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SL-1
System options 21,51,61,71
System overview
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SL-1 System options 21,51,61,71 System overview Publication number: 553-3001-I 00 Document release: 1 .O Document status: Standard Date: January 29,199O 0 1990 Northern Telecom All right reserved System overview 553-3001-l 00 -. .: .’ .:.
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ii Revision history January 29,199O Standard, release 1.0 \ ‘: :.“‘I j System overview 553-3001-100
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iii About this document This document describes the features and services, hardware and software architecture, and the family of products that comprise Meridian 1. References See the SL-I planning & engineering guide for - Master index (553-3001-000) - System overview (553-3001-100) - Installation planning (553-3001-120) - System engineering (553-3001-151) - Power engineering (553-3001-152) - Sparesplanning (553-3001-153) - Equipment identification and ordering (553-3001-154) See the list of lin
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iv About this document - General maintenance information (553-3001-500) - Fault clearing (553-3001-510) - Hardware replacement (553-3001-520) See the SL-1 XII software guide for an overview of software architecture, procedures for software installation and management, and a detailed description of all Xl 1 features and services. This information is contained in two documents: - XII software management (553-3001-300) - XII features and services (553-3001-305) See the SL-1 XII input/output guide (
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V Contents 1 Meridian 1 2 The Meridian 1 commitment 5 Advanced features 9 System architecture Meridian 1 modular architecture 9 9 Control Switching 9 Peripherals 10 Software architecture 10 Firmware 11 Software 11 Office Data 11 Resident Programs 11 Non-Resident Programs 11 Hardware architecture 13 Common equipment 13 Network equipment 17 Peripheral Equipment 31 Power equipment 32 37 Product description Universal Equipment Modules 37 CPU module (NT8D34) 39 CPU/Network module (NT6D39) 41 43 Netwo
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vi Contents Remote Peripheral Equipment Carrier module (NT8D47) 52 InterGroup module (NT8D36AA) 54 Meridian Mail module (NT6D44) 55 Pedestal (NT8D27AB) 57 Top cap (NT7DOO) 57 Expansion kit (NT8D49) 57 Meridian 1 system options 60 Meridian 1 system option 21A 60 Meridian 1 system option 21 62 Meridian 1 system option 51 64 Meridian 1 System option 61 66 Meridian 1 system option 71 68 List of terms 71 System overview 553-3001-l 00
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1 Meridian 1 Introduction Meridian 1 Communication Systems are a family of digital multiplex voice and data switching systems built upon a foundation of state of the art digital switching equipment and advanced software program control. Meridian 1 systems provide a wide range of sophisticated voice and data services for both Private Branch Exchange (PBX) and Central Office (CO) applications ranging in size from 30 to 60,000 ports. A Meridian 1 Communication System is a single source solution to
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2 Meridian 1 Meridian Modular Telephones, a family of digital telephones that utilize standard twisted pair wiring and support a wide range of data communications options. Meridian 1 LANSTAR, a 2.56 Mbps local area network (LAN) for Macintosh II and IBM PC compatible computers. The Meridian 1 commitment Northern Telecom is committed to meet the needs of our customers by providing systems which guarantee: Continuing product compatibility A high degree of component and system reliability Cost effe
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Meridian 1 3 System reliability Meridian 1 systems are designed and built to meet the highest standards for reliability, resulting in less downtime and increased system availability. In most systems, critical system elements are duplicated to guarantee system reliability. There are two identical Central Processing Unit (CPU) and memory circuits in most system configurations, and both CPUs can access both memory circuits. If one CPU or memory circuit fails, the system automatically switches to th
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4 Meridian 1 systems. A System Monitor is installed in.the pedestal of each column. The System Monitor located in the column containing CPU0 acts as the master system monitor; monitors located in other columns act as slaves. The master polls the slaves and reports their status to the CPU. The master System Monitor is connected to the CPU by an RS232C port located on an SD1 card. Slave System Monitors are connected to the master in a daisy chain fashion with an 8-conductor RJ type connector. Syst
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Meridian 1 5 Ease of installation Every Meridian 1 system is shipped from the factory assembled and equipped to order. Installation effort is reduced to unpacking and positioning equipment, plugging in connectorized cables, ‘and adding customer-specific programming where required. Ease of expansion The modular packaging scheme employed by the Meridian 1 family of products accommodates growth by permitting easy expansion. System expansion simply requires adding one or more UEMs. The modular packa
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6 Meridian 1 ESN The Electronic Switched Network (ESN) group of features supports voice and circuit-switched voiceband data telecommunications for multiple- location customer applications. ESN applications range from a single network node (combined PBX and network switching system) to a widely- dispersed network with up to 256 locations. For more information about ESN, refer to the ESN Feature Document 6400-886 and to the following Northern Telecom Publications: - ESN: 308-3001-100 - BARSmARS: 5
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Meridian 1 7 Meridian Mail voice messaging eliminates telephone tag and wasted calls by allowing detailed messages to be exchanged when parties are unavailable or busy. Guided by easy to follow prompts, a user can leave messages for others, retrieve messages, forward messages, and respond to messages with the touch of a single button. i . .: -. ‘Z.., I :.,-;. . ...: I “T’.’ : - System overview 553-3001-l 00
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8 Meridian 1 , r- h . . . -* _ .’ System overview 553-3001-100 + ..
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9 System architecture Meridian 1 modular architecture An important characteristic of Meridian 1 systems is a modular system architecture. It utilizes an efficient and flexible approach, employing modular construction in all areas of hardware and software, and state-of-the- art commercial and custom components. The result is a system which is highly flexible in terms of operational, maintenance, and administrative characteristics. As demands dictate, any module may be enhanced, singularly or in c
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10 System architecture Peripherals Peripheral equipment provides the analog and digital interfaces for all peripheral devices, and performs analog to digital conversion of all input signals before switching is performed by the Network. Additionally, Peripheral equipment circuits provide the supervisory and transmission functions needed for trunks connected to the external telecommunications network. Meridian 1 systems use a star topology for connecting peripheral devices to the switching equipme
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System architecture I I Firmware These are fundamental programs consisting of hard-wired logic instructions .:; .,..“. _....~ stored in Programmable Read Only Memory (PROM) which manipulate :: j ,‘;-T.>g ->yy I : ;-“‘: , data in the central processor and control input/output operations, error . ..~ . . ,’ : diagnostic and recovery routines. Software Software programs consist of instruction sequences that control call processing, peripheral equipment, administration and maintenance functions. The
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12 System architecture receive output simultaneously. A terminal may be configured as an input only or output only device. Overlay programs provide the system interface for maintenance, service change, and traffic measurement. Each overlay program is independent and has its own specific set of commands and formats. Overlay programs may be run concurrently with normal call processing without interfering with system traffic. There are five main categories of overlay programs: Service Change and Pr
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System architecture 13 a midnight routine or on a conditional basis (i. e. , data dump only occurs if a software service change has been made). It may also be invoked manually via the input/output (I/O) interface to the system. Software Audit This program monitors system operation and gives an indication of the general state of the system operation. The program is concerned mainly with the system software. When a software problem is encountered, the program attempts to clear the problem automati
