Benutzeranleitung / Produktwartung 2720 des Produzenten Patton electronic
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USER MANU AL MODEL 2720/I T1/Fractional T1 CSU/DSU with Ethernet Bridging SALES OFFICE (301) 975-1000 TECHNICAL SUPPOR T (301) 975-1007 http://www .patton.
1 2 T ABLE OF CONTENTS Section P age 1.0 W arranty Information .............................................................2 1.1 W arranty Statement 1.2 Radio and TV Interference 1.3 Equipment Attachment Limitations 1.4 FCC Compliance 1.5 Service Information 2.
4 3 1.3 INDUSTR Y CANAD A NO TICE The Canadian Depar tment of Communications label identifies cer- tified equipment. This cer tification means that the equipment meets cer tain telecommunications network protective , operational and saf ety requirements.
5 6 2.0 GENERAL INFORMA TION Thank you for your purchase of this Patton Electronics product. This product has been thoroughly inspected and tested and is warrant- ed for One Y ear parts and labor . If any questions arise during installa- tion or use of the unit, contact Patton Electronics T echnical Services at (301) 975-1007.
7 3.0 PPP Operational Bac kg round PPP is a protocol used for multi-plexed transport over a point- to-point link. PPP operates on all full duplex media, and is a sym- metric peer-to-peer protocol, which can be broken into three main components: 1. A standard method to encapsulate datagrams over serial links; 2.
Line Framing Options: D4/Superframe : The D4 framing format, as specified in A T&T TR6241 1 is the standard in which twelve frames make up a superframe. All signaling and synchronization are done in- band. Extended Superframe (ESF) : Extended Superframe, as speci- fied in A T&T TR 54016, consists of twenty-four (24) T1 frames.
11 12 Switch S2-6 and S2-7: Cloc k Mode Set Switch S2-6 and S2-7 to determine the 2720’s transmitter tim- ing. S2-6 S2-7 Clock Mode Off Of f Network Cloc k . T ransmitter timing is derived from the received line signal. On Off Internal Clock . T ransmitter clock is derived from an internal oscillator .
13 14 Switch S1-3: Tx Clock Inv er t Switch S1-3 allows the user to in ver t the transmit clock originating in the 2720. When S1-2 is set for tr ansmit clock, it may be necessary to inv er t the transmit clock to allow f or delays due to long cab les.
15 16 4) When the unit is first turned on, the ter minal screen may appear blank. Press the [Enter] key . If y our ser ial connection is good, the unit will immediately displa y a pass word prompt. The f ollowing message will appear in the middle of the screen: 5) T ype in the password and press [Enter].
17 18 The Main Menu options are briefly described below . System Configuration options allow you to change v ar ious aspects of the Model 2720’ s operation, e.g., framing, line cod- ing, and aggregate bandwidth. System Diagnostics/Statistics options allow you to monitor the network performance, initiate V .
19 20 B8ZS: Bipolar violations occur when consecutive pulses are of the same polarity . In B8ZS , or Bipolar Eight Zero Substitution, bipolar violations are introduced deliberately to indicate that eight zeros ha ve been transmitted. This special encoding is recognized b y the receiver and decoded correctly .
21 22 Clocking : Network (def ault) Options: Network, Internal, External Network: This is the most commonly used setting when connect ing to a carrier’ s networ k. In this mode, the unit recov ers the clock from the receiv ed signal and uses it to transmit data.
23 24 Remote In-band Loops : Enabled (def ault) Options: Enabled, Disabled In ESF , D4 and Unframed formats, the unit can respond to special repeating codes in the data stream that represent loopback com- mands. The command to loop up (go into loopback) is a repeating pat- tern of 00001s.
25 26 3.2.3 System Diagnostics The System Diagnostics/Statistics screen looks like this: NO TE: This screen is updated once per second. The System Diagnostics/Statistics options and functions are described below .
27 28 RxPr The Model 2720 is receiving a preparatory pattern. Sack The Model 2720, upon receiving a preparatory pattern, sends an acknowledgement message. RL The Model 2720 is in remote loopback mode. RxT r The Model 2720 is receiving a terminate loopback mes- sage.
29 30 Receive Alarm Indication [RAI] indicates that the local unit is receiv- ing a Y ellow Alarm. This alarm is sent by the remote unit or the central office when it loses the received signal. This indicates the local unit’ s transmitted signal is not reaching the remote unit.
31 32 3.3.6 Unit Information The Unit Options screen looks like this (factory default): Header Line 1 & Header Line 2 Headers 1 and 2 are provided for easy identification of your unit after installation. Y ou may want to give each unit a unique name via the header lines to help distinguish one unit from another .
33 34 4 4 . . 0 0 I I N N S S T T A A L L L L A A T T I I O O N N The Model 2720 is equipped with DTE, network, and power inter- f aces. This section briefly describes connection to each. 4.1 Connecting the 10Base-T Ethernet Port to a PC (DTE) The 10Base-T Interface is configured as DTE (Data T erminal Equipment).
35 36 5 5 . . 0 0 O O P P E E R R A A T T I I O O N N Once the NetLink-T1™ is installed and configured properly it is ready to place into operation. This section describes the function of the LED indicators, and the use of the loopback and pattern test modes.
5.2 LOOP (V .54 & TELCO) DIAGNOSTICS The NetLink-T1™ offers three V .54 loop diagnostics and is com- patible with two T elco loop diagnostics. Use these diagnostics to test the CSU/DSU and any communication links. These tests can be acti- vated via the software control port (See Section 3.
40 39 2. Perform a bit error rate test (BERT) using the internal V .52 generator (as described in Section 5.3 ), or using a separate BER T ester . If the BER test indicates a fault, and the Local Line Loopback test was successful for both NetLink™s, you may have a problem with the twisted pair line connection.
42 APPENDIX A P A TTON NETLINK-T1 MODEL 2720 SPECIFICA TIONS W AN Speed: 1.544 Mbps W AN Connection: RJ-48C Nominal Impedance: 100 Ohms DTE Interface: 10Base-T Ethernet (802.3) Line Coding: AMI/B8ZS Line Framing D4/ESF/Unframed Receive LBO: Automatic T ransmit LBO: Selectable - 0, 7.
43 44 APPENDIX C P A TTON NETLINK-T1™ MODEL 2720 F ACT OR Y REPLACEMENT P ARTS AND A CCESSORIES Patton Model # Description 10 - 09F ............................6 Foot Control Port Cable, 2.5mm to DB9F 07M2720/I........................User Manual 2720/C/UI.
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