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COMSPHERE 3500 Series Data Service Units
3-2 January 1998 3510-A2-GN32-50
TEST
REM
PASS
FAIL/STR/DSBL
OK OS/NS
TXD RXD RTS CTS DSR LSD
103 104
105 106
107 109
2.4/4.8
19.2/38.4
9.6
56/64
TP
LL
DL RL
3510
496-12301-01
SPEED
Figure 3-1. Model 3510 Faceplate
Table 3-1
(1 of 3)
3500 Series Indicators and Switches
Name
Definition Function
OK Normal Operation This green indicator lights when the DSU is
connected to the digital network or LADS and is
operating normally. It goes Off if the OS/NS
alarm indicator is active.
1
OS/NS Out-of-Service/No Signal This red indicator signals a network failure:
OS – Slow flash when Out-of-Service or
Out-of-Frame messages are received from
the network.
NS (No Signal) – Rapid flash when DSU is
not receiving signals from the network.
TEST Test This yellow indicator lights whenever the digital
network or a remote DSU initiates testing, or the
local TP, LL, DL, or RL key is pressed to start
testing. The test indicator flashes while tests are
being set up or taken down.
REM Remote This yellow indicator lights whenever a test
request is received from a remote DSU or the
digital network.
1
If the DSU has been placed in a Network Loopback, then both the OK and OS/NS indicators will be lit (the
TEST and REM indicators will also be lit).