BusinessPhone Communication Platform 4.0
Fault Tracing ASB 150 02 > Procedures

## Check on service display DT 288, DT 360, DT 368

The portable can be switched to service display mode (type DT 310 does not support this function) displaying information regarding the radio interface like BS number, carrier, time slot number, RSSI etc.

When the service display is active, calls cannot be made and incoming calls will terminate the service display mode. To make this display visible while calling, first setup the call and then, via the `R(inquiry)' menu, access the service display menu.

Note

Activating the service display reduces the normal functioning of the portable. It is therefore recommended only to use this facility in exceptional cases, e.g. when service requires such.

#### Activating Service Display Mode DT 360 (A-protocol)

1. Switch off portable
2. Switch on portable with special code:
   (Press the 3 keys simultaneously for more than 1 second).

- A `DCA-Service' menu will appear in the Preference menu. This menu can be removed by switching-off the portable followed by a normal switch-on.

1. Access Preferences menu: 2 x down, yes.
2. Access DCA-Service menu: 1 x up, yes.
3. Access wanted service display option.

The DCA-Service menu has six options available to display different types of information.

#### Explanation of Service Displays

Data is always displayed in hexadecimal numbers. The Base Station number relates to the physical connection in the central Unit.

Note

A portable is always blind for the two adjacent time slots. For example, a portable is locked on a Base Station on TS 5. If it approaches a Base Station that has only one active channel (traffic or beacon) on TS 4 or TS 6, the portable will not see that Base Station. The display remains unchanged until the current channel or the channel of the second Base Station changes. Consider this when using the menu's below.

##### Link Info

The Link Info option can be used for site surveys and commissioning of the system. All information regarding the traffic/beacon channel to which the portable is locked, is visible. The signal strength theoretically varies between /00 and /3F. In practice, values will lie between /07 and /37, of which /07 means noise, /37 means optimum quality. Typical values are /20 .. /29.

##### All - FP + RSSI

This menu can be used to check the traffic that is offered on a certain location. It shows the number of Base Stations within reach of the portable in order of their respective signal strength. The portable displays a list of up to 7 different Base Stations, the maximum a portable can see.

##### FP - Info

This menu allows scrolling through the Base Stations (/00../FF) list. The default Base Station is the first Base Station mentioned in the All-FP+RSSI display; the one with the highest signal strength. By pressing `down/up', you can display other Base Stations. When a Base Station is not in the portable list, the display remains blank. If it is, the display shows the data as specified in the lines above. `N' may change during the display if another Base Station from the portable list is getting a higher/lower signal strength than the one currently displayed.

##### Channel Info

Not applicable to maintenance

##### Time Slots

Not applicable to maintenance

##### Select PUN

This menu is useful for testing purposes when more systems cover the same area. It allows a forced selection of one system on a portable that is programmed for both systems. By selecting a different PUN an engineer can test Base Stations of different systems on the same spot without having to re-initialize his portable.

When `A' is selected, the portable will automatically select systems for which it has access rights. After switching on, the portable is always set to automatic selection.

#### Activating Service Display Mode DT 368 (GAP-protocol)

1. Switch off portable
2. Switch on portable with special code:
   (Press the 3 keys simultaneously for more than 1 second).

- A ‘LinkInfo’ menu can then be accessed via the Info - DCA Service menu. This menu cannot be accessed after a normal switch-on.

1. Access Info - DCA Service menu.
2. Access Linkinfo menu.

Note

It is also possible to access the DCA Service menu when the phone is ‘off-hook’ ie during a call.

The DCA-Service menu has two options available to display different types of information.

##### Link Info

The link info menu has two display options which can be selected by pressing either up or down. The following display is entered by pressing up:

The following display is entered by pressing down:

The Link Info option can be used for site surveys and commissioning of the system. All information regarding the traffic/beacon channel to which the portable is locked, is visible. The signal strength theoretically varies between /00 and /3F. In practice, values will lie between /07 and /37, of which /07 means noise, /37 means optimum quality. Typical values are /20 .. /29.

#### Activating Service Display Mode DT 288 (GAP-protocol)

1. Switch portable ON
2. Press:
3. Press:
   one after the other until you reach DevServices. Here you will find the Link Info, the FP Info, the Display Tests, Hardware conditions.

Revision: F © Ericsson Enterprise 2003