This will ensure that your modem is isolated from the other equipment plugged into the same telephone line. Ideally your modem should be plugged directly into the telephone jack. Telephone extension cords and telephone adapters may degrade the quality of the connection which can result in low quality, slow access or even disconnections. If your modem shares a telephone line with a telephone, and someone lifts the telephone handset while you are logged on, the modem connection will likely be dropped. If you are accessing the Internet from an office, and there are a number of staff each with telephone numbers, it is likely that your telephone system uses PABX equipment.
PABX equipment is well known for the problems that it can cause with modem connections.
Contact to your office IT manager or your Telstra business representative to arrange a direct telephone line for your modem that bypasses the PABX equipment. Therefore we recommend that you disable Call-Waiting before connecting to the Internet to avoid possible disconnection. When a mobile telephone is in use, the communications between it and the nearest base station can interfere with your modem. Even when your mobile phone is switched on but not in use, it still regularly communicates with the base station, this may also interfere with your modem. Telstra recommends that you move your mobile phone away from your modem, possibley into another room while you are online to avoid this interference.