Paradyne 3551 manual Upgrades Available, Technical Specifications, Port TDM/Flex

About Your DSU

2-Port TDM/Flex

The 2-port TDM/Flex is a separate circuit card that attaches to the Model 3550 DSU. It allows independent ports to share one standard digital point-to-point facility. The 2-port TDM/Flex provides the following features:

•Port capacity. This feature permits the DSU to operate as a digital sharing device and provides two independent ports. Port 1 is on the DSU and Port 2 is on the 2-port TDM/Flex. Either port can operate as an EIA-232 or V.35 interface.

•Multiplexing. With this option, time division multiplexing can be performed using two independent ports to share one standard DDS point-to-point circuit.

•Line speeds. The TDM/Flex operates at all line speeds supported by the DSU: 2.4, 4.8, 9.6, 19.2, 38.4, and 56 kbps. For LADS operation, 64 kbps is also supported.

•Port speeds. Each port can be set to 1.2, 2.4, 4.8, 9.6, 14.4, 19.2, 48, 56, or 64 kbps. In 2-port TDM/Flex applications, the sum of the port speeds cannot exceed the line speed.

•Asynchronous operation. Although the DSU provides synchronous transmission through the DDS network, any port can be configured for asynchronous operation. When the 2-port TDM/Flex is installed, asynchronous-to- synchronous conversion can be performed. Asynchronous data rates of 150, 300, 600, 1200, and 1800 bps are supported, along with the synchronous data rates.

•Digital sharing. With this feature, the ports can share the same channel. All ports in a digital-sharing group operate at the same speed, and all receive the same data. When configured for DSD (digital-sharing device) port contention, only one port at a time is allowed to send.

•Elastic store per port. A transmit elastic store buffer is provided for each port for the support of extended circuits. Both digital and analog extensions are supported.

•Switched-carrier emulation. In 2-port TDM/Flex transmission, switched-carrier emulation is optional for each port, for both the inbound (toward the control DSU) and outbound (from the tributary DSU) directions.

•NMS control. Control of a 3550 DSU with 2-port TDM/Flex can be performed from a 6700 Series NMS or the DSU's DCP.

•Point-to-point backup. A 3550 DSU with 2-port TDM/Flex can also have a DBM installed for point-to-point dial backup. If backup is at a different speed than the DSU's speed, TDM/Flex operation automatically changes to the lower speed.

Upgrades Available

Although your DSU may not currently have a DBM or 2-port TDM/Flex installed, you can add these features at a later time. Both the DBM and 2-port TDM/Flex features are available as upgrades.

You can order the option you want and install it yourself (referred to as a field installation). Refer to the Equipment List in Appendix F for the feature number to order.

Technical Specifications

Tables 1-1 through 1-4 list the technical specifications for the following:

•General specifications that apply to all Model 3550 and 3551 circuit cards (Table 1-1)

•Specifications for the Model 3550 and 3551 DSU only (Table 1-2)

•Specifications for the V.32 DBM (Table 1-3)

•Specifications for the 2-port TDM/Flex ￿ only used with a Model 3550 (Table 1-4)

3550-A2-GB20-20 December 1996 1-3