COMSPHERE 3550 Series Data Service Units
C-4 December 1996 3550-A2-GB20-20
Table C-3(2 of 3)Device Health and Status Messages
Message Condition
Dial Tone:Fail Dial tone test was enabled and test failed.
DDS F:

alarm

Digital facility alarm;

alarm

is one of the following network alarms:
BiplrViol — Excessive Bipolar Violations
Fac Alarm — Facility Alarm
OutofServc — Out-of-Service condition
No Signal — No signal has been received
DSU:Device Fail Internal failure in the DSU is detected. (Go to the Test branch for Device Test.)
DSU:Disable DSU transmitter is disabled. (Go to the Control branch to enable the DSU.)
DSUTst:

test

,
init
The DSU is running a test, initiated from
init
.

test

is one of the following tests:
BERT — Bit Error Rate Test
BiL — Bilateral Loopback
Dev — Device Test
DL — Digital Loopback
DT — Digital Test
DTE — DTE Loopback
E-E — End-to-End Test
Lamp — Lamp Test
NetL — Network Loopback
RL — Remote Digital Loopback
TM — Test Mode
init
is one of the following initiators:
DTE — Data T
erminal Equipment
FP — Front Panel (the DCP)
NMS — Network Management System
Ntwk — Network
Remt — Remote DSU
External Alarm A The DSU detects a positive voltage on Pin 23. This alarm condition is defined by the
Ext Leads configuration option.
External Alarm B The DSU detects a positive voltage on Pin 19. This alarm condition is defined by the
Ext Leads configuration option.
Invalid Address A DSU was powered up with an invalid address. Invalid addresses are:
0
— This is reserved for the SDU
192
— This is reserved for the broadcast address
191
— Invalid for a DSU with a DBM because of the reserved 192
broadcast address
255
— Invalid for a DSU with a DBM