ADTRAN 4200659L2 User Manual
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List of Tables

Table 2-1.

DC Connector Symbol Definitions ...................................................................

2-3

Table 2-2.

LED Conditions for Active Cards ..................................................................

2-14

Table 2-3.

LED Conditions for Standby Cards.................................................................

2-15

Table 2-4.

T1/E1 LED Conditions ...................................................................................

2-16

Table 3-1.

Syslog Severity Levels ..................................................................................

3-37

Table 7-1.

Configuration Requirements for Circuit Recovery ...........................................

7-4

Table 9-1.

TL1 Commands ................................................................................................

9-6

Table 9-2.

MX2800 STS-1 Alarm Events .......................................................................

9-10

Table 9-3.

MX2800 STS-1 Informational Events ............................................................

9-12

Table 9-4.

TL1 Error Codes..............................................................................................

9-13

Table A-1.

Craft Port Pin Assignments ..............................................................................

A-1

Table A-2.

LAN Port Pin Assignments .............................................................................

A-2

Table A-3.

Modem Port Pin Assignments ..........................................................................

A-2

Table A-4.

Amp Pin Assignments ......................................................................................

A-3

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Chapter 1 Introduction

PRODUCT OVERVIEW

The MX2800 STS-1is a SONET multiplexer that consolidates T1 and E1 signals into anSTS-1signal. This unit provides a costeffective, versatile tool for combining independent T1s or E1s over the sameSTS-1carrier.

Embedded SNMP (simple network management protocol) and Telnet are available through the modem port using SLIP/PPP or through the 10BaseT ethernet port. Using the Management Information Base II (MIB II), RFC 1595 standards, and an ADTRAN enterprise MIB, the MX2800 STS-1can be configured, monitored, and diagnosed with standard SNMP network management programs such as Hewlett Packard’s HP OpenView™ and Cabletron’s Spectrum™. In addition, the SysLog Host Daemon allows remote monitoring, collecting, and logging of MX2800STS-1events in real time. This information can be useful during installation setups and/or troubleshooting.

Complete configuration, diagnostics, and performance monitoring are available through SNMP, Telnet, or a VT-100terminal interface. This connection can be made via ethernet, a local EIA232 link, or through thebuilt-inV.34 modem (see the note at the end of this section onpage 1-2).The modem candial-outa “cry for help” for units located in unmanned facilities. The MX2800STS-1is designed for either desktop use or for installation in a19-inchor23-inchrack.

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The major features of the MX2800 STS-1are as follows:

Built-in1:1 redundancy

Hot-swappablecontroller cards

Independent, dual-loadsharing, redundant power supplies

Embedded SNMP and Telnet management through 10BaseT ethernet or SLIP/PPP dialup

Detailed performance monitoring for local and remote units

Simplified configuration through the VT-100terminal menu structure

Integrated V.34 modem for dial-upanddial-outaccess (see the following note)

Capable of backhauling multiple service types (T1/E1)

AC or DC power

VT Hairpining

VT cross-connectto any DS1

NEBS Level 3 compliant

Standard 10-yearwarranty

Information regarding the built-inmodem applies to the following list of part numbers: 4200659L1, L2, L3, and L4.

Controller Card 1:1 Redundancy

The MX2800 STS-1supports twohot-swappablecontroller cards which provide 1:1 redundancy for the T1 andSTS-1signals as well as theSTS-1connections. With two cards installed, the MX2800STS-1can recover from circuit or network failure, depending on the configuration. SeeChapter 7, Circuit and Network Redundancy for more information.

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Chapter 1. Introduction

STS-1OVERVIEW

The MX2800 STS-1multiplexer delivers up to 28 T1s or 21 E1s via the SONET Synchronous Transport Signal Level One(STS-1)at a speed of 51.84 Mbps. This is acost-effectiveway to provide T1/E1 signals without the need for costly and complexmulti-levelmultiplexing/demultiplexing as in an M13 multiplexer. The T1/E1 signals can be directly multiplexed into the SONETSTS-1signal, allowing simplified add and drop functionality.

The MX2800 STS-1multiplexer also implements VT hairpining and VTcross-connectmapping. Any VT can be hairpinned back to theSTS-1signal for dropping further down the SONET ring.Cross-connectmapping permits a VT to be mapped to any of the 28 available physical ports.

STS-1Framing

The STS-1frame is organized as 9 rows by 90 columns of bytes. This frame is transmitted row by row, from left to right, and with the most significant bit (MSB) of each byte transmitted first. It is defined to operate at the basic rate of 8 kHz or 125 microseconds per frame, or 8,000 frames per second at a bit rate of 51.84 Mbps.

The frame is divided into two parts to physically segregate the layers. The first 3 columns make up the transport overhead (TOH); the remainder is the synchronous payload envelope (SPE). The TOH has 3 rows for the section overhead (SOH) and 6 rows for the line overhead (LOH). The SPE has one column for the path overhead (POH). The remaining 86 columns are for payload data (49.536 Mbps).

STS-1Pointers

There are several mechanisms that allow for timing compensation between the STS-1and its low speed tributaries. The MX2800STS-1multiplexer uses pointer adjustments to achieve timing

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compensation. Pointer adjustments allow the synchronous payload envelope (SPE) to float with respect to the SONET frame. The pointer is contained in the H1 and H2 bytes of the line overhead (LOH), and is a count of the number of bytes the J1 byte is away from the H3 byte, not including the transport overhead. When timing differences exist, dummy bytes are inserted into the SPE without affecting data. The receiving end can recover the payload since the pointer is adjusted to indicate where the payload overhead (POH) starts.

Transport Overhead (TOH)

The first three columns are the TOH, which contains the overhead bytes for the Section and Line layers. Section overhead is comprised of 9 bytes and Line overhead is comprised of 18 bytes.

STS-1Synchronous Payload Envelope (SPE)

The SPE has 87 columns and 9 rows of bytes for a total of 783 bytes. Column 1 contains the STS Path Overhead and has 9 bytes. The remaining 774 bytes are available for payload.

Virtual Tributaries (VT)

The SPE is divided into seven virtual tributary groups, made up of 12 columns each. Smaller tributaries are multiplexed together to form these groups. For example, there can be four VT1.5 tributaries in a VT group or three VT2 tributaries. A VT1.5 tributary consists of three columns per STS-1frame and has a bit rate of 1.728 Mbps, allowing transport of a T1 at 1.544 Mbps plus required overhead. A VT2 uses four columns perSTS-1frame and has a bit rate of 2.304 Mbps, allowing transport of an E1 at 2.048 Mbps plus required overhead.

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Unit Timing

The MX2800 STS-1multiplexer allows three timing methods. The first isLOOP timed, in which the multiplexer derives timing from the incomingSTS-1signal. A failure in this signal, such as a loss-of-signal(LOS) or aloss-of-framing(LOF) will cause the unit to enterHOLDOVER (HO) mode for the duration of the receive signal defect. DuringHO, the unit will continue transmitting at the same rate as the receive signal prior to entering its defect condition. Stability of the transmit duringHO is guaranteed to +/- 4.9 ppm over 24 hours. The defect condition must be cleared beforeLOOP time mode can be resumed.

The second mode of operation is FREE-RUNNING (FR) mode. In this mode, an internal oscillator is used to generate transmit timing.FREE-RUNNING mode provides a SONET minimum clock specification of +/- 20 ppm.

The third timing operation mode is EXTERNAL.EXTERNAL timing mode allows the MX2800STS-1to derive its transmit timing from any one of the 28DSX-1/E1physical ports. The ports selected may be data carrying ports. Two sources can be specified to provide external timing: a primary and a secondary source. Failure of the primary source (due to LOS or AIS) will cause the unit to switch to the secondary source, if available. In the event that both the primary and secondary sources are lost, the unit will enterHOLDOVER mode as described previously. Holdover mode will be exited upon recovery of at least one clock source.

SNMP

The MX2800 STS-1'sembedded SNMP feature allows the unit to be accessed and controlled by a network manager through the 10BaseT local area network (LAN) port. The MX2800STS-1

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supports the MIB-IIstandard, RFC 1213, RFC 1595, and the ADTRAN Enterprise Specific MIB.

MIB files are available at www.adtran.com.

The term SNMP broadly refers to the message protocols used to exchange information between the network management system (NMS) and the managed devices, as well as to the structure of device management databases. SNMP has three basic components, the network manager, the agent, and the MIB.

Network Manager

The network manager is a set of control programs that collect, control, and present data pertinent to the operation of the network devices. These programs reside on a network management station.

Agent

The agent is a control program that resides in every network device. This program responds to queries and commands from the network manager, returns requested information or invokes configuration changes initiated by the manager, and sends unsolicited traps to the manager.

MIB

A MIB is an industry standard presentation of all status and configuration parameters supported by a network device.

TELNET

Telnet provides a password-protected,remote login facility to the MX2800STS-1that allows a remote user to control the MX2800STS-1through the terminal menus. Only one Telnet session may be active at a time.

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TL1

Transaction Language 1 (TL1) is an ASCII based language that supports both command-responseand autonomous (NE) message generation. Commonly, TL1 is used over a X.25 packet network but is completely independent of any physical layer protocols. For the MX2800STS-1,TL1 is implemented as a Telnet session running over either Ethernet or PPP. Only one TL1 Telnet connection can be active at a time.

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AVAILABLE OPTIONS

The following optional equipment is available for use with the MX2800 STS-1.Contact your local distributor or theADTRAN sales department for more information (see front section of this manual for phone number).

Breakout Panel (P/N 1200291L1)

The optional breakout panel connects to the MX2800 STS-1and provides 28 RJ connectors for the individual T1s/E1s. Shipment includes twosix-foot,64-pinto64-pinAmp cables which allow direct cabling to the MX2800STS-1(seeConnecting the Breakout Panel on page 2-6 for more information).

Battery Backup (P/N 4175043L2)

The battery backup system provides power backup in the event of power loss. This system includes the battery, an AC battery charger, and an alarm cable.

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