JPH028242U - - Google Patents
Info
- Publication number
- JPH028242U JPH028242U JP1988086403U JP8640388U JPH028242U JP H028242 U JPH028242 U JP H028242U JP 1988086403 U JP1988086403 U JP 1988086403U JP 8640388 U JP8640388 U JP 8640388U JP H028242 U JPH028242 U JP H028242U
- Authority
- JP
- Japan
- Prior art keywords
- line
- carrier
- receiving
- transmitting
- modem
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
Description
第１図は本考案に係る４線式全二重モデムのア
ナログ・ループバツク・テスト時にリモート側モ
デムとして作用する際の構成例を示す図、第２図
は従来のモデムにおけるアナログ・ループバツク
・テスト時にリモート側モデムとして作用する際
の構成例を示す図である。
１……受信回線、２……復調部、３……送信回
線、４……変調部、５……パス、６……テスト制
御部、７……自動利得制御回路（ＡＧＣ回路）。
Figure 1 shows an example of the configuration of a 4-wire full-duplex modem according to the present invention when it acts as a remote modem during an analog loopback test, and Figure 2 shows an example of the configuration when a conventional modem operates as a remote modem during an analog loopback test. FIG. 2 is a diagram showing an example of a configuration when acting as a remote modem. DESCRIPTION OF SYMBOLS 1... Reception line, 2... Demodulation section, 3... Transmission line, 4... Modulation section, 5... Path, 6... Test control section, 7... Automatic gain control circuit (AGC circuit).
Claims (1)
ループバツク・テスト時にリモート側モデムとし
て動作して、上記受信回路からの受信キヤリアを
送信キヤリアとして折返して前記送信回線に送出
する４線式全二重モデムにおいて、 前記受信回線からの受信キヤリアのレベル変動
を検出し、このレベル変動を補償する自動利得制
御回路を前記受信回線からの信号入力段に設け、
前記送信回線に送出する送信キヤリアのレベルを
一定化することを特徴とする４線式全二重モデム
。[Scope of claim for utility model registration] Analog and
In a 4-wire full-duplex modem that operates as a remote modem during a loopback test and loops back the received carrier from the receiving circuit as a transmitting carrier and sends it to the transmitting line, the level fluctuation of the received carrier from the receiving line an automatic gain control circuit for detecting and compensating for this level fluctuation is provided at the signal input stage from the receiving line;
A four-wire full-duplex modem characterized in that the level of a transmission carrier sent to the transmission line is made constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988086403U JPH028242U (en) | 1988-06-29 | 1988-06-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988086403U JPH028242U (en) | 1988-06-29 | 1988-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH028242U true JPH028242U (en) | 1990-01-19 |
Family
ID=31311041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988086403U Pending JPH028242U (en) | 1988-06-29 | 1988-06-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH028242U (en) |
-
1988
- 1988-06-29 JP JP1988086403U patent/JPH028242U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2066420A1 (en) | Dual mode automatic frequency control | |
| CA2040473A1 (en) | Facsimile apparatus comprising cordless telephone set | |
| WO1990004297A3 (en) | Local area network modem | |
| EP0701322A3 (en) | AM receiver | |
| CA2062776A1 (en) | Digital automatic gain control | |
| CA2003207A1 (en) | Relay receiver | |
| JPH028242U (en) | ||
| EP0173526B1 (en) | Digital signal repeater including means for controlling a transmitter | |
| JPS641340A (en) | Base station selecting system | |
| CA2072335A1 (en) | Radio repeater | |
| JPS6324729A (en) | Infrared transmitter/receiver | |
| JPS55161430A (en) | Radio communicating system | |
| JPH02134756U (en) | ||
| JPS62152527U (en) | ||
| JP2755734B2 (en) | Wireless telephone equipment | |
| JPH0243033U (en) | ||
| JPH0136371Y2 (en) | ||
| EP0376574A3 (en) | Franking system | |
| JPS6115849U (en) | telephone equipment | |
| JPS57133757A (en) | Howler tone transmission system in time division electronic exchanger | |
| JPH0136370Y2 (en) | ||
| JPS6280448U (en) | ||
| JPS6338435U (en) | ||
| JPS61187161U (en) | ||
| JPH01243695A (en) | Key telephone system |