Performance Monitoring Trunks Application Sheet ISSUE June 1

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Performance Monitoring Trunks Application Sheet ISSUE June 1

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MSAS-69
Performance Monitoring Trunks Application Sheet
ISSUE
June 1995
Introduction
equipment rather than external CSU, which provides following benefits: Local Carrier interface cost which will result substantial cost savings user, customer have access performance data maintenance functions.
following paragraphs describe trunk interface that meets requirements ANSI recommendation T1.403 using Mitel components cost Channel Service Unit (CSU) Office Repeater (OR). This design establishes performance monitoring maintenance functions customer's
From other interfaces
other interfaces
C8Kb 16.384 Osc.
12.352 Osc. other
other Interfaces
TRANSMIT
MT8941
MT8980
To/From Other Interfaces
MH89761
RCLT RCHT RCLR RCHR
Interfaces
STi2 STo3
MT8926
STo0 STo1 STi0 STo2 STi1 E8Ko CSTo DSTi0 DSTi1 1SEC FDLi EClk CSTi1 E8Ki CSTi0 FDLo DSTo
MH89760B
C1.5i OUTA +12V E1.5o :0.5 CSTi1 E8Ko CSTo OUTB TxFDL DSTi CSTi0 DSTo RxFDLClk RxFDL TxFDLClk
STo7 STi7
INT0 INT1
MT8952
CDSTo
RECEIVE
TxCEN RxCEN CDSTi
R1=150, 1/4w 4.7K =4.7K 0.01µF, 250V 0.47µF, 100V 33µH, 130mA 33µH, 165mA
Performance Monitoring Message/Data Storage
T1.403 Message-Oriented Signal Control
Figure T1.403 Trunk Interface Implementation
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MSAS-69
T1.403 Requirements
Application Sheet
Performance Reporting
ANSI specification T1.403 entitled "Carrier-toCustomer Installation Metallic Interface", states physical layer, maintenance, performance monitoring reporting requirements customer premises interface. following sub-sections briefly outline these requirements. Physical Layer Requirements
ANSI T1.403 defines mode Facility Data Link (FDL), which used transport performance information control signals across link. channel formed from framing position every second frame, therefore, Kbps bandwidth. basic message formats have been defined data information transport across FDL. These Message-oriented performance reports (LAPD) Bit-oriented messages (repeated codewords). LAPD message-oriented performance reports sent across once second using bit-assigned message structure described T1.403. Every report contains performance data each second previous four seconds. Bit-oriented messages (BOMs) preempt message-oriented reports, consist codewords form 11111111 0XXXXXX0. This provides maximum unique codewords messages defined XXXXXX. Refer T1.403 list messages message restrictions. BOMs further divided into priority messages, command response messages. Priority messages indicate existence serviceaffecting failure, repeated until condition that initiated message removed. These BOMs transmitted least second, interrupted often once second, maximum msec. This accommodate periodic transmission message-oriented performance reports. Command response messages used perform line payload loopbacks, protection switching, synchronization control, well other network functions. Each message consists codeword form 11111111 0XXXXXX0, which repeated least times. User defined Operations, Administration Maintenance (OA&M), terminal-to-network terminal-to-terminal communications also pass over FDL.
T1.403 supplements physical layer requirements ANSI T1.102 include following: framing requirements (CRC-6 Facility Data Link (FDL)). Electrical, jitter connector requirements. Typical interface cable characteristics. Maintenance Requirements following maintenance
T1.403 includes requirements:
Yellow alarm operation. Blue alarm operation. Loss Signal indication. line loopback activate deactivate code functions, well line payload loopback operation. Performance Monitoring
following transmission-error events recorded T1.403: CRC-6 error event. Occurs when locally generated CRC-6 remainder does match CRC-6 remainder received from end. Severely errored framing event. Occurs when more framing errors appear during msec. period. Frame-synchronization-bit error event. Occurs when framing received error. Line-code violation event (BPVs). Occurs when received line code does match selected B8ZS line encoding format. Controlled slips. Occurs when there replication deletion frame received interface.
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Application Sheet
Circuit Realization
MSAS-69
Supports bit-oriented message-oriented data transfer over Facility Data Link (FDL). Framing Error, Severely Errored Farming Event, Error, Bipolar Violation Error Counters. Alarm interrupts counter overflow interrupts. Circuit Description
Figure illustrates implementation T1.403 interface. MH89760B provides framer line interface unit functions (see also MH89761 Transmit Equalizer data sheet). MT8926 PMAC supplements MH89760B providing required performance monitoring maintenance functions. This accomplished connecting PMAC RxA, extracted clock (E1.5o) MH89760B, which allows receive messages analyse received signal. Both devices ST-BUS compatible same control streams. That PMAC programmed through unused channels MH89760B's CSTi1 stream, will insert data into MH89760B's CSTo stream. MT8926 PMAC data sheet more details. MT8941 dual DPLL that synchronizes 2.048 transmit clock (C2i) 1.544 extracted network clock (E1.5o). MT8952 HDLC device used transmit receive performance messages across kbps FDL. MT8980 used message mode interface microprocessor control status bytes ST-BUS format. also used switch individual channels DSTi DSTo streams. MH89760B Interface
Loss Signal (LOS) indication function exists both MT8926 MH89760B. MH89760B physical output been wired status input (XSt) Figure PMAC indicates condition bringing high master status word one. DSTo MH89760B passes through MT8926 allow implementation payload loopback. PMAC will also decode transmit line loopback activation deactivation codes. line loopback implemented activating MH89760B remote loopback. PMAC Bit-oriented Message registers (BOMs) that allow transmit receive (decode) bit-oriented messages. When message decoded valid message indication provided microprocessor ST-BUS MT8980. Transmit message-oriented communication supported muxing data source from PMAC register FDLi input, which connects CDSTo MT8952 HDLC controller Figure section explanation performance reporting messages. RxFDL output MH89760B connected CDSTi MT8952 support reception LAPD message-oriented signals. MT8952 will identify message-oriented signal opening closing flags (01111110) message. Therefore, this sequence should used bit-oriented message (0XXXXXX0). MT8952 will recognize 11111111 bit-oriented message preamble abort signal, these messages preempt message-oriented signals. MT8952 interrupts generated using clock input. Therefore, glue circuitry been added MH89760B MT8952 interface, which allows MT8952 input clocked (2.048 MHz) instead RxFDLCLK kHz). MH89760B extracted clock (E8Ko) used PMAC (E8Ki) align device received signal. network timing source selected
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MH89760B upgraded pin-for-pin compatible version MH89760 bidirectional interface, which includes line interface unit, framer slip buffer. MH89760B enhancements inductorless receive clock recovery, internal generation Loss Signal Indication (LOS). MT8926 Performance Monitoring Adjunct Circuit (PMAC)
MT8926 PMAC adjunct MH89760B that collects reports performance data specified T1.403. This device following features: (D3/D4), modes operation. second timers T1.403 message transmission. Yellow Alarms, Alarm Indication Signal (AIS), Loss Signal Indication (LOS). Payload Loopback, Line Loopback code generation detection (integration).
MSAS-69
through PMAC E8Ko rather than MH89760B E8Ko. PMAC signals 1SEC implemented microprocessor interrupt sources. will pulled PMAC when exception condition counter overflow occurs. 1SEC interrupt used signal microprocessor transmit periodic message-oriented LAPD packet network. Microprocessor block Figure controls ST-BUS devices through MT8980 message mode. MT8952 controlled microprocessor address/control/data bus.
Application Sheet
Software Requirements
T1.403 interface Figure will require implementation following software functions: basic device drivers MH89760B/ MT8926, MT8980 MT8952. Performance monitoring software that will read performance data from PMAC store T1.403 message-oriented signal format. interrupt service routine that will initiate transmission current message-oriented packet. Bit-oriented message control response software. Control software that allows interworking message-oriented bit-oriented signals.
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Performance Monitoring Trunks Application Sheet ISSUE June 1

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