ZyXEL Communications U-1496 series Spezifikationen PDF herunterladen (Seite 18)

E/LZB 119 1889 R1A OPERATION

Site Activity Monitoring

The SIM monitors the activities of the site by

monitoring the activity information on the BSL. The SIM

continually reports this data to the System Manager when

the System Manager’s Site Monitor screen (screen 32) is

being viewed (so that the screen can be continually

updated).

Activity Records

The SIM monitors the activities of the site by

monitoring the activity information on the BSL. From this

activity information, the SIM generates activity records (for

events such as channel assignments, unit enable/disable

requests, or alarm state changes). Activity reporting can be

turned on or off for each category of activity. Activity

records are generated and stored by the SIM for later batch

retrieval and processing by the System Manager. The

default value for the maximum number of records that can

be stored by the SIM is 16,384. The value of the Activity

Dump Threshold parameter specifies the number of records

that must accumulate before the System Manager is notified

to retrieve the records (SIM default is 1000 records).

SYSTEM MANAGER DATA TRANSFERS

The sequence of events involved in data transfers

between the SIM and the System manager depends upon

whether modems are used or not, and whether the

connection is a dedicated or dial-up line.

Modem Connection

The following sequence describes the steps required to

establish a SIM-initiated modem connection between the

SIM and the System Manager.

1. The SIM resets the DTR low.

2. After a one second wait, the modem is put into the

command mode and initialized.

3. A dial-up process is performed. If the modem

interface is a dedicated line, no phone number is

dialed.

4. After a one second wait, the SIM sets the DTR high

and starts testing the DCD line ten times per

second.

5. The SIM continues testing the DCD line ten times

per second for the period of time specified by the

connectTimeout variable (default = 300 seconds).

6. If a response is not detected on the DCD line by the

time the connectTimeout interval expires, the SIM

issues a Hang-Up command to the modem and

starts a waiting interval specified by the

connectRetryTimeout variable (default = 30

seconds).

7. During the connectRetryTimeout interval, the SIM

tests the DCD line one time per second, looking for

a response from the System Manager.

8. If no response from the System Manager is

received by the time the connectRetryTimeout

variable has expired, the connection process is

restarted.

Password Exchange

Once the modem or direct connection between the SIM

and the System Manager is established, the password

exchange takes place. If the SIM initiated the connection, it

will send the password to the System Manager. If the

System Manager initiated the connection, it will send a login

message containing the password to the SIM.

Initialization Sequence

If (for a SIM-initiated connection) the SIM receives a

positive acknowledgment from the System Manager, or (for

a System Manager-initiated connection) the System

Manager login message is valid, the initialization sequence

can start.

The initialization sequence consists of requesting the

following information from the System Manager:

Time

Special Bitmap

RF Bitmap

Data Bitmap

Digital Voice Bitmap

Modem Bitmap

Site Parameters

Site Device Database

GID Database

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