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Network Type:

Form Factor:

Stackable?

Rack Mountable?

Line Rate:

Framing:

Line Code:

Power Requirement:

Network Interface:

DTE Interface:

Integrated Diagnostic Tools?

Management Utilities Included?

Help with Channel Service Units (CSU) and Data Service Units (DSU) specifications:

General Specifications
   Network Type:       
   Your choices are...         
   DDS       Digital Data Service (DDS) was the first digital service made available to the general public.  It operates at different rates from 2.4 kbps to 64 kbps.   
   ATM       Asynchronous Transfer Mode (ATM) is a high-speed network technology that uses fiber optic or CAT-5 copper cables. It can carry the three different types of traffic: audio, video and data. It transmits cells rather than frames. A cell is fixed packet that is 53 octets long. Physically it is a point-to-point switched network. The basic ATM runs at 155 Mbps. Some implementations can run as high as 660 Mbps. The basic desktop standard runs at 25 Mbps. 
   E1 / FE1       E1 or Fractional E1 is the European format for digital transmission, similar to the T1 system used in the United States.  E1 carries signals at a rate of 2 Mbps, and uses 32 channels at 64 kbps. Fractional E1 is a line that does not use all the 32 channels. 
   E3       E3 is the European designation for T3, a long-distance, point-to-point communications circuit service that operates at 44 Mbps and can carry 672 channels of 64 kbps. 
   Frame Relay       Frame relay is a packet switching protocol for connecting devices on a Wide Area Network (WAN). Frame relay networks in the U.S. support data transfer rates at T11 (1.544 Mbps) and T3 (43 Mbps) speeds. 
   SMDS       Switched Multimegabit Data Services (SMDS) is a high-speed switched data communications service offered by telephone companies that enable organizations to connect geographically separate Local Area Networks (LANs) into a single Wide Area Network (WAN). 
   T1 / FT1       T1 is a dedicated phone connection supporting data rate of up to 1.544 Mbps. A T1 line actually consists of 24 individual channels, each of which supports 64 kbps second. Each of these channels can be configured to carry voice or data traffic. Most telephone companies allow you to buy just some of these individual channels, known as fractional T1 access. 
   T3       T3 is a dedicated phone connection supporting data rate of about 44 Mbps. A T3 line actually consists of 672 individual channels, each of which supports 64 kbps. 
   Other       Other, not listed, network type. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Form Factor:       
   Your choices are...         
   Chip       The network equipment is a chip. 
   Board       The network equipment is a board or card. 
   Module       The network equipment is a stand alone and enclosed. 
   Other       Any other form factor not listed. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Stackable?       The network equipment is stackable. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Rack Mountable?       The network equipment is rack mountable. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
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Performance
   Line Rate:       The network transmission speed in bits/second. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Framing:      Data Framing defines the general structure of a data packet or frame.  A packet, in general, consists in a preamble section, one or more sub frames, error checking information, data link information, and other sections that are a function of the type of network.
   Your choices are...         
   SF / D4       Superframe Format (SF) is a DS1 framing format that assembles 12 individual DS1 frames into a single Superframe with a fixed 12-bit frame pattern. A D4 channel bank uses SF framing. 
   ESF       Extended Superframe Format (ESF), also known as Extended Superframe, is a DS1 framing format in which 24 individual frames are combined. Of the 24 frame bits available, 6 are dedicated to frame alignment, 12 are used as a 4 kbps data link, and 6 are used to transmit a cyclic redundancy check code (CRC-6) for payload block error detection. The data link can be used to send performance statistics, alarm status, and loopback test commands. 
   SF / ESF       The network supports both Superframe and Extended Superframe framing. 
   Auto Detection       The device can detect the type of framing used by the transmission network. 
   Other       Other, not listed, framing type. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Line Code:      Line code (or encoding formats) refers to the methods used to represent the zeros and ones of digital systems for transmission. The zeros and ones are transmitted as two different voltage levels.  A zero is a space, and a one is a mark.
   Your choices are...         
   AMI       Alternate Mark Inversion (AMI) is a line code that conveys binary digits in which successive binary ones are represented by signal pulses that alternate in positive and negative polarity. Binary zeros are represented by the absence of a pulse. The terms Bipolar and Pseudo-ternary are also used to describe AMI. 
   B3ZS       Bipolar with three-Zero Substitution (B3ZS) is a line coding technique that uses bipolar violations to substitute for three consecutive zeros. 
   B7ZS       Bipolar with seven-Zero Substitution (B7ZS) is a line coding technique. If there are more than seven consecutive zeros in the transmission, one of them is replaced with a "one." 
   B8ZS       Bipolar with Eight Zero Substitution (B8ZS) is an AMI line code that uses a unique code to replace occurrences of eight consecutive zero signal elements. Each block of eight successive zeros is replaced by the code 000VB0VB, where V represents a pulse that is a bipolar violation and B represents a pulse conforming to the AMI rule. The use of B8ZS on a circuit provides clear channel operation without any restrictions on data content. 
   HDB3       High-density Bipolar-3 zeros (HDB3) is a line code commonly used in Europe and Japan that is based on the AMI coding. In this case a string of four consecutive zeros is replaced with sequences containing one or two pulses. In each case, the fourth zero is replaced with a code violation. In addition, successive violations are of alternate polarity. 
   Other       Other, not listed, line codes. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Power Requirement:       
   Your choices are...         
   230 VAC       The unit operates at 230 volts AC. 
   115 VAC       The unit operates at 115 volts AC. 
   48 VDC       The unit operates at 48 volts DC. 
   24 VDC       The unit operates at 24 volts DC. 
   Other       Other, not listed, voltages. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Physical Interfaces
   Network Interface:       
   Your choices are...         
   RJ-48C       RJ-48C is a connector that has the same physical interface (8-pin modular plug) as the RJ-45 connector, but with different electrical and wiring standards. 
   DB-15       Similar in appearance to a CAPITOL D, D-Subminiature connectors are generally referred to by the number of pins or sockets they have. The design of these connectors varies little between manufacturers, except for the color of the shell. 
   DB-25       Similar in appearance to a CAPITOL D, D-Subminiature connectors are generally referred to by the number of pins or sockets they have. The design of these connectors varies little between manufacturers, except for the color of the shell. 
   BNC       The BNC is essentially a miniature version of the C connector, which is a Bayonet version of the N connector. BNC connectors are available in both 50 and 75-ohm versions.  Both versions can mate. The 50-ohm designs operate up to a frequency of 4 GHz. BNC connectors are used in many applications, some of which are flexible networks, instrumentation, and computer peripheral interconnections. 
   Other       Other, not listed, interfaces. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   DTE Interface:       
   Your choices are...         
   V.35       The V.35 interface was originally specified by Comité Consultatif International Téléphonique et Télégraphique (CCITT), now known as ITU, as an interface for 48 kbps line transmissions. It has been adopted for all line speeds above 20 kbps, and seems to have acquired a life of its own. It was discontinued by CCITT in 1988, and replaced by recommendations V.10 and V.11. V.35 is a mixture of balanced (like RS422) and common earth (like RS232) signal interfaces. 
   RS442       RS422 is a balanced serial interface for the transmission of digital data. It was designed for greater distances and higher transfer rates than RS232. 
   RS530       RS530 standard is based on a 25-pin connection, it works in conjunction with either electrical interface RS422 (balanced electrical circuits) or RS423 unbalanced electrical circuits). RS530 defines the mechanical/electrical interfaces between DTEs and DCEs that transmit serial binary data, whether synchronous or asynchronous. 
   DSX-1       Digital Cross-connect, level 1 (DSX-1).  A point where DS1 (1.544 Mbps. 24 voice. T1 system) signals are cross-connected between equipment. 
   X.21       The X.21 interface was recommended by the Comité Consultatif International Téléphonique et Télégraphique (CCITT), now known as ITU in 1976. It is defined as a digital signalling interface between customer's (DTE) equipment and carrier's equipment (DCE). 
   HSSI       High-Speed Serial Interface (HSSI) is a serial interface that supports transmission rates up to 52 Mbps. It is used to connect routers on local area networks with wide area networks over a high-speed line. 
   ISDN Port       Connector or port for ISDN networks 
   SCSI       SCSI (Small Computer System Interface) is a parallel interface standard used by Apple Macintosh computers, PCs, and many UNIX systems for attaching peripheral devices to computers. 
   Other       Other, not listed, interfaces. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Features
   Integrated Diagnostic Tools?       The unit has integrated tools for self-diagnostics and testing. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Management Utilities Included?       Utilities used to operate and manage the network such as Simple Network Management Protocol (SNMP), remote management utilities, predictive failure analysis, system monitoring, etc. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
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