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 remote access 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

 

Table 1-1 DIP Switch Functionality

DIP Switch	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

 

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  

System, Link, and Network Activity 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 Activity	This LED blinks to indicate Ethernet traffic. During heavy traffic, this light might appear solid due to its rapid blinking.

Rear Panel

• A power switch
• A user-serviceable fuse on the AC version
• An AC or DC power receptacle
• Six slots for digital modem cards, capable of supporting up to 60 modems
• One or two T1/E1 ports for channelized T1, T1, E1, or PRI connectivity, each with a pair of LEDs
• An asynchronous console port
• A five-section DIP switch with LED
• An Ethernet port with connectors for a 10Base2, AUI, or 10BaseT cable
• An alarm LED on the DC version (not shown in the figure)
• A dual redundant power supply on the DC version (not shown in the figure)

PortMaster 3 Product Line

 Table 1-5 lists digital modem cards available for use with the PortMaster 3.  

Table 1-5 Digital Modem Cards for the PortMaster 3

Model	Description
MDM-PM3-8	8-port digital modem card
MDM-PM3-10	10-port digital modem card

PortMaster 3 Software

The PortMaster 3 operates with ComOS version 3.5 or later.

To configure the PortMaster, you can use either of the following:

• Command Line Interface. If you are using the command line interface to configure the PortMaster 3, refer to the PortMaster Command Line Reference and the PortMaster Configuration Guide for instructions.
• PMconsole Software. PMconsole guides you through configuration using a simple graphical user interface (GUI). It is available for Windows 95, Windows NT 4.0 or later, and for many versions of UNIX. You can install PMconsole from the PortMaster Software CD or from the Livingston FTP site.

Refer to the PMconsole for Windows Administrator's Guide for configuration instructions.

Note ¯ You must use the command line interface to configure certain ComOS features such as the Open Shortest Path First (OSPF) protocol and the Border Gateway Protocol (BGP) on the PortMaster 3.