Telephone (D-network), function - GF82.70-P-0003C
MODEL 129 with CODE (274) MB D-network telephone with CODE (312) D-network portable CTEL telephone with CODE (313) D-network portable CTEL telephone with CODE (314a) Standard D-network telephone with CODE (316) MB D-network portable CTEL (D2B) with CODE (317) D-network portable CTEL telephone (D2B) with CODE (853) MB standard telephone with CODE (854) MB portable CTEL telephone
MODEL 140 with CODE (274) MB D-network telephone with CODE (312) D-network portable CTEL telephone with CODE (313) D-network portable CTEL telephone with CODE (314a) Standard D-network telephone
MODEL 163 with CODE (853) MB standard cellular telephone with CODE (854) MB portable cellular telephone
MODEL 168 with CODE (312) GSM portable cellular telephone with CODE (317) GSM portable cellular telephone (D2B) with CODE (854) MB portable cellular telephone
MODEL 170 with CODE (312) GSM portable cellular telephone with CODE (313) D-network portable cellular telephone with CODE (314a) Standard D-network telephone with CODE (316) MB GSM cellular telephone (D2B) with CODE (317) GSM portable cellular telephone (D2B)
MODEL 202 with CODE (274) MB D-network telephone with CODE (312) GSM portable cellular telephone with CODE (313) D-network portable CTEL telephone with CODE (314a) Standard D-network telephone with CODE (316) MB GSM CTEL telephone (D2B) with CODE (317) GSM portable CTEL telephone (D2B)
MODEL 202.08 /09 /18 with CODE (854) MB portable CTEL
MODEL 203 with CODE (853) MB standard telephone with CODE (854) MB portable CTEL
MODEL 208 with CODE (274) MB D-network telephone with CODE (316) MB GSM cellular telephone (D2B) with CODE (317) GSM portable cellular telephone (D2B) with CODE (853) MB standard cellular telephone with CODE (854) MB portable cellular telephone
MODEL 210 with CODE (274) MB D-network telephone with CODE (312) GSM portable cellular telephone with CODE (313) D-network portable cellular telephone with CODE (314a) Standard D-network telephone with CODE (316) MB GSM cellular telephone (D2B) with CODE (317) GSM portable cellular telephone (D2B) with CODE (853) MB standard cellular telephone with CODE (854) MB portable cellular telephone with CODE (316) MB GSM cellular telephone (D2B)
MODEL 215 with CODE (317) GSM portable cellular telephone (D2B) with CODE (853) MB standard cellular telephone with CODE (854) MB portable cellular telephone
MODEL 220 with CODE (316) MB GSM cellular telephone (D2B) with CODE (317) GSM portable cellular telephone (D2B) with CODE (853) MB standard cellular telephone with CODE (854) MB portable cellular telephone
Function of digital network
D-network, general
The D-network ( Digital network ) is made out according to the GSM standard ( Global S ystem for M obile Communication.
This allows telephone calls to countries with networks which also operate according to the GSM standard and whose users have a GSM telephone. Moreover, so-called "roaming contracts" between the countries exist to regulate telephone traffic. The countries included in these contracts are listed in so-called "roaming lists".
The D-net itself has a honeycomb-type structure for the greatest possible area coverage for mobile subscribers whereby some areas may no be covered. The individual cells have a radius of 100 m to 35 km. However, the actual value may be less depending on the maximum traffic volume (e.g. in large cities) or the surface characteristics (mountains, buildings, etc.). Transmission problems could occur if the user is located in valleys (dead spot) or in areas with a small number of transmission and reception stations. This can, however, be eliminated by moving to another location. Each cell has up to 16 carrier frequencies which allow up to seven conversations per carrier frequency.
Transmission of the voice and data signals is accomplished digitally in the range of 900 -1900 MHz. It allows increased security against tapping calls and provision of additional services such as:
- Fee display
- conference calls, waiting function
- identification of calling party
- call relaying
Moreover, with ISDN compatibility the D-network offers access possibilities to text and data stations (corresponding adapters required).
The D-network requires the following operating units:
- Transmission and receiving terminal (BTS=B ase Transceiver S tation, per cell)
- Concentrator (BSC=B ase Station C ontroller, radio switching center, from the one cell to the other)
- Switching center (MSC=M obile S ervice Switching Center, from the one cell to the other)
Each transceiver station (BTS) is connected to the associated mobile service switching center (MSC) via a concentrator (BSC). The connection between the base transceiver station (BTS) and concentrator (BSC) is accomplished via radio signal (pulsed signal) and the connection from the concentrator (BSC) to the mobile service switching center (MSC) via lines (permanently-wired 4-conductor cables).
The following units are included in the mobile switching center (MSC):
- (HLR=H ome L ocation R egister)
- (VLR=V isitor L ocation R egister)
- (AC=A uthentication C enter)
- Equipment identification register (EIR=E quipment I dentification R egister). Apart from this the mobile service switching center (MSC) also forms the interface for switching the public service telephone network (PSTN, in Germany to Deutsche Telekom).
The purpose of the units listed is explained in the following examples:
- Telephone (D-network) log-in
- Telephone (D-network) mobile subscriber to public telephone network
- Telephone (D-network) mobile subscriber to mobile subscriber
Each subscriber in the D-network is listed in his mobile service switching center (MSC) or the home location register (HLR) stored for him. The network access authorization of the mobile subscriber is also checked in the authentication center (AC) located there.
Moreover, defective or stolen units are identified in the equipment identification register (EIR). This ensures that such units can be identified immediately when they log into the network. All subscribers from other home location registers (HLR) or other networks are identified in the visitor location register (VLR)
It is possible to select between two versions:
- Permanently installed
- Portable CTEL
| Telephone (D-network) log-in | GF82.70-P-0003-03C | ||
| Telephone (D-network), mobile subscriber on public switched telephone network. | GF82.70-P-0003-04C | ||
| Telephone (D-network) mobile subscriber to mobile subscriber | GF82.70-P-0003-05C | ||
| Telephone (D-network), function | Permanently installed MODEL 129, 140, 202, 210 with CODE (274) MB D-network telephone with CODE (314a) Standard D-network telephone MODEL 170 with CODE (314a) Standard D-network telephone MODEL 208 with CODE (274) MB D-network telephone |
GF82.70-P-0003CE | |
| MODEL 129, 202, 208, 210, 215, 220 with CODE (316) MB D-network telephone (D2B) |
GF82.70-P-0003CA | ||
| MODEL 129, 163, 202.08 /09 /18, 203, 208, 210, 215, 220 with CODE (853) MB standard telephone | GF82.70-P-0003CB | ||
| Telephone (D-network), function | Portable CTEL MODEL 129, 140, 170, 202, 208, 210 with CODE (312) D-network portable CTEL telephone with CODE (313) D-network portable CTEL telephone Model 168 with CODE (312) D-network portable CTEL telephone |
GF82.70-P-0003CF | |
| MODEL 129, 168, 202, 208, 210, 215, 220 with CODE (317) D-network portable CTEL telephone (D2B) | GF82.70-P-0003CC | ||
| MODEL 129, 163, 168, 202.08 /09 /18, 203, 208, 210, 215, 220 with CODE (854) MB portable CTEL telephone | GF82.70-P-0003CD | ||
| Start-up/accepting call/completing telephone call (D-network), function | GF82.70-P-2002C | ||
| Shut down/terminating telephone call (D-network), function | GF82.70-P-2003C |