Verilink 2100 (34-00187) Product Manual Manual de usuario descargar pdf (Pagina 11)

Installation 2-32100 CSU

Keep Alive

Positions S2-6 and S2-7 are used to select the action that

occurs upon loss of DTE signal, when the unit switches to

the Keep Alive mode on the network line. The choices are

shown in Table 2-C.

Configuration Switch S3

Switch S3 is used to set the configuration parameters listed

in the following paragraphs.

Network LBO

Positions S3-1 and S3-2 set the output signal level to the

transmit data (TXD) from the CSU to the network to the

proper line build out. These values are shown in Table 2-D.

The output level is factory set at 0 dB. It may be attenuated

by 7.5 dB, -15 dB, or -22.5 dB if operating conditions

require that it be changed. The telco should provide the

proper seting to the user. If unsure of the exact setting, then

leave it at 0 dB.

DSX Level

Positions S3-3, S3-4, and S3-5 set the DTE line interface

DSX level to one of the values shown in Table 2-E. The set-

ting should match the cable length from the CSU DTE port

to the attached equipment (cross-connect).

Line Code

Position S3-6 is used to provide AMI/B8ZS conversion from

the DTE to the facility and B8ZS/AMI conversion from the

facility to the DTE or set the line code to be transparent.

Up: Transparent Down: Conversion

Remote Loop

Position S3-7 is used to select the signal sent to the DTE

during a remote loop.

: AIS to DTE Down:Network data to DTE

ACO/Alarm Card (Optional)

The optional; ACO/alarm card monitors the alarm indica-

tors for an alarm active or an alarm clear condition and

provides closure contact points on the rear panel. The corre-

sponding front panel LED lights when an alarm condition is

detected on four different conditions:

• Network AIS (all ones)

• Network LOS (all zeros)

•Network BPVs

• DTE ones density)

The alarm card circuitry scans the status (on or off) of the

alarm indicators ten times a second (100-ms windows). The

card declares an alarm if one or more indicators are on for

100 consecutive 0.1-second samplings (10 seconds). When

this happens, the red Status indicator turns on until no alarm

conditions are detected for more than 100 consecutive 0.1-

second samplings (another 10 seconds).

Table 2-C Keep Alive Settings

Function S2-6 S2-7

Keep Alive is unframed all ones Left Left

Keep Alive is framed all ones Left Right

The Keep Alive signal is the acti-

vation of the line loopback.

Right Left

Right Right

Table 2-D Network Line Build Out

Network LBO S3-1 S3-2

0 dB Down Down

-7.5 dB Down Up

-15.0 dB Up Down

-22.5 dB Up Up

Table 2-E DSX Level

DTE LBO S3-3 S3-4 S3-5

0-133 ft Up Up Down

134-266 ft Down Down Up

12 76543

NET LBO

DTE Level

Line Code

Remote Loop

Figure 2-3 Switch S3

Down

267-399 ft Up Down Up

400-533 ft Down Up Up

534-655 ft Up Up Up

Table 2-E DSX Level

DTE LBO S3-3 S3-4 S3-5

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17 18 19

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