Полное описание
Серверы удаленного доступа Lucent/Livingston PortMaster 3
48-ми портовый сервер доступа. Может быть снабжен до 48 (или 50) Kflex/V.90 56k цифровыми модемами (6 карт). Поддержка ISDN, 56k цифровых или аналоговых линий. 4мегабайта оперативной памяти (поддерживается до 32 Мб)
The PortMaster 3 Integrated Access Server consolidates digital modem technology, Frame Relay, ISDN Primary Rate Interface (PRI), and T1, channelized T1, or E1 services for seamless InterNetworking Systems.
ISDN PRI Service. PRI is an ISDN service that connects your site to a telephone company's central office.
- In North America, PRI is transmitted over 1.544Mbps T1 lines and consists of twenty-three 64Kbps bearer (B) channels for the transmission of voice and data and one 64Kbps data (D) channel for ISDN call control and signaling.
- In Europe, PRI is transmitted over 2.048Mbps E1 lines and consists of thirty 64Kbps B channels for the transmission of voice and data and one 64Kbps D channel for ISDN call control and signaling. Channelized T1 Service. The PortMaster 3 also connects to channelized T1 circuits for dial-up access supporting twenty-four 56Kbps data channels. When used on channelized T1 lines, the PortMaster 3 has the unique ability to automatically answer a modem or ISDN call using the same phone number.
Fractional T1 service. The PortMaster 3 operates over T1 and E1 lines in fractional data rates selectable in any multiple of 64Kbps (T1 or E1 lines) up to the line capacity. This feature is frequently used for Frame Relay or point-to-point communications.
Fully Integrated Digital Solution. The PortMaster 3 reduces the complexity of LAN-to-LAN internetworking and InterNetworking Systems by providing a fully integrated digital solution. It offers the functionality of channel service units (CSUs), channel banks, digital modems, communication servers, and multiprotocol routing in a single rack-mountable chassis.
Multiple Access. The PortMaster 3 comes with one or two T1/E1 ports, one Ethernet port with three connector types, one asynchronous console port, and six expansion slots for optional digital modem cards. Up to six digital modem cards-for a maximum of 60 modems-can be installed in each chassis, with 8 or 10 modems per card.
Front Panel
Five-Section DIP Switch
DIPSwitch | Controls | Switches UP | Switches DOWN |
|---|---|---|---|
| 1
| Console mode
| C0 acts as a console
| C0 acts as an asynchronous RS-232 port
|
| 2
| Net boot mode
| PortMaster 3 attempts to boot from the network using RARP and TFTP
| PortMaster 3 boots from internal flash memory
|
| 3
| Reserved for future use
| Not Applicable
| Should be left DOWN
|
| 4 and 5
| Selection of Ethernet connector
| 10BaseT is selected
| BNC is selected
|
| If 4 is DOWN and 5 is UP, AUI is selected
| |||
Note: When Ethernet DIP switch positions are changed, you must turn the power off and on in order for the new settings to be recognized.
LED Descriptions
Table 1-2 and Table 1-3 describe LED behavior.
Green | Red | Description |
| OFF
| OFF
| The PRI line is disabled. Typically only occurs while the unit is booting.
|
| OFF
| ON
| There is no physical synchronization with the switch.
|
| ON
| ON
| The port is physically synchronized with the switch, but D channel signalling is not up.
|
| ON
| OFF
| Line is fully operational.
|
PRI Status LEDs
LED | Description |
|---|---|
| System
| This LED provides three types of diagnostic information: During the initial hardware self-test, the LED blinks three times per second. After the power-on self-test is successfully completed, and while the operating system is loading, the LED blinks at one-second intervals. When the system is fully operational, the LED remains on, blinking off once every five seconds.
|
| Link
| This LED is on when the system has link integrity to a 10BaseT hub.
|
| Network Activiti
|
Lucent Technologies Livingston PortMaster PM-3D-1E Remote Access Server (RAS)/w 6x10 modem board MDM-56K-10, retail (сервер удаленного доступа)
- Артикул: 1274
- Наличие: Есть в наличии
-
Цена: 180009 руб.