ページ1に含まれる内容の要旨
MARCH 1995
MT720A-232T MT721AE-X21T
MT720A-35T MT722A-232T
MT720AE-X21T MT722A-35T
MT721A-232T MT722AE-X21T
MT721A-35T
Fradswitch-8A (232)
Fradswitch-8A (V.35)
Fradswitch-8A (X21)
Fradswitch-16A (232)
Fradswitch-16A (V.35)
Fradswitch-16A (X21)
Fradswitch-24A (232)
Fradswitch-24A (V.35)
Fradswitch-24A (X21)
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
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FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
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ページ2に含まれる内容の要旨
FCC AND IC STATEMENTS FEDERAL COMMUNICATIONS COMMISSION AND INDUSTRY CANADIA RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication. It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC r
ページ3に含まれる内容の要旨
FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD 1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. 2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura. 3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas. 4. Todas las instrucciones de operación y uso de
ページ4に含まれる内容の要旨
TABLE OF CONTENTS Contents Chapter Page 1. Specifications.....................................................................................................................................................4 2. Introduction ......................................................................................................................................................6 2.1 Overview ............................................................................................................
ページ5に含まれる内容の要旨
FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A 1. Specifications Links (X.25) Characteristics Number of Links 3 Data Rate All the links aggregate up to 2.15 Mbps Interface RS-232/V.24, X.21, or V.35 (selected when you order) Connectors RS-232/V.24 25-pin D-type, female X.21 15-pin, female V.35 34-pin, female Protocol Complies with ITU X.25, LAPB (Blue Book, 1988) Configuration Clocking External clocking for receive and transmit paths Selectable Parameters Frame window (k); Packet window (w); Tim
ページ6に含まれる内容の要旨
CHAPTER 1: Specifications General Indicators (9) LEDs: Power; Main links activity; Sub-channels activity; (3) Loss of synchronization; Error; Overflow; Test Operating Temperature 32 to 122°F (0 to 50°C) Humidity Up to 90%, noncondensing Power Supply Voltage 115- or 230-VAC (depending which model you ordered), 50/60 Hz Consumption 15W Fuse 125 mA, 250V Size MT720A units: 1.7"H x 17"W x 9.5"D (4.4 x 43.2 x 24.1 cm); MT721A and MT722A units: 1.7"H x 17"W x 11.7"D (4.4 x 43.2 x 29.7 cm) Weight MT
ページ7に含まれる内容の要旨
FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A 2. Introduction 2.1 Overview The Fradswitch-8A, Fradswitch-16A, and Fradswitch-24A are combinations of a high-performance X.25/Frame Relay PAD (Packet Assembler/Disassembler) and a Packet Switch, for concentrating and switching data in an X.25/Frame Relay environment. A Fradswitch can connect up to eight, sixteen, or twenty-four asynchronous channels, and up to three synchronous links, and perform packet-switching functions between all links (X.25 to
ページ8に含まれる内容の要旨
CHAPTER 2: Introduction • Routing between several Frame Relay devices or networks (Frame Relay to Frame Relay switching). (See Figure 2-5.) • Connection of devices supporting HDLC protocol to the X.25 or Frame Relay network. (See Figure 2-6.) FRADSWITCH-8A STM LINK X.25 STAT MUX NETWORK X.25 LINK X.25 PUBLIC DATA NETWORK X.25 LINK FRADSWITCH-8A FRADSWITCH-8A Figure 2-1. Fradswitch-8A serving as backbone for private X.25 data networks. 7
ページ9に含まれる内容の要旨
FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A FRADSWITCH-8A STM 64 Kbps X.25 STAT-24 PUBLIC (MX868A) X.25 NETWORK X.25 COMPUTER Figure 2-2. Fradswitch-8A providing X.25 switching and async channel expansion. X.25 NETWORK ACCESS 128 Kbps X.25 PUBLIC NETWORK ASYNC LINK X.25 REDUNDANT NETWORK ACCESS 19.2 Kbps FRADSWITCH-8A ASYNC CHANNELS Figure 2-3. Fradswitch-8A serving as a PAD with redundant link and load sharing. One link configured as async channel. 8
ページ10に含まれる内容の要旨
CHAPTER 2: Introduction (B) ASYNC FRAME FRAME X.25 FRAME RELAY RELAY RELAY NETWORK FRADSWITCH-8A FRADSWITCH-8A (A) Figure 2-4. (a) Fradswitch-8A operating as a switch at the user side: Conversion of Frame Relay to X.25. (b) Fradswitch-8A operating as a FRAD at the user side: Conversion of Frame Relay to async. PRIVATE DATA NETWORK FRADSWITCH-8A FRAME RELAY FRAME FRADSWITCH-8A RELAY FRAME FRAME RELAY FRADSWITCH-8A RELAY Figure 2-5. Fradswitch-8A serving as a backbone for Frame Relay private data
ページ11に含まれる内容の要旨
FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A ETHERNET ETHERNET X.25 OR FRAME RELAY NETWORK BRIDGE BRIDGE TRANSPARENT HDLC TRANSPARENT HDLC X.25 OR FRAME RELAY X.25 OR FRAME RELAY FRADSWITCH-8A FRADSWITCH-8A Figure 2-6. Fradswitch-8A connecting HDLC devices over X.25 or Frame Relay. 2.3 X.25 Link Features When the Fradswitch links are configured for X.25, they operate synchronously at data rates up to 2.15 Mbps. The links interface is DTE or DCE, and the data rate is determined by the external
ページ12に含まれる内容の要旨
CHAPTER 2: Introduction The Fradswitch employs a unique funneling method for controlling network congestion and moderating feeder throughput speed. CCLM and LMI management protocols are supported, and operation is in compliance with ANSI T1.606, T1.619, T1.617 Annex D, and ITU Q.922, Annex A. 2.5 HDLC Link Features The Fradswitch links can be programmed to operate with transparent HDLC allowing computers, bridges, and HDLC communication devices to be connected over X.25 or Frame Relay networks.
ページ13に含まれる内容の要旨
FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A The Fradswitch supports four call-initiation methods, independently selectable for each channel. 1) Manual (regular) call initiation, whereby the user provides all the information required to set up the call by entering an X.28 command. 2) Mnemonic call initiation, whereby the user need only enter a mnemonic (call ID). The channel PAD then retrieves the call-setup information from the Fradswitch’s memory. 3) Automatic call initiation (autocall). The
ページ14に含まれる内容の要旨
CHAPTER 2: Introduction The command facility supports the configuration of both the local and the remote channel PADs. It includes a help function, which provides information on the available PAD commands, and on the purpose and format of each command. The Fradswitch’s command facility can be accessed from any channel, and from any place in the X.25 network. Simultaneous access from several channels is possible, but a warning is given if a user connects to the facility when someone else is alre
ページ15に含まれる内容の要旨
FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A For activities that involve repetitive preparation of the same set of parameters, such as channel configuration, profiles, call IDs, etc., the Fradswitch provides a time-saving duplicate function, which allows copying an already-prepared data set as a basis for the preparation of a new set. Another valuable convenience is the display of reports that summarize the existing data for each type of configurable data item. In addition, on-line help is av
ページ16に含まれる内容の要旨
CHAPTER 2: Introduction • Compression of data stored in the Fradswitch’s nonvolatile memory, to allow maximum use of the available storage capacity. The compression is performed by rearranging the data stored in the memory, to close gaps between data blocks that appear naturally when the stored information is modified. • Resetting and reloading of the default configuration. This function allows a remote supervisor to perform these activities, which would otherwise require the dispatching of ser
ページ17に含まれる内容の要旨
FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A Total number of frames transmitted and received by layer 1 (the physical layer). Total number of information frames transmitted and received by layer 2 (the link control layer). Total number of information frames transmitted and received by layer 3 (the X.25 layer). Current X.25 synchronization status, and the total number of X.25 synchronization losses. The average number of data buffers in the Fradswitch “pool,” and the recorded minimum number of b
ページ18に含まれる内容の要旨
CHAPTER 2: Introduction • LAPB (layer 2) statistics: Total number of I, RR, RNR, REJ, and FRMR frames transmitted and received by layer 2. Number of transmission and reception errors. LAPB state. Current frame size. •X.25 (layer 3) statistics: Total number of I, clear, reset, and restart packets transmitted and received by layer 3. Number of logical group in use. Current packet size. 2.18 Diagnostic Features Upon power-up or after reset, the Fradswitch performs a self-test, during which all its
ページ19に含まれる内容の要旨
FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A 3. Installation This chapter provides mechanical and electrical installation procedures for the Fradswitch. The Fradswitch is delivered completely assembled. It’s designed to be installed as a desktop unit or to be mounted in a 19-inch rack. After installing the unit, refer to Chapter 2 of the Packet Switching Guide for system configuration information and procedures. 3.1 Unpacking Perform a preliminary inspection of the equipment container before
ページ20に含まれる内容の要旨
CHAPTER 3: Installation Ambient Requirements The ambient operating temperature of the Fradswitch should be 32 to 122°F (0 to 50°C), at a relative humidity of up to 90%, noncondensing. 3.3 Fradswitch Hardware Configuration Information 3.3.1 GENERAL INFORMATION The Fradswitch contains three different types of printed circuit boards (see Figure 3-1): • The main board. This board contains most of the Fradswitch circuits, and has two jumpers. • The extension board. • Three main link interface board
