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USER
MANUAL
MODEL 2701/B, C, D
G.703/G.704 NTU with
EIA-530, V.35, X.21
Interfaces
Part# 07M2701/X SALES OFFICE
Doc# 086101U Rev. B
(301) 975-1000
Revised 1/6/05
TECHNICAL SUPPORT
(301) 975-1007
An ISO-9001Certified
Company
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CONTENTS 1.0 Warranty Information ................................................................. 4 1.1 Radio and TV Interference............................................................ 4 1.2 CE Notice...................................................................................... 4 1.3 Service.......................................................................................... 5 2.0 General Information...............................................................
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A.5 Line Framing ............................................................................... 21 A.6 CRC-4 Multiframing .................................................................... 21 A.7 Clocking ...................................................................................... 21 A.8 Time Slot Rate ............................................................................. 21 A.9 Network Data Rates .................................................................... 21 A.1
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1.0 WARRANTY INFORMATION Patton Electronics warrants all Model 2701/I components to be free from defects, and will—at our option—repair or replace the product should it fail within one year from the first date of shipment. This warranty is limited to defects in workmanship or materials, and does not cover customer damage, abuse, or unauthorized modification. If this product fails or does not perform as warranted, your sole recourse shall be repair or replacement as described above. U
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1.3 SERVICE All warranty and non-warranty repairs must be returned freight prepaid and insured to Patton Electronics. All returns must have a Return Materi- als Authorization number on the outside of the shipping container. This number may be obtained from Patton Electronics Technical Services at: • Tel: +1 (301) 975-1007 • Email: support@patton.com • URL: http://www.patton.com Note Packages received without an RMA number will not be accepted. 5
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2.0 GENERAL INFORMATION Thank you for your purchase of this Patton Electronics product. This product has been thoroughly inspected and tested and is warranted for One Year parts and labor. If any questions or problems arise during installation or use of this product, please do not hesitate to contact Pat- ton Electronics Technical Support at (301) 975-1007. 2.1 FEATURES • Terminates G.703 and G.704, E1/fractional E1 service • Available in low-cost standalone or rack-mountable versio
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3.0 CONFIGURATION The Model 2701 features configuration capability via hardware DIP switches. This section describes all possible DIP switch configurations of the Model 2701. 3.1 DIP SWITCH CONFIGURATION The Model 2701 has two sets of internal DIP switches that allow configu- ration for a wide range of applications. The sets of switches are accessed from the underside of the 2701. Figure 1 shows the location of the DIP switches on the bottom of the printed circuit board. Figure 1.
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Switch SW1-1 through SW1-5 A detailed description of each switch (SW1-1 through SW1-5) setting fol- lows the summary table below. Table 1: Switch Set 1 Summary Table SW1 SW2 SW3 SW4 SW5 Speed On On On On On 64 kbps Off On On On On 128 kbps On Off On On On 192 kbps Off Off On On On 256 kbps On On Off On On 320 kbps Off On Off On On 384 kbps On Off Off On On 448 kbps Off Off Off On On 512 kbps On On On Off On 576 kbps Off On On Off On 640 kbps On Off On Off On 704 kbps Off Off On Off On 7
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SW1 SW2 SW3 SW4 SW5 Speed On On Off On Off 1344 kbps Off On Off On Off 1408 kbps On Off Off On Off 1472 kbps Off Off Off On Off 1536 kbps On On On Off Off 1600 kbps Off On On Off Off 1664 kbps On Off On Off Off 1728 kbps Off Off On Off Off 1792 kbps On On Off Off Off 1856 kbps Off On Off Off Off 1920 kbps On Off Off Off Off 1984 kbps Off Off Off Off Off Clear Channel 2048 kbps Note When the data rate is set to 2.048Mb/s, the unit is forced into G.703 mode, and it transmits user
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SW1-8: Enable/Disable Loop Tests from DTE Use Switch SW1-8 to allow Model 2701 to enter loopback tests when the DTE raises the appropriate loop request pin. S1-8 Setting Off Response to DTE Loopback Request Enabled On Response to DTE Loopback Request Disabled Position Function Factory Default Selected Option SW2-1 Line Coding Off HDB3 SW2-2 CRC-4 multiframe Off Disabled SW2-3 Data Inversion Off Data Not Inverted SW2-4 V.54/CSU select Off V.54 RDL loop SW2-5 FPS enabled Off Enabl
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Every other pulse is inverted from the previous pulse in polarity, so that the signal can be effectively transmitted. This means, however, that a long sequence of zeros in the data stream will cause problems, since the NTU receiving the signal relies on the signal to recover the 2.048 Mb/s clock. If you must use AMI, you should ensure that the data terminal equipment connected to the unit provides a minimally accept- able pulse density. For this reason, there are advantages to
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Switch SW2-4: Remote Digital Loopback Type The user can set this switch to select the type of remote loop that will be initiated by the Model 2701. If set to V.54, the Model 2701 will initiate a V.54 loop when Remote Loop is selected by the front panel switches. If set to CSU, the Model 2701 will initiate a CSU loop when Remote Loop is selected by the front panel switches. S2-4 RDL Type Off Initiate a V.54 RDL loop when selected On Initiate a CSU loopback when selected Switch
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4.0 INSTALLATION Once the Model 2701 is properly configured, it is ready to connect to the G.703/G.704 interface, to the serial port, and to the power source. This section describes how to make these connections. 4.1 CONNECTING TO THE G.703 NETWORK The Power, G.703/G.704 and serial Line connections are located on the rear panel of the Model 2701. The following sections describe operation of these connections. Connecting the 2701/D (X.21 version) Dual Coaxial Cable (75 oh
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(Figure 4) following the pinout and signals chart below to connect the 120 ohm G.703/G.704 network channel. Figure 4. G.703/G.704 170 ohm Connection. 4.2 CONNECTING THE SERIAL PORT The Model 2701/B, C, D supports RS-530, V.35, X.21 serial port connec- tions. This section describes how to connect the serial ports to your ter- minal equipment. Connecting to a “DTE” Device The serial port on the 2701/B (RS-530 version) and 2701/C (V.35 ver- sion) is hard-wired as a DCE. Therefore these
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Connecting to a “DCE” Device If the Model 2701 serial interface is hard-wired as a DCE (all except the X.21 version), you must use a null modem cable when connecting to a modem, multiplexer or other DCE device. This cable should be of the shortest possible length—we recommend 6 feet or less. Configuring the X.21 Interface (2701/D) The serial port on the X.21 interface is default wired as a DCE, but may be switched to a DTE. This is done by reversing the orientation of the DCE/DTE
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DC Power The 36–60 VDC DC to DC adapter supplied with the DC version of the Model 2701 plugs in a DC source (nominal 48 VDC) and plugs into the barrel power supply jack on the rear of the 2701. Refer to Figure 5 to make the proper connection. Figure 5. Connecting DC Power to the 2701 DC Power Supply. There are no user-serviceable parts in the power supply section of the Model 2701. Con- tact Patton Electronics Technical support at (301)975-1007, via our web site at http:// www.patto
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5.0 OPERATION When the Model 2701 has been properly configured and installed, it should operate transparently. This sections describes power-up, LED status monitors, and the built-in loopback test modes. 5.1 POWER-UP Before applying power to the Model 2701, please read “Power Connec- tion” on page 15 and verify that the unit is properly connected to the appropriate power source. 5.2 LED STATUS MONITORS The Model 2701 features six front panel LEDs that monitor connections
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the identical pattern. When it receives the correct pattern, the LED will turn off. If error insertion is on, the LED will blink once a second if everything is operating properly. TM (Active Yellow) Solid Yellow indicates an Active Test Mode. The unit may be placed in test mode by the local user or by the remote user. 5.3 LOOP (V.54 & TELCO) DIAGNOSTICS The Model 2701 offers three V.54 loop diagnostics. Use these diagnos- tics to test the NTU and any communication links. These t
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2. Verify that the data terminal equipment is operating properly and can be used for a test. 3. Perform a V.52 BER (bit error rate) test as described in section “Using the V.52 (BER) Test Pattern Generator” on page 20. If the BER test equipment indicates no faults, but the data terminal indi- cates a fault, follow the manufacturer’s checkout procedures for the data terminal. Also, check the interface cable between the terminal and the Model 2701. Operating Remote Digital Loop
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— Set the front panel switch to “Remote”. 2. Perform a bit error rate test (BERT) using the internal V.52 genera- tor (as described in section “Using the V.52 (BER) Test Pattern Generator”), or using a separate BER Tester. If the BER test indi- cates a fault, and the Local Line Loopback test was successful for both NetLink devices, you may have a problem with the twisted pair line connection. CSU Loop Although CSU Loop is predominantly a T1 function, the NetLink-2701 responds to
