Monitoring the DSU
Network LEDs
OK | ALARM TEST | ||||
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DM ± Data Mode:
ON ± DSU (DDS network interface) is sending or receiving data, or is in DMI condition
(all 1s being received).
OFF ± DDS network interface is receiving CMI codes.
OOS ± Out of Service:
ON ± DSU is receiving out of
service code from the remote unit. Refer to Table
OOF ± Out of Frame:
ON ± DSU is detecting an out of frame condition. Refer to Table
and Status Messages.
NS ± No Signal:
ON ± DDS network interface detects no signal. Refer to Table
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| OOS OOF |
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| TXD | (103) |
| (104) |
| (105) |
| (106) |
| (108) | ||||||||
DM | NS |
| RXD |
| RTS |
| CTS |
| DTR |
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System 
red |
| green |
Network 
yellow
Port
November 1997 |