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The Main Menu options are briefly described below. 3.2.2 System Configuration System Configuration options allow you to change various The default System Configuration menu looks like this: a aspects of the NetLink-T1™’s operation, e.g., framing, line coding, and aggregate bandwidth. System Diagnostics/Statistics options allow you to monitor b the network performance, initiate V.54 loops, local loops, and send test patterns. Network performance parameters are updated once a second, giving you t
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ESF: This stands for Extended Superframe Format, a line format B8ZS: Bipolar violations occur when consecutive pulses are of developed by AT&T. AT&T Technical Reference 54016 (TR the same polarity. In B8ZS, or Bipolar Eight Zero Substitution, 54016) defines the ESF, a format which is commonly used to bipolar violations are introduced deliberately to indicate that allow monitoring of the network interface performance over eight zeros have been transmitted. This special encoding is the Facility Da
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d f Clocking: Network (default) ESF Data Link: ANSI T1.403 Options: Network, Internal, External Options: ANSI T1.403, AT&T TR54016 Network: This is the most commonly used setting when connect ANSI T1.403: This ANSI developed standard (see ANSI T1.403- ing to a carrier’s network. In this mode, the unit recovers the 1995: Network-to-Customer Installation—DS1 Metallic clock from the received signal and uses it to transmit data. In Interface) uses the FDL to send and receive one second this way t
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n h Remote In-band Loops: Enabled (default) DS0 Channel Configuration Menu [ Bandwidth/# Channels = 1,536/24 ] (default) Options: Enabled, Disabled The DS0 Channel Configuration Menu has a sub-menu that looks In ESF, D4 and Unframed formats, the unit can respond to special like this: 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. This pattern overwrites the normal data. When this code is det
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3.2.3 System Diagnostics Remote Loop Idle (default) b The System Diagnostics/Statistics screen looks like this: The Remote Digital Loopback (RDL) test checks the performance of both the local and remote NetLink-T1™s, as well as the communica- tion link between them. Data from the local DTE is sent across the entire communication circuit and looped back to the local DTE. The NetLink-T1™ Initiating a RL can be in one of the following states: OK Idle No user-controlled loopbacks are active.
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The NetLink-T1™ receiving a RL can be in one of the following states: NI STATUS RxPr The NetLink-T1™ is receiving a preparatory pattern. The Network interface (NI) status is shown in the middle of the Diagnostics/Statistics Sack The NetLink-T1™, upon receiving a preparatory pattern, screen. The brackets are empty when the link sends an acknowledgement message. is operating normally. In this example, various two or three-letter messages are displayed RL The NetLink-T1™ is in remote loopback mode
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3.2.4 Unit Options c Loop Timeout The Unit Options screen looks like this (factory default): The Loop Timeout setting can be set to one of the following: 00:05 = five minutes 00:10 = ten minutes 00:15 = fifteen minutes 00:30 = thirty minutes (default setting) 00:45 = forty-five minutes 01:00 = one hour 01:30 = 90 minutes 02:00 = two hours 03:00 = three hours NEVER = forever—the unit will remain in loopback without user intervention. d Set to Default Configuration You may set the NetLink-T1™ to
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4.0 INSTALLATION 4.3 POWER CONNECTION The NetLink-T1™ is equipped with DTE, network, and power interfaces. This section briefly describes connection to each. The NetLink-T1™ offers three ways to supply external power: AC power, DC power and interface power. 4.1 DTE INTERFACE CONNECTION 4.3.1 Using the AC Power Supply (120VAC or 100-240VAC) The DTE interface is a V.35 DCE presented as an M/34 male con- nector. This interface is designed to plug directly into a DTE interface The NetLink
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Model 2711 5.0 OPERATION Once the NetLink-T1™ is installed and configured properly it is LOS The Loss of Sync LED lights when the unit ready to place into operation. This section describes the function of loses synchronization with the incoming sig- the LED indicators, and the use of the loopback and pattern test nal. This may happen when there is a fram- modes. ing mismatch or a loss of signal. In unframed mode, the LOS LED monitors the 5.1 LED DESCRIPTIONS status of the transmit clock. The
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To perform an RDL test, follow these steps: 5.2 LOOP (V.54 & TELCO) DIAGNOSTICS 1. Activate RDL. This may be done in two ways: The NetLink-T1™ offers three V.54 loop diagnostics and is com- patible with two Telco loop diagnostics. Use these diagnostics to test b a. Enter Remote Loop from the System the CSU/DSU and any communication links. These tests can be acti- Diagnostics/Statistics menu and toggle the vated via the software control port (See Section 3.2.3 System b u
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APPENDIX A 5.3 BIT ERROR RATE (V.52) DIAGNOSTICS PATTON NETLINK-T1 MODEL 2710 The NetLink-T1™ offers three V.52 Bit Error Rate (BER) test pat- SPECIFICATIONS terns. These test patterns may be invoked along with the LAL and RDL tests to evaluate the unit(s) and the communication links. WAN Speed: 1.544 Mbps When a 511, 2047, or QRSS test is invoked, the NetLink-T1™ 20 WAN Connection: RJ-48C generates a pseudo-random bit pattern of 511 bits, 2047 bits or 2 bits, respectively, using a mathe
