Verilink 2100 (34-00187) Product Manual - Manual (Page 17)

Operation 3-1 2100 CSU
3. Operation
Introduction
This chapter contains the general operation instructions for
the TxPORT 2100 CSU. The unit is operated manually by
using the front panel controls and indicators (described in
this chapter) and configuration Switch S2 (described in the
Installation chapter).
Front Panel Descriptions
The 2100 CSU uses LED indicators to convey major alarm
conditions and looping status. The front panel contains 11
LED indicators, a test switch, and a set of bantam test jacks.
The following paragraphs describe these controls and indi-
cators and are referenced to the illustration on this page.
General Status Indicators
1. STATUS: The CSU has two LED indicators on the
front panel bezel that are exposed whether the access
door is open or closed. These general status LEDs pro-
vide a quick check of the CSU’s operating condition
(Go or No Go).
If neither LED is lit, the unit is not powered. If the
green LED is lit, the unit is powered and functioning
normally. If the red LED is lit, there is a line fault which
exceeds alarm thresholds or another type of unit failure.
The problem can be isolated by further examination of
the other front panel LEDs as described below.
Alarm Controls and Indicators
2. ACO: This red LED lights whenever the alarm cut off
switch is in the right (On) position (when the alarm
relay contacts are disabled).
3. ACO SW: The alarm cut off switch controls the alarm
relay circuitry. If the switch is placed in the right On
position, this circuitry is deactivated. The left Off posi-
tion enables the contacts to report alarm conditions.
4. BPV: This red LED lights (0.1 second minimum) for
each occurrence of bipolar violations from the network.
5. LOS: This red LED lights constantly when a loss of
signal condition is detected from the network.
6. AIS: This red alarm indication signal LED lights con-
stantly if an unframed all-ones condition is detected
from the network.
7. DENSITY: This red LED lights constantly if the ones
density from the equipment is less than 12.5 percent or
if there is a loss of signal.
Test Controls and Indicators
8. LOOP: This yellow LED lights constantly when the
network interface is in a line loopback.
Figure 3 -1 2100 CSU Front Panel
LOC FAR
ACO SW
ACO
LOOP
BPV
LOS
AIS
DENSITY
SET
RESET
ERR
7
6
5
4
3
2
1
S2
FRM
NET
MON
TO
DTE
TO
NET
MON
FRM
DTE
3
2
4
1
5
6
8
7
9
10
11
12
13
2100
CSU
T R A N S P O R T
®