Remote Data Terminal Hook-up / DDS

Problem
You have a successful growing travel agency in a suburban area. You've decided to expand by adding a small site within the local shopping mall. The mall's communication center can provide you with a single DDS circuit to the booth. How do you access the DDS circuit with your Coastcom channel bank?

Solution
Coastcom's All Rate OCUDP and standard OCUDP support DDS requirements.

How Does It Work?
The OCUDPs plug into your channel bank and act just like a carrier's DDS card. They provide remote and local loopback testingloopback testing capabilities. A CSU/DSU is required to complete the interface to the terminal at the mall and the computer system at the travel agency headquarters.

Figure d1. Remote Data Terminal Hookup / DDS

What Actually Occurs?
Waylon owns a successful and growing travel agency located in an urban area. To serve his growing customer base better and more conveniently he has decided to add a mini agency in a booth at the local mall.

To do this he needs to have an on-line connection between his main store and the mall. Waylon installed a T1 earlier in the year to take advantage of 800/WATS services and data connections to airlines, car rental agencies, and hotels.

The Serendipity Mall has a T1 with open transmission channels. The mall will lease a DS0 to Waylon for his booth. The booth is ten thousand feet from the mall's communication room. A standard data interface, RS-422 or V.35, can only extend a distance of a thousand feet. Coastcom's OCUDP and All Rate OCUDP can extend a data connection out to fifteen thousand feet or more (depending upon wire size and data rate).

The RBOC has suggested that a DDS line be used to connect the main store to the booth. The 56 Kbps DDS line will be routed out through the mall's standard T1 service to the main store. Waylon is using more of his T1 and adding minimal cost to his current network.

Sarah is the travel planner working the booth at the mall. A potential customer requests booking information and costs on Caribbean cruises. Sarah uses her terminal to directly access the cruise line's computerized booking system.

With an All Rate OCUDP, you can initially start out with a lower cost, lower speed service. If demand requires greater throughput, you can increase the data rate without changing channel cards.

How Do You Set It Up?
Set the OCUDP or All Rate OCUDP for standard 56 Kbps mode.

What Do You Order?
You will require an OCUDP or All Rate OCUDP and a D/I Mux III at both the main store and the mall. You will also need two 56 Kbps DDS-compatible CSU/DSUs.

Switched 56 Data Terminal

Problem
You are coordinating a scientific project that several universities and research institutions are also working on. They need to send you the results of experiments daily. Since the experimental data on your subject is extensive and complex, a high speed data circuit is required to access all of the information.

Solution
A Switched 56 OCUDP in conjunction with a Switched 56 DSU allows a user to call other Switched 56 DSUs as easily as a standard telephone makes a call.

How Does It Work?
A Switched 56 OCUDP installed in a D/I Mux III offers the same interface to a Switched 56 DSU as a DDS line. The LDC (T1 provider) would only need to program the existing transmission channel for Switched 56 operation.

Figure d2. Data Terminal/Research Library

What Actually Occurs?
Beth is investigating the possibility of growing salmon in a fish farm. She has just received the first test eggs and is deciding on the environment for hatching and raising the salmon.

Beth types in the number of the Delta Research Center on the DSU keypad. The DSU sends the digits to the OCUDP which converts the signal into T1 for connection to the PSN. The PSN makes the connection to the Delta Research Center's computer on its Switched 56 circuit. After entering in the proper security codes, Beth gathers the latest data on hatching salmon eggs.

When Beth is done gathering information from the Delta Research Center she disconnects the circuit. She can then call the University of Clearwater, in a similar fashion, to gather data on the life of salmon. She is only paying for the service when she's using it, as opposed to a dedicated line.

How Do You Set It Up?
Place an OCUDP into a channel card slot of your D/I Mux III. Wiring from the OCUDP to the Switched 56 DSU can be up to 15,000 feet depending on wire type. Configure the OCUDP for Switched 56 operation.

What Do You Order?
Both the All Rate OCUDP and 56 Kbps OCUDP can be used for Switched 56 operation. A D/I Mux III is required. A Switched 56 DSU is also required.

Switched 56 Dial-up Video

Problem
You have a corporate law firm with several major offices in metropolitan areas. Your law library and paralegal staff are located in Chicago. When a client requires extensive background work your staff makes use of the paralegals at the Chicago center. Communications have to be made quickly to access information. There have been several delays and misunderstandings because of the lack of rapport between the Chicago center and the satellite offices.

Solution
A Switched 56 OCUDP in conjunction with a Video Conference CODEC allows your lawyers to communicate in a more timely and effective manner with the paralegals at the Chicago center.

How Does It Work?
A Switched 56 OCUDP installed in a D/I Mux III offers the same interface to a Video Conference CODEC as a DDS line. The LDC (T1 provider) would only need to program the existing transmission channel for Switched 56 operation.

Figure d3. Switched 56 Dial-up Video

What Actually Occurs?
Lawyer, Dorothy Sandford, is working on the AZ Chemical case. A fire destroyed AZ Chemical's Ruby City facility which manufactures paint. AZ Chemical believes a failure in the electrical system, supplied by the local utility company, is responsible for the fire. The local utility company has extensive resources to fight such an accusation.

Dorothy is the prosecutor for AZ Chemical. She needs to investigate similar cases and bring in experts in the electrical, chemical, and environmental fields to prove out the source of the fire. This will be a long project with many expert witnesses on both sides of the case. She requests help from the paralegals at the Chicago resource center.

That afternoon Sam, the Chicago center personnel coordinator, and two of his paralegal staff, Emily and Brian, call up Dorothy on the Video Conference CODEC. Dorothy goes over the depth of the project with everyone involved.

After the interviews, Dorothy calls Sam to accept the candidates. They then arrange another video conference with Emily and Brian for the first assignment of tasks. Since Switched 56 is a dial-up service, video transmission costs are only charged during the conference.

How Do You Set It Up?
Place an OCUDP into a channel card slot of your D/I Mux III. Wiring from the OCUDP to the Video Conference CODEC can be up to 15,000 feet depending on wire type. Configure the OCUDP for Switched 56 operation.

What Do You Order?
Both the All Rate OCUDP and 56 Kbps OCUDP can be used for Switched 56 operation. A D/I Mux III is required. Coastcom does not provide video CODEC equipment.

Campus Network Extension

Problem
You are the communications director on a college campus and coordinate the telecommunications from the LEC and LDC. The carrier's POP is in the switch room which houses the campus PBX and is located next to the computer room. Data received over T1 is broken down to the data interface level (RS-232C, V.35, RS-449) on the D/I Mux III and supplied directly to the computer room. The botany department wants to subscribe to a new data resource network. However, the botany building is several thousand feet from the POP and cannot be serviced by standard data interfaces.

Solution
An All Rate OCUDP can supply data to locations up to 15,000 feet or more, depending upon wire type and bit rates, from the POP.

How Does It Work?
An All Rate OCUDP installed in a D/I Mux III offers the same interface as a DDS line. The LDC (T1 provider) only needs to program the transmission channel for DDS operation.

Figure d4. All Rate OCUDP DDS Service

What Actually Occurs?
Nancy is studying the feasibility of growing rare South American plants in a greenhouse. Before she creates an environment she needs to examine the soils and weather conditions required for germination and growth. The resource center has this type of information.

At the botany center's computer, Nancy accesses the CSU/DSU communications port by calling up the communications program. The CSU/DSU communicates to the OCUDP with a bipolar signal. The OCUDP and D/I Mux III then convert the signal into a DS0 channel, within a T1, for transmission to the research center.

Nancy requests information from an alphabetical index. Nancy can view documents stored in the resource center's document imaging system or have the document file sent to her over the communications link.

The All Rate OCUDP can supply DDS data at 2.4, 4.8, 9.6, 56 or 64 Kbps. One DS0A circuit is supplied by the All Rate OCUDP. The DDS signal from the OCUDP is transferred to a CSU/DSU which converts it into a standard data interface the computer can understand. The circuit is always operating; the botany computer is permanently connected to the service and accesses the main resource center by selecting the CSU/DSU communications port.

How Do You Set It Up?
Place an All Rate OCUDP into a channel card slot of your D/I Mux III. Wiring from the OCUDP to the CSU/DSU can be up to 15,000 feet depending upon the wiring and bit rates. Configure the All Rate OCUDP to match the data rate supplied by the service.

What Do You Order?
The All Rate OCUDP and CSU/DSU can be used for DS0A DDS circuits. A D/I Mux III is required.

Telecommuting / DDS

Problem
Your R&D company is located in a large urban area. Commuting to and from work has become a problem for many of your key engineers. The local transportation bureau is offering incentives to employers who offer programs to cut down on the traffic congestion. You've decided to allow engineers to telecommute three out of five days per week. Your LANLAN network has modem connections that operate at a synchronous data transmission rate of 19.2 Kbps. The RBOC can provide you with a subrate DDS circuit from the EO to engineers' homes. How do you terminate the subrate DDS circuit with your Coastcom channel bank?

Solution
Coastcom's DS0A Subrate Data Multiplexer (SDM) channel card can terminate a subrate synchronous DDS circuit.

How Does It Work?
The DS0A SDM channel card and PSN seamlessly extend the LAN to incorporate remote sites without notable changes in LAN service to the users.

Figure d5. Remote Data Terminal Hook-up / DDS

What Actually Occurs?
FIRM Engineering is located in the center of a high density urban area. More and more of their employees have sought affordable housing in the surrounding suburban areas. The problems of commuting have prompted the management to consider an alternative to their standard five day work week. They've decided to implement a pilot telecommuting program for their research engineers.

Amanda and Nick are research engineers at FIRM Engineering. Amanda has opted to try telecommuting. She has a computer workstation in her home. Nick prefers working at headquarters. The DDS lines between the EO and the homes are 56 Kbps leased lines. The 56 Kbps leased line are multiplexed together at the EO and sent to the PSN where they are cross-connected and sent to FIRM Engineering over T1.

The T1 is terminated into Coastcom's D/I Mux III channel bank. The SDM DS0A card interfaces with an RS-232C port of the LAN and supports the remote workstation as if it was co-located. Both Amanda and Nick can communicate through the telephone line to each other as if Amanda were still in the next cubical. Electronic mail, research data, reports, and memos are easily transported back and forth.

The SDM DS0A card is DDS compatible eliminating the need for expensive proprietary systems. It can communicate with any other subrate DDS equipment. The SDM DS0A card also has the added advantage of a direct RS-232C connection eliminating additional CSU/DSU equipment at the LAN end.

Their current system allows for a 19.2 Kbps synchronous circuit. The local telco will provide them with a DDS line which can be terminated in the SDM DS0A card at the headquarters' end. A synchronous RS-232C 19.2 Kbps CSU/DSU can be placed at the engineers' homes to terminate the line.

How Do You Set It Up?
Set the data rate to match the data rate at the modem end.

What Do You Order?
You will need one SDM DS0A card for each connection and a D/I Mux III at the corporate headquarters. You will need DDS CSU/DSUs for each remote site.

Automatic Teller Machine / DDS

Problem
As the communications manager for a major banking system it is your responsibility to maintain inter-banking and intra-banking telecommunications systems. One aspect of this large communication network is Automated Teller Machines (ATMs). You have ATMs placed within each bank and at grocery outlets. Many locations have multiple ATMs. How can you efficiently interface to the ATMs throughout your network?

Solution
Coastcom's DS0B Subrate Data Multiplexer (SDM) channel card can terminate up to five subrate synchronous DDS circuits using only one DS0 transmission channel.

How Does It Work?
The SDM DS0B works like a "mini multiplexer/demultiplexer" taking multiple low speed circuits and combining them into a larger circuit.

Figure d6. Multi-circuit Remote Data Terminal Hook-up / DDS

What Actually Occurs?
Sharon is the communications manager for the Second Municipal Bank. She needs a method of efficiently transporting low speed synchronous data over an existing T1/PSN network.

By using Coastcom's DS0B channel cards, Sharon can combine multiple subrate DDS circuits onto a single DS0. This allows Sharon to add up to five terminations at one site using only one DS0.

Because Coastcom's SDM DS0B channel card meets all DDS specifications, expensive proprietary solutions are eliminated. Sharon can choose a solution that meets her needs now and allows for future growth. At sites that warrant a full T1, Sharon can use Coastcom's D/I Mux III and SDM DS0B channel cards. At sites that do not require a full T1, Sharon can use standalone subrate multiplexers.

Both the SDM DS0B channel card and the standalone subrate multiplexer use standard DDS coding to communicate throughout the PSN. Coastcom's SDM DS0B channel card has the added advantage of allowing the DDS circuits to directly connect over an RS-232C interface. A direct RS-232C connection eliminates the need for costly CSU/DSU modems.

In the example shown, two ATM machines are connected to the standalone subrate multiplexer. They use a standard RS-232C hardware handshakinghandshaking control sequence called RTS/CTS to tell the multiplexer when data is coming. The data going into the standalone mux is multiplexed up into a single DS0 and sent over a 56 Kbps leased line to the EO. The EO combines the 56 Kbps DS0 with other DS0s and sends them out the PSN, where they are cross-connected and sent to the bank's data processing center. Two ATMs are also connected to Coastcom's SDM in a D/I Mux III and multiplexed on a T1 for connection to the PSN.

How Do You Set It Up?
Set the SDM DS0B card in its synchronous DDS mode. Set the data rates for the five subrate channels to your required data rates.

What Do You Order?
You will need one SDM DS0B and one D/I Mux III at the data center. You will need standalone DDS compatible subrate multiplexers for each remote site. If the remote sites warrant a T1 multiplexer, the subrate multiplexer can be replaced with Coastcom's D/I Mux III and an additional SDM DS0B channel card.

ESF to D4 Framing Conversion

Problem
You are receiving T1 from the PSN which goes into your D/I Mux III for digital data services and to a digital switch for voice services. The T1 from the PSN is in the ESF framing format. However, your digital PBX uses the SF framing format. Since both T1 ports on a D/I Mux III require the same framing format, you require a framing format conversion.

Solution
Coastcom's Tandem T1 Unit (TTU) channel card provides D4 to ESF or ESF to D4 framing conversions. It also provides AMI to B8ZS or B8ZS to AMI line coding conversions.

How Does It Work?
The TTU channel card is a protocol converter. It translates the B8ZS line code and ESF framing format into D4 and AMI.

Figure d7. Framing Format Conversion

What Actually Occurs?
Simone is a telecom manager for a mail order catalog company. They have a D4 digital PBX connected directly over T1 to the PSN. Her warehouse is coming on line with a new inventory control system which will tie directly into the order center and continually update stocking information. She will need four clear channel DS0s to accommodate the data circuit to the DTE within her current network.

The LDC has offered to change her T1 from D4 to ESF to accommodate the clear channel DS0s. She has 20 channels (DS0s) designated for connection to her digital PBX for the telephone network.

Simone has decided to use the TTU to handle her ESF to D4 conversion for the PBX connection.

The D/I Mux III demultiplexes the incoming T1 with ESF framing into 24 DS0s. Once the T1 is demultiplexed the framing format is no longer relevant. The TTU is allotted "n" number of DS0s from 1 to 24. In the D/I Mux III a map is set up to send 20 DS0s to the TTU. The TTU can run either D4 or ESF framing formats. In this case D4 is selected. Since the TTU does not share the T1 interface bus and is actually considered a data card it can run independently of the D/I Mux III's framing format. The TTU has a T1 interface just like a standard T1 interface on the D/I Mux III. So it can connect directly to the T1 interface of the digital PBX.

The four clear channel DS0s can supply a high speed bit rate of 256 Kbps.

How Do You Set It Up?
Connect your incoming T1 from the PSN to the T1-1 connection on the D/I Mux III. Make sure the T1-1 is set up to match the framing format of the incoming T1. Plug a Tandem T1 Unit into the D/I Mux III in any open channel card slot. Map the D/I Mux III to send the appropriate number of DS0s to the TTU. Configure the TTU's framing format to match the PBX's and connect them together.

What Do You Order?
You will require one TTU and a D/I Mux III for this application.