Оценок - 4, средний балл: 3.8
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Фрагмент инструкции
Channel Select Closed ............. Alternate Open ............... Contiguous Description Selects between alternating and contiguous DS0 channels. SW1-2 ............. Auto Code Detect Closed ............. Auto Open ............... Manual SW1-3 ............. Manual Code Select Closed ............. AMI Open ............... B8ZS When this switch is closed, the unit automatically detects the line code as B8ZS or AMI. When SW1-2 is open, SW1-3 open selects B8ZS line code, while SW1-3 closed selects AMI. SW1-4 ............. Auto Frame Detect Closed ............. Auto Open ............... Manual SW1-5 ............. Framing Closed ............. Superframe Format (SF) Open ............... Extended Superframe FormatWhen this switch is closed, Auto Frame Mode detection is enabled and the unit selects between SF and ESF modes automatically. When open, SW1-5 manually selects the framing mode. When SW1-4 is open, SW1-5 closed selects SF. SW1-5 open selects ESF. (ESF) SW1-6 ............. Latching Loopback Closed ............. Enabled Open ............... Disabled SW1-7 ............. Loopback Timeout Closed ............. 20 Minutes Open ............... None This switch is used to enable or disable latching loopbacks. SW1-7 is used to enable or disable automatic loopback timeout. SW1-8 ............. Loopback Keep Alive Closed ............. AIS Open ............... All 1s, framed SW2-8, 2-7...... DS1 Transmit Level Open, Open .... 0 dB Open, Closed .. -7.5 dB Closed, Open .. -15 dB Closed, Closed -22.5 dB SW3-1 ............. Idle Code Detect Closed ............. Auto Open ............... Manual SW 3-2 ............ Idle Code Closed ............. FF Open ............... 7F Sets the data pattern sent to the customer upon FNID network loopback. The DS1 signal level delivered to the customer through the FNID may be selected as one of four values: 0, -7.5, -15, or -22.5 dB. When SW3-1 is closed, auto idle code detection is enabled and the unit selects between 7F (Hex) and FF (Hex). When SW3-1 is open and SW3-2 is closed, selects FF (Hex). When SW3-2 is open, selects 7F (Hex). SW4-1-SW4-8 Channels 1-8 A/B Signaling This switch enables or disables A/B signaling for Channel 1-8 of the selected FT1 Closed ............. Enabled channels. Open ............... Disabled SW5-1-SW5-5 Channels 9-12 A/B Signaling This switch enables or disables A/B signaling for Channels 9-12 of the selected FT1 Closed ............. Enabled channels. Open ............... Disabled FNID SW1, SW2 POWER LOCAL SPAN SW1 DS1 SEALING CURRENT SW2 20MA 60MA OFF ON 20 mA sealing current selectIndicates default setting Sealing current disabled 20 mA, 60 mA Sealing current enabled Off, On Powered Powered by -48 by span VDC current 61242.047L2-13A FT1-DP FT1-Repeater FNID Channel Bank Backplane Central Office Customer Premises 2B1Q 12 kft 24-AWG 9 kft 26-AWG (max.) Loop 1 Loop 15 6 3 4 DS1 7 13 5 15 55 49 2B1Q 12 kft 24-AWG 9 kft 26-AWG (max.) WORKING LENGTH OF 24 GAUGE (OR COARSER) CABLE (KFT) 12 11 10 9 8 7 6 5 4 3 2 1 0 0123456789 WORKING LENGTH OF 26 GAUGE CABLE (KFT) HDSL Loss Values (200 kHz cable loss in dB/kft at 135W) 2.5 INVALID HDSL CABLE LENGTHS 2.0 1.5 1.0 0.5 0.0 TOTAL BRIDGED TAP LENGTH (KFT) VALID HDSL CABLE LENGTHS Cable Cable Temperature: Gauge Type 68° 90° 120° 26 PIC 3.902 4.051 4.253 26 Pulp 4.030 4.179 4.381 24 PIC 2.863 2.957 3.083 24 Pulp 3.159 3.257 3.391 22 PIC 2.198 2.255 2.333 22 Pulp 2.483 2.45 2.629 19 PIC 1.551 1.587 1.634 19 Pulp 1.817 1.856 1.909 Loop Insertion Loss Data Frequency (Hz) Maximum Loss (dB) 3,000 12.0 10,000 15.0 50,000 25.5 100,000 30.0 150,000 32.75 200,000 35.25 These approximations are to be used as guidelines only and may vary slightly on different loops.Adhering to these guidelines should produce performance in excess of 10-7BER. ADTRAN Customer Service: ADTRAN Telco Technical Support ............... (800) 726-8663 Standard support hours ................................ Monday-Friday 7 a.m. - 7 p.m. CST Emergency support ................... 7 days/week, 24 hours/day Sales ............................................................. (800) 827-0807 RMA (repair service).................................... (205) 963-8722 Repair and Return Address: ADTRAN, Inc. Customer Service Department 901 Explorer Boulevard Huntsville, Alabama 35806-2807 Section 61242.047L2-13, Issue 1 61242.047L2-13A ...