Jitter Attenuator And Lobe Extender

Transcript

TJA Jitter Attenuator and Lobe Extender Publication Number: 591-204-04/96 RADring Modules - TJA TJA - Jitter Attenuator and Lobe Distance Extender Description The TJA is a Jitter Attenuator and Lobe Distance Extender module for the RADring hub, which provides improved operation of the Token Ring network and extended distances on the lobes. The TJA placed in any slot of the RADring hub receives the IEEE 802.5 signal on the main path of the backplane of the hub, and using a unique jitter reduction and repeater circuit, regenerates a clean jitter free signal in the direction of the next inserted station on the ring. T JA PW R MNG When operating in conjunction with repeater modules TCR (UTP/STP) or TFR (fiber optics) the use of the TJA enables guaranteed extended distances on the lobes, irrespective of the configuration of the rest of the ring. This accommodates easy planning and calculation of the network. FLT JITTE R ATTE N. Operation in conjunction with extended distance lobe access modules TL-2/ED (UTP/STP), TL-4/CX (coax) or TL-2/F (fiber optic) provides a lobe repeater function for connection of remote workstations or satellite access units and hubs. The jitter attenuation function can be enabled by means of an internal switch or by management command from the RADnet management station. In addition 4 or 16 Mbps operation can be defined manually by a switch or by the management. The TJA can also be bypassed by means of a management command. Front panel LEDs provide indication of management intervention, fault condition, jitter attenuation activity and 4 or 16 Mbps operation. TJA TJA Front Panel Indicators Indicator Function PWR Power on (green). Lights when the TJA module receives power. MNG Module under network management control (green). Lights when bypass command is being forced by the management station. FLT ON when signal fault condition exists (red). ON Lights when jitter attenuator is enabled (green). OFF Lights when jitter attenuator is disabled (green). 4 Lights when module selected to operate at 4 Mbps (green). 16 Lights when module selected to operate at 16 Mbps (green). RADring Installation and Operation Manual 1 RADring Modules - TJA Specifications Transmission Range For IBM type 1 (STP) cable: 750 m / 2500 feet at 4 Mbps 300 m / 1250 feet at 16 Mbps 350 m / 1100 feet at 4 Mbps 150 m / 550 feet at 16 Mbps For IBM type 3 (UTP) cable: Jitter Attenuation Curves 4 Mbps 16 Mbps 0 0 1 UI 1 UI -4 2 UI -6 5.5 UI -8 4 UI 3 UI -10 -12 JITTER ATTENUATION (DB) JITTER ATTENUATION (DB) -2 5 UI -5 10 UI 30 UI -10 15 UI -15 -14 -16 0 100 200 300 -20 400 0 FREQUENCY (HZ) 100 200 300 400 FREQUENCY (HZ) Data Rate 4 or 16 Mbps, switch selectable Data Format Balanced bipolar Differential Manchester encoded Output Level 4 V (on 150 ohms) Physical Occupies one slot in RADring enclosure Height: 128 mm / 5.04 in Width: 20 mm / 0.8 in Depth: 170 mm / 6.69 in Weight: 154 g / 5.5 oz Power Consumption 550 mA (max) at 5 VDC Environment Temperature: 0-50°C / 32-122°F Humidity: Up to 90%, non-condensing 2 RADring Installation and Operation Manual RADring Modules - TJA Set-Up TJA modules occupy one slot of the RADring enclosure. The modules can be installed or removed while power is applied to the enclosure. 1) Set the TJA switches according to the table below for the required application. 2) Plug the module into the designated enclosure slot, as marked on the site installation plan. Fasten module by means of one screw. Do not overtighten. 16m JA M NG 4m OFF ON 3) Check that on each TJA module LEDs light according to the set-up. TJA Strapping Diagram TJA Jumper/Switch Settings Strap Identity Function Possible Settings Factory Setting MNG Controls jitter attenuation by the management system ON or OFF OFF JA Jitter Attenuator On/Off ON or OFF ON 4m/16m Operating data rate 4 Mbps or 16 Mbps 16 Mbps RADring Installation and Operation Manual 3 RADring Modules - TJA Application STP (300 m) TCR TJA RADring TCR RAD ring UTP or STP or FIBER or COAX LOBE R E P E AT E R TCR TJA RAD ring TL-2/ED TJA TCR RAD ring RAD ring UTP (150 m) RADring STP (375 m) Typical Application for TJA See Chapter 6 for detailed information on network configuration with TJA. 4 RADring Installation and Operation Manual