Owner`s manual

3–4 DEChub 900 MultiSwitch Owner’s Manual
Hub Out-of-Band Management (OBM) Port
The signals on the hub OBM port (DB-9) conform to standard EIA-574. Standard
EIA-574 is based on standard EIA-232D, which uses a 9-pin connector instead of a
25-pin connector. This is the signaling standard used by most personal computers
for their serial ports. The port appears as a data terminal equipment (DTE) device.
The OBM port supports flow control for Request to Send (RTS) and Clear to Send
(CTS) hardware communications. Refer to Appendix B for information about signal
connections.
The OBM port can be connected to a terminal server, personal computer, or a
modem using various cables and adapters. Refer to Table 3–2 for your configura-
tion. Refer to Chapter 4 for additional information about OBM.
Table 3–2: OBM Port Cabling
Cable/Adapter Type
Connecting Device
BN24H–xx
1
/H8571–J
2
DECserver 900TM, DECserver 90TL, or
DECserver 90M with a 8 MJ connector
BC29Q–10
2
PC with 9-pin D-Sub connector
BC29P–10
2
Modem with 25-pin D–Sub connector
1
The xx represents the length in meters.
2
Not included in the kit.