Channel Service and Data Service Unit Devices (CSU and DSU) Specifications

Performance


	Line Rate:		The network transmission speed in bits/second.
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	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.
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	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.
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	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.
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	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.
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	Power Requirement:
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	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.
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Physical Interfaces


	Network Interface:
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	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.
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	DTE Interface:
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	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.
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