1000 - 8
1001 - 9
1011 - 10
1100 to 1111 - reserved