COMSPHERE 3550 Series Data Service Units
Table
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DSU Configuration Options
Rate(Kbps): 9.6 |
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Next | 64L | 56 | 38.4 | 19.2 | 9.6 | 4.8 | 2.4 | Prev |
DSU Rate. Sets the data rate (in kbps) of the DSU, which must be set to match the speed of the digital (DDS) circuit.
64L | Ð | Select for 64 kbps LADS operation. |
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56 to | Ð | Set to match the speed of the DDS circuit. |
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2.4 kbps |
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NOTE: Both the control and tributary DSUs must be set to the same value. |
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PrtSp(Kbps): | 9.6 |
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Next | 64 | 56 | 48 | 19.2 | 9.6 | 4.8 | 2.4 | 1.2 | Disab | Prev |
Port Speed (not displayed with a TDM/Flex installed). Sets the speed of the DTE port interface. The port speed is set to any value less than or equal to the DSU Rate(Kbps) set above. The DSU performs rate adaption if the port speed is set to less than the DDS rate.
64 to | Ð Select the DTE's port speed. |
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1.2 kbps |
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Disab | Ð Disables PrtSp(Kbps). |
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TxClkSource: DDS |
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Next | Int | Ext | Prt1 | Prt2 | DDS | Prev |
Transmit Clock Source. Specifies the transmit timing source for the DSU. | ||||||
Int | Ð Select internal clock source to take timing from the DSU. | |||||
Ext | Ð Select external clock source when timing is taken from the external Transmit Timing lead on Port 1 only | |||||
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| (not displayed if a TDM/Flex is installed). | ||||
Prt1 or | Ð Select the port that timing is to be taken from, using the selected port's external Transmit | |||||
Prt2 |
| Timing lead (Prt2 is only displayed if a TDM/Flex is installed and enabled). | ||||
DDS | Ð Select the DDS network when the DSU is connected to a DDS network and the network provides the | |||||
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| timing, or when a LADS configuration with a remote DSU is providing the timing. | ||||
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Msg Clamp: Enab |
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Next | Enab | Disab | Prev |
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Message Clamping (only displayed when Full Mode is enabled). Controls data lead behavior when disruptive diagnostic tests and commands are received from the remote DSU. It applies to both the DSU and DBM.
Enab | Ð | Select to prevent diagnostic messages from reaching the DTE interface. | ||
Disab | Ð | Select if the remote DSU is configured for switched RTS; that is, RTS Control is set to DTE in the General | ||
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| (Gen) configuration options. | ||
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TxElasStor: Disab |
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Next |
| Enab | Disab | Prev |
Transmit Elastic Store (only displayed when Full Mode is enabled and a TDM/Flex is not installed). Using a transmit buffer on the DSU's transmitted data (TXD) lead, serial data is clocked into the DSU's elastic store using clock provided by the extended circuit received clock lead. The DSU's own system timing is used to clock data out of the buffer.
Transmit Elastic Store is reset each time the unit
Enab | Ð | Select enable when interfacing with a DCE that receives clock from its own network source (e.g., a T1 |
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| MUX or DSU that is on the DDS network). |
Disab | Ð | Select disable if you do not have an extended network or are providing the clock source to the extended |
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| network (e.g., LADS with external clock). |
December 1996 |
