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RDS+
RDS+:
Router Delay Simulator
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Description:
The Router Delay Simulator Plus (RDS+) allows users to test/stage critical DCE or DTE equipment for reliable network operation while simulating network delay times. The RDS+ provides a realistic simulation of physical network behavior with respect to time delays and bit errors. It supports user circuit rates up to OC-1 (51.84 Mbps) while providing delays from zero to a maximum of 8 seconds round trip. Both continuous random and burst errors are supported. |
- Ordering Info
- Description
- Features
- Specs
- Overview
Part #: 175000
Model: RDS-PLUS, Base Unit
Description: Router Delay Simulator - Plus |
Part #: 175030
Model: RDS-PLUS, GUI
Description: Web enabled GUI interface
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Interfaces Available:
| Part # |
Product Name |
TTL To Digital Interface Modules
|
| 129014 |
RS-232 DCE I/M |
RS-232, DB-25 Female, DCE Interface Module(connects to DTE) |
| 129032 |
RS-232 DTE I/M |
RS-232, DB25 Male, DTE Interface Module(connects to DCE) |
| 129010 |
V.35 DCE I/M |
V.35, MR-34 Pin Female, DCE Interface Module(connects to DTE) |
| 129028 |
V.35 DTE I/M |
V.35, MR-34Pin Male, DTE Interface Module(connects to DCE) |
| 129011 |
RS-530 DCE I/M |
RS-530, DB-25 Female, DCE Interface Module(connects to DTE) |
| 129029 |
RS-530 DTE I/M |
RS-530, DB-25 Male, DTE Interface Module(connects to DCE) |
| 129012 |
RS-422 DCE I/M |
RS-422/449, DB37 Female, DCE Interface Module(connects to DTE) |
| 129030 |
RS-422 DTE I/M |
RS-422/449, DB-37 Male, DTE Interface Module(connects to DCE) |
| 129013 |
X.21 DCE I/M |
X.21, DB-15 Female, DCE Interface Module(connects to DTE) |
| 129031 |
X.21 DTE I/M |
X.21, DB-15 Male, DTE Interface Module(connects to DCE) |
| 129057 |
TTL I/M |
TTL Interface Module W/BNC Connectors |
| 129085 |
T-1 I/M |
T-1 Interface Module, 1.544 Mbps, DB-15 Female |
| 129097 |
E-1 I/M |
E-1, G.703 Interface Module, 2.048 Mbps, 75 ohm BNC |
| 151028 |
HSSI DCE I/M |
HSSI, SCSI-I 50 Pin Female, DCE Interface Module(connects to DTE) |
| 175020 |
DS3 I/M |
DS3 Interface Module, 44.736 Mbps, 75 ohm BNC |
| 175021 |
E3 I/M |
E3 Interface Module, 34.368 Mbps, 75 ohm BNC |
| 175022 |
STS-1 I/M |
STS-1 Interface Module, 51.840 Mbps, 75 ohm BNC |
| 175040 |
EIA-644(LVDS) |
EIA-644(LVDS), DCE Interface Module, DB-25 Female, 52Mbps |
| 175045 |
EIA-644(LVDS) |
EIA-644(LVDS), DTE Interface Module, DB-25 Male, 52Mbps |
The Router Delay Simulator Plus (RDS+) allows users to test/stage critical DCE or DTE equipment for reliable network operation while simulating network delay times. The RDS+ provides a realistic simulation of physical network behavior with respect to time delays and bit errors. It supports user circuit rates up to OC-1 (51.84 Mbps) while providing delays from zero to a maximum of 8 seconds round trip. Both continuous random and burst errors are supported.
By using the RDS+ in place of or in series with a real data link (WAN) a wide variety of error conditions can be introduced under controlled and testable conditions.
The RDS+ has two data port interfaces that support EIA-644(LVDS), RS-232, RS-422/449, RS-530, V.35, X.21, DS1/E1, TTL, HSSI, DS3, E3, or STS-1. The data interfaces can be mix and matched where applicable, such as V.35 to-RS-530 connection.
Data Clocking can be driven from various sources. It can be provided via the TX and/or RX clocks of the various data port interfaces. Clocking can also be provided from a programmable clock generator internal to the RDS+. An independent external timing source can be used to frequencylock the internal timing generator via an external timing port on the back of the RDS+.
Data/Control-Lead Delay is programmable in either seconds or number of data bits. Delay may be specified independently to any value on each of the two bi-directional data paths. An option exists to include a control lead on some interfaces with the data delay.
The RDS+ can introduce Random and/or Burst errors into the data stream. These two error types can be used independently or in a combined fashion. The Random error rate is entered as a range of 1x10 -1 to 1x10 -12 errors per bit. Burst errors are entered as duration and interval. The error burst duration is from 1ms to 4 seconds and the interval between bursts is from 1ms to 16seconds. The type of error introduced can be the compliment of the data bit, a forced 0, or a forced 1.
The RDS+ contains one BERT generator and one BERT tester. The generator and tester can be independently attached to either data port. When activated the BERT generator replaces the assigned data port data with a standard x9+x5+1 polynomial function to generate a pattern of 511 bits in length. When activated the BERT tester can monitor the data port in either a continuous or a windowed mode. The continuous mode is manually re-triggerable. The windowed mode can be set for a monitor window from 1 to 256ms.
The RDS+ supports digital loopback of either data port. Loopback, Data Delay, Error Simulation, and BERT can all be used simultaneously on a given port. Installation and operation is provided via an operator console port. This port is a RS-232 port that has been tailored for use with HyperTerminal that comes standard with most PCs. RDS+ status and configuration is displayed in real time via this interface. An optional 10Base-T web enabled GUI interface is available for the RDS+.
- Bi-directional independent delay buffers per channel, Full Duplex
- Supports Split Delays
- Interfaces supported: EIA-644(LVDS), DS3, E3, STS-1, DS1/E1, TTL, HSSI, RS-232, RS-422/449, RS-530, V.35, and X.21
- Data Rates: 1.2K to 51.84Mbps
- Network Simulation Delays of 5mS up to 4 Seconds in 1mS increments, each data path
- Random Error insertion from 1x10-1
to 1x10-12 BER
- Burst Error insertion
- BERT 511 generator and tester
- Timing Internal or from either port interface. Accepts external clock for synchronization of internal timing
- Managed via serial port or web enabled GUI interface
- Status LED's for each port allows ease of connection and trouble shooting
- Internal 90-240 VAC auto sensing power supply
- Sturdy Metal Enclosure
Specifications:
| Application |
Interconnection of two devices, (e.g. terminal, modem, or other network or CPE with standard serial digital interfaces) located within proximity of each other while simulating clock generation, network delays, random and burst errors, and BERT capability
|
| Simulation Delay Times |
5 milliseconds(mS) to over 4000 mS, in 1 mS increments, or from 4 bits to over 65,000 bits in 1 bit increments. 4 seconds each data path, 8 seconds round trip delays. |
| Capacity |
Two (2) data port interfaces |
| Data Rates |
From 1.2K to 51.84Mbps, user selectable inputs via command prompt or GUI interface. |
| Data Port Interfaces |
Available in EIA-644(LVDS), RS-232, RS-422/449, RS-530, V.35, X.21, TTL, HSSI, DS1/E1, DS3, E3, STS-1 |
| Clock Sources |
Internal, Stratum 4 or Locked to External, Data Port RX/TX supplied |
| Data Format |
Synchronous or Asynchronous |
| Delay Units |
Specified in milliseconds or in bits |
| Random Error Rates |
From 1x10 -1 to 1x10-12 |
| Burst Errors |
Burst duration from 1mS to 4 Seconds
Off-interval from 1mS to 16 Seconds |
| Test Modes |
Loopback, 511 BERT |
| Operator Console |
RS-232 Async, 38.4kbs, (HyperTerminal recommended)
*Optional web enabled GUI interface |
| Indicators |
Power TXD, RXD, TXC, RXC, RTS, CTS, DSR/DTR, DCD for each user port |
| Power Source |
90-240VAC @10%, 50/60Hz, IEC Power Inlet, (2) 5mm Fuses |
| Environmental |
Operating Temperature....32º to 122º F (0º to 50º C)
Relative Humidity.............5 to 95% Non-Condensing
Altitude............................0 to 10,000 feet |
| Dimensions |
Height: 1.75 inches (4.44 cm), Width: 17 inches (43.18 cm), Length: 9 inches (22.86 cm) |
| Weight |
4.5 pounds (2.1 Kg) |
| Warranty |
Three years, Return to Factory |
| Ordering Information |
Part #: 175000
Model: RDS-PLUS, Base Unit
Description: Router Delay Simulator - Plus |
Part #: 175030
Model: RDS-PLUS, GUI
Description: Web enabled GUI interface
|
Interfaces Available:
| Interfaces Available |
| Part # |
Product Name |
TTL To Digital Interface Modules
|
| 129014 |
RS-232 DCE I/M |
RS-232, DB-25 Female, DCE Interface Module(connects to DTE) |
| 129032 |
RS-232 DTE I/M |
RS-232, DB25 Male, DTE Interface Module(connects to DCE) |
| 129010 |
V.35 DCE I/M |
V.35, MR-34 Pin Female, DCE Interface Module(connects to DTE) |
| 129028 |
V.35 DTE I/M |
V.35, MR-34Pin Male, DTE Interface Module(connects to DCE) |
| 129011 |
RS-530 DCE I/M |
RS-530, DB-25 Female, DCE Interface Module(connects to DTE) |
| 129029 |
RS-530 DTE I/M |
RS-530, DB-25 Male, DTE Interface Module(connects to DCE) |
| 129012 |
RS-422 DCE I/M |
RS-422/449, DB37 Female, DCE Interface Module(connects to DTE) |
| 129030 |
RS-422 DTE I/M |
RS-422/449, DB-37 Male, DTE Interface Module(connects to DCE) |
| 129013 |
X.21 DCE I/M |
X.21, DB-15 Female, DCE Interface Module(connects to DTE) |
| 129031 |
X.21 DTE I/M |
X.21, DB-15 Male, DTE Interface Module(connects to DCE) |
| 129057 |
TTL I/M |
TTL Interface Module W/BNC Connectors |
| 129085 |
T-1 I/M |
T-1 Interface Module, 1.544 Mbps, DB-15 Female |
| 129097 |
E-1 I/M |
E-1, G.703 Interface Module, 2.048 Mbps, 75 ohm BNC |
| 151028 |
HSSI DCE I/M |
HSSI, SCSI-I 50 Pin Female, DCE Interface Module(connects to DTE) |
| 175020 |
DS3 I/M |
DS3 Interface Module, 44.736 Mbps, 75 ohm BNC |
| 175021 |
E3 I/M |
E3 Interface Module, 34.368 Mbps, 75 ohm BNC |
| 175022 |
STS-1 I/M |
STS-1 Interface Module, 51.840 Mbps, 75 ohm BNC |
| 175040 |
EIA-644(LVDS) |
EIA-644(LVDS), DCE Interface Module, DB-25 Female, 52Mbps |
| 175045 |
EIA-644(LVDS) |
EIA-644(LVDS), DTE Interface Module, DB-25 Male, 52Mbps |
RDS-plus GUI Option W/dedicated IP Address:
RDS-plus W/serial Port Connection And Operation:
The RDS+ has a Power LED, one System Status LED and a set of status LED's for each Port interface, which allow the user to visually confirm the presence of data and clock, and certain control or status signals. The RDS+ is designed with state of the art digital CMOS technology.
The RDS+ is housed in a sturdy 1U high metal enclosure which can be rack mounted. It is powered by an integrated 90-240V 50/60Hz power supply. The RDS+ has a one year warranty and a 24 hour turnaround on warranty repairs.
Typical Simulation Example
Figure 1 illustrates a common example of utilizing the RDS+ between a pair of high-speed routers in a staged network to simulate the actual network conditions with respect to delays and potential line errors. In this example the RDS+, which has the capability to synthesize all standard telecom clocks, provides interface clocking to both routers. Using a computer, such as a laptop running HyperTerminal, an operator is able to adjust delay and error settings for various networking scenarios and test setups.
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| Simulating Network Conditions Between 2 Routers |
Other Network Simulations and RDS+ Uses
The RDS+ is capable of performing in configurations other than the previous example. Some of the possible uses may include the following:
1) Simulating the delays and transmission impairments of geosynchronous satellite networks
2) Measuring error recovery performance of DTE when inserted between a modem and DTE
3) Modeling number-of-bit delays to simulate buffer and queue effects
4) Buffering between clock sources with long-term cyclic drift (e.g. Doppler effect), where delay is not critical
5) Simulating long-haul terrestrial transmission delays
Internal Clock Timing
Internal Clock Timing is normally used when both RDS+ interface cards are DCEs. In this configuration, clocks are sent from the RDS+ to both attached devices. The internal clock source is a Stratum 4 standard clock when it runs without an external timing source. An external timing source may be used with the internal oscillator to frequency-lock the generated internal clocks to an external reference. The external reference must be a multiple of 8KHz, within 100 ppm of nominal frequency, up to a maximum of 2.048 Mbps.
Flow-through Clock Timing, Unidirectional and Bidirectional
Flow-through Timing allows one attached device to clock the RDS+, and to pass that clock timing to the other attached device. Typically, the RDS+ will have one DCE and one DTE to facilitate this configuration. In this application, the internal clock will not be used. With the flexibility of assigning and routing interface clocks on the RDS+, the clock timing flow may be either bidirectional or unidirectional. Unidirectional works best when both cards are standard EIA-type interfaces, where one is a DTE and receives a transmit and receive data clock, and the other is a DCE which sends a transmit andreceive data clock. In this case the timing flow is from DTE to DCE.
Bidirectional timing flow is usually associated with interface types that have a receive clock and a transmit clock that travel in the same direction as the corresponding data signal. This is typical of DS-1, DS-3, and the TTL Interface Card. Timing usually passes through the RDS+ in the same direction as the data. Since the data is bidirectional, then so is the clocking. With bidirectional timing it is also not required that the two clock signals in opposing directions have the same frequency (split speed).
Independent Clock Timing
When both interface cards are DTE, then they both must accept timing from an attached device. It is possible to use the RDS+ in such a configuration, but it is important that the user must be able to insure that the separate clocks are timed to the same clock source, otherwise the delay buffer will not provide constant delay.
There are also applications where the RDS+ delay buffer may be used as an elastic storage buffer, where the two independent clock sources are timed differently. In this case the delay through the buffer is not constant, but variable over time.
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