************************************************************************ DDN MGT Bulletin: 9407 DISA DDN Defense Communications System 30 Jun 1994 Published by: DDN Network Info Center (NIC@NIC.DDN.MIL) (800) 365-3642 DEFENSE DATA NETWORK MANAGEMENT BULLETIN The DDN MANAGEMENT BULLETIN is distributed online by the DDN Network Information Center under DISA contract as a means of communicating official policy, procedures and other information of concern to management personnel at DDN facilities. Back issues may be read through the TACNEWS server ("@n" command at the TAC) or may be obtained by FTP (or Kermit) from the NIC.DDN.MIL host [192.112.36.5] using login="anonymous" and password="guest". The pathname for bulletins is ddn-news/ddn-mgt-bulletin-nn.txt (where "nn" is the bulletin number). ************************************************************************ 1. This bulletin is also available in WordPerfect 5.2 format which can be retrieved via anonymous FTP from nic.ddn.mil with filename, "/ddn-news/ddn-mgt-bulletin-9407.wp52". The version attached below does not contain the embedded two diagrams. 2. All comments concerning this document should be forwarded to the appropriate service/agency PMO by 21 July 94. Service/agency PMO will then consolidate the service/agency input and forward it to DISA. 3. This document is the router supplement (Supplement 2) to the DISN Network Management Operational Policy and Procedures (DISA Circular 310-70-X). It is not a supplement to the current DDN Node Site Coordinators' Guide. SUPPLEMENT II TO DISAC 310-70-X NODE SITE COORDINATORS GUIDE, DISN ROUTER NODES CHAPTER 1. GENERAL INFORMATION 1-1. Overview of the Defense Information Systems Network a. This guide is for use by Defense Information Systems Network (DISN) Router Node Site Coordinator (NSC) personnel. There are two major components of the DISN. The first component is a transport or multiplexer layer. It is described in supplement I. The second component is the router, or network, layer; the router layer will be discussed in this supplement. b. A number of Service or Agency (S/A) networks have been or will be interconnected to form the DISN router layer. Equipment manufactured by Cisco Systems, Menlo Park, CA is used at DISN router sites. Routers from other vendors, along with support equipment, e.g. modems, CSU/DSUs, encryption gear, packet switch equipment (PSN), and multiplexers may also be used to completely populate the DISN node site equipment rack(s). Typical equipment configurations are described in chapter 3. c. What is DISN? As mentioned above, DISN's roots lie in S/A predecessor networks. The original DISN concept called for total S/A integration of all communications and ADP assets. The DISN router layer represents one portion of that total, namely the data network portion. Figure 1-1 depicts a typical, generic DISN node installation. The routers, labeled "Premise Router" and "DISN POP Router" (POP stands for "point of presence"), are shown in relationship to other components. The router NSC's responsibilities concern the components that are inside the box labeled "DISN Router Node." Note also that the network management center, referred to as the level II NMC or simply level II, has responsibilities that overlap those of the NSC. 1) The premise router is owned, operated, and managed as a base (level III) communications or ADP asset. It will not be managed by the DISN level II network management center and it will not be loaded into the DISN global data base. On the other hand, the symbol labeled POP Router refers to a DISN asset. It is loaded in the DISN database and is owned and managed by the DISN level II. The router, which can be referred to by other terms, such as a "hub" or "IPR" (Internet Protocol Router), is the primary equipment component of the DISN router node. 2) Subscribers may desire that DISA manage their premise routers. If so, agreements between DISA and the subscriber will be coordinated and documented. Page 1 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes d. A DISN node represents a concentration point where information from diverse sources is combined electronically to form an aggregate. The cost to transport the aggregate can be lower than it would be to transport each portion individually. The component labeled "MUX" (a contraction of the word multiplexer) performs the combining process. The routers also provide combining functions. A router determines a packet's destination from the header within that packet. The mux does not look at the information passing through it; instead the destination for all data passing through a given port is determined by the programming of the mux, thereby providing point to point services. e. A subscriber sends data to the node via a "tail" circuit. Data received from other nodes is returned to the subscriber through the same tail. The bi-directional data flow is referred to as full duplex; the tail is capable of sending and receiving at the same time. f. Data rates on the subscriber side are dependent on the type of connection. Typical routers can terminate a variety of serial protocols as well as ethernet and other LAN protocols. The data rate between routers, that is between the premise and POP router, will depend on subscriber requirements and the method of connection. [Figure 1-1 Omitted] g. Subscriber service through the router network is functionally connectionless. The subscriber only needs to be physically connected to a node. Data traffic will find its way to the destination address(es) automatically and by the most expeditious route. h. DISN router network management (NM) is accomplished via special NM tools, some of which are part of the node equipment. As a general rule these tools will be manipulated by NM personnel at the Columbus, OH level II NMC (or at other locations, such as DISA Europe or DISA Pacific). These centers are staffed 24 hours per day, seven days per week. See chapter 2 for information regarding contact of the level II center(s). 1-2. Training. a. To perform the duties of the NSC as outlined in Chapter 2, the person performing those duties will require training. THE NSC WILL NOT BE THE SOLE PERSON RESPONSIBLE FOR DISN NODE SITE EQUIPMENT. Each node will normally be serviced and maintained through a global DISN contract. All maintenance will normally be Page 2 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes coordinated (in real time whenever possible) with the responsible level II. In many cases the level II operators can correct problems without on- site assistance. NSC training is required to ensure that a local person with a basic understanding of the equipment is available locally when emergencies arise. b. DISA is responsible for DISN NSC training. Each node site location should receive two router equipment training slots, one for the primary NSC and the second for his alternate. c. NSC training will be furnished by DISA at no expense to the services or agencies except for travel and per diem. This training will be conducted at "regional" sites on a recurring basis. The training schedules will be coordinated between the area commanders and the S/As. d. DISN-sponsored training will include the following equipment categories: Cisco AGS+ (or equivalent) router DISN Standard Node Configuration(s) Patch Panels/Fantails No specific prerequisite schools or training are required. Trainees are expected to have a basic understanding of the fundamentals of communications, particularly data communications. Some background or experience with transmission systems and tech control will also be helpful. The NSC duties will only require an individual to provide support to contract repair personnel. Page 3 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes CHAPTER 2. DISN NODE SITE COORDINATOR ROLE 2-1. Overview. a. A DISN router or internet protocol router (IPR) node site is the physical place where the DISN backbone router equipment is located. Normally, this will consist of a router cabinet, a communications cabinet(s) and, in most cases, one or more encryption rack(s). The Node Site Coordinator (NSC) is the sponsoring communications and information systems Command or Agency's designated representative with authority to: (1) Coordinate, at the node site, the physical site preparation and the installation and activation of node, interswitch trunk circuit and access circuit equipment. This coordination will include interactions with the DISN level II Network Management Center (NMC), local telephone personnel, and service/agency engineering/installation (E&I) activities. (2) Ensure 24-hours, 7 days per week continuous operation of the node by providing or making provisions for local site assistance in case of node or circuit degradation or outages. (3) Accomplish the administrative responsibilities described in paragraph 3 below. b. While the NSC may delegate some tasks to other personnel, the NSC is responsible to DISA for all node site matters. Preferably, the NSC should be a member of the sponsoring communications or information systems operations and maintenance command or agency organizational sub-unit in whose facility the node is located. c. In order to keep a current database of all DISN NSCs, the NSC must inform the Network Information Center (NIC) of all changes to NSC assignment, i.e. name address phone number, e-mail address, etc. This may be accomplished by e-mail to the following address: hostmaster@nic.ddn.mil Page 4 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes An info of the e-mail will also be sent to the DISA Area Network Manager and the Area NMC. 1) CONUS NMC: DISN Network Management Operations Center DISA/DISO code UNRO, Bldg 27-3 3900 East Broad St. P.O. Box 1605, Columbus, OH 43216 or via E-mail: crose@dsac.dla.mil The telephone number is 1(800) 554-DISN or, (614) 692-9143 (DSN) 850-9143 2) European NMC: DISN Network Management Operations Center DISA-Europe Code DEOS or via E-mail: eurmilmg@ddn-eur.ddn.mil The telephone numbers are: DSN 430-5817 commercial: +49-711-680-5817 (outside Germany) 0711-680-5817 (inside Germany) 3) Pacific NMC: DISN Network Management Operations Center DISA/DISO Code: or via E-mail: The telephone numbers are: 2-2. Local, On-Site Technical Assistance Responsibilities. a. The NSC should personally provide or arrange for the provision of, local on-site assistance to the NMC controllers on a 24-hour, 7 day a week basis. If the node site is located in a facility that is not manned on a 24-hour, 7 day a week basis, the NSC must ensure that local, on-site assistance is provided within 2 hours of a request by the level II NMC. The NSC must inform the level II whenever the local site can not be entered outside of normal duty hours or whenever the two hour limit must be exceeded. These procedures are necessary for the level II to be able to assess the effects of an outage at that node. For those Page 5 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes sites that are managed under DISA contract, DISA Headquarters will insure access. In those cases a civilian contractor NSC may be named. b. The NSC and other local operations or maintenance personnel will provide assistance under the telephonic instruction of NMC controllers. c. Local site personnel are not to attempt to interfere with, tamper with, or perform maintenance other than external cleaning, on any of the DISN node site equipment, unless requested to do so by the NMC. d. The NSC coordinates and monitors scheduled and unscheduled corrective maintenance, and scheduled preventive maintenance, as directed by DISA or the network NMC. 2-3. General Administrative Responsibilities. a. The NSC is responsible for general administration of the node site in several areas. These areas and NSC functions within them are presented below. For a more detailed discussion of site administrative procedures, refer to site-specific documentation available at each site. b. Hardware Accountability. (1) The NSC provides for care and safekeeping of all installed node equipment, and equipment shipped to the node site for future installation. The DISN integrated logistic support plan (ILSP) should be consulted for specific equipment accountability procedures. Briefly stated this plan requires that DISN node equipment must be accounted for according to current DoD and S/A regulations. Typically the node site equipment will be shipped to base supply, pending initial installation. The installing team will arrange for transfer of the equipment for initial installation and will assist the NSC with arranging for transfer of custodial responsibility in accordance with S/A procedures. The node site equipment remains DISA property even though it may be picked up in the site's property book for custodial purposes. (2) The NSC may be requested to provide for the temporary storage of some node circuit activation/modification parts, assemblies and materials. These items are expected to be relatively small, e.g. a cable assembly, and infrequently sent, e.g. once or twice per year. Typically this material will need to be retained for only a few days. Page 6 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes c. Site Access Control and Security. (1) The NSC coordinates access to the node site. DISA will provide the NSC with an initial roster of personnel authorized access to the DISN router node equipment. Personnel not on the access roster may be added by the NSC with the concurrence of the DISA area network manager or the DISN level II NMC. The NSC shall maintain a copy of the current access roster to the DISN equipment. The level II NMC, including the area or theater network operations center, will coordinate, or be made aware of, all site visits. (2) The NSC should ensure that installed node site equipment is not altered, tampered with, or moved without proper authorization from DISA. (3) DISA will define and the NSC shall implement site physical security procedures as specified in applicable DoD and service directives. These directives are incorporated into the DISN Security Architecture. Each node's initial installation plan (IIP) will in turn reflect the specific security requirements for a given site. d. Carrier and Cable Access for Tail Circuits. The NSC shall ASSIST circuit implementation coordinators, service E&I activities and local commercial telephone company installation/maintenance personnel by ensuring, when appropriate, that cable pairs or channels are assigned. Any local service requests (LSRs) required will be the ADMINISTRATIVE responsibility of the NSC. Tail circuits could consist of one of the following types: (1) Local tail Circuit. When the end customer is on the base and requires dry (i.e. no voltage applied) cable pairs or other clear channel media between the DISN node site and the customer's location, the NSC is responsible for coordination with the local installation authority such that cable pairs are provisioned to the customer's site as stipulated in the TSO. (2) Commercial Tail Circuit. The end customer is off base. A leased tail is required between the DISN node and the customer's location; the NSC is responsible for ensuring that the commercial telephone company installers are provided with access to the node site. (3) The subscriber's tail circuit may be a single circuit or it may be "bundled", that is combined electrically with other circuits. Page 7 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes e. General Administration and Coordination. (1) The NSC will store documentation issued by DISA and the Network Management Center, e.g., DCA and DISA Circulars, Management Bulletins, etc. (2) The NSC is the focal point for node site operations. The NSC or designated representatives should maintain close contact with all network entities (i.e., users, NMC, local telephone service personnel, host administrators, etc.) (3) To support both liaison and local site assistance functions, the NSC should maintain a list of telephone numbers. This will include as a minimum, the Area NMC, the Host Administrator for each connected host at that site, and other telephone numbers such as those of the servicing telephone company, the local technical control, the local communications O&M unit representative, contract personnel responsible for equipment maintenance, etc. (4) The NSC may be identified by DISA as the node site point of contact on all Telecommunications Service Requests (TSR's), Telecommunications Service Orders (TSO's) for access circuits and interswitch trunks (IST) terminating at the node site. In addition, if a Circuit Control Office (CCO) cannot be assigned in a TSO, Communications Management Office (CMO) duties may be assigned to an NSC associated with one end of the circuit. The NSC will maintain a file of correspondence for these circuits. This information is essential for fulfillment of NSC responsibilities and will be promulgated as a part of the TSO. (5) The NSC should retain up-to-date node configuration documentation. This documentation will normally consist of the original site activation TSR/TSO and the Initial Installation Plan (IIP) used by the installing contractor. A copy of the IIP should be given to the NSC during node activation. The NSC should also retain all records of changes made to the node. Change documentation will normally consist of new TSR/TSOs. The NSC will coordinate such changes with the level II NMC in order to help ensure that master node configuration records match those at the site. 2-4. Node Site Survey Assistance Responsibilities. DISN node site surveys are conducted by the one or more offices within DISA or by the Services. These surveys will require support from the host base. This support will represent the first contact on the part of the NSC with the various parties Page 8 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes involved with set-up, test, and operations of the DISN node. Therefore: a. The S/A shall designate a point of contact (POC) for the site survey. This POC may be the NSC. b. Prior to the site survey, the POC should arrange for conference room space for use by the survey team. The POC should also ensure that all local organizations affected by the installation and operational requirements for the node site attend the site survey. As a minimum, this includes the node site hosting organization and local telecommunications personnel and the NSC if different from the POC. c. The POC should coordinate local assistance as required to successfully complete the site survey. This may include arranging for appropriate typing or word processing support to complete the site survey concurrence documents. The concurrence documentation should be signed by all participating parties, including the S/A. 2-5. Node and Circuit Installation Assistance Responsibilities. a. To facilitate implementation of the DISN node, interswitch trunk circuits, and user access to the DISN, the NSC will be responsible for coordinating and assisting with the installation and activation of node hardware, software, and circuitry. NSC responsibilities relative to installation are summarized in the following paragraphs. Additional technical guidance is provided in chapter 3 of this Supplement. b. The NSC may assist DISA in monitoring the work of government personnel, operations and maintenance (O&M) command, DISN contractors, and other commercial vendors supporting the DISN. The NSC will notify the DISA Area Network Manager or Contracting Officer's representative (COR) via electronic mail (E-Mail) or front-channel message whenever government personnel or contractor work performance problems are observed or when the NSC suggests improvements for the DISN node site. As part of this responsibility, the NSC should maintain a log of all installation and maintenance activities at the node site (see paragraph 2-5d below). c. Upon receipt of a TSR/TSO, the NSC should be contacted by the Communications Control Office (CCO) to ensure that the NSC is aware of the TSR/TSO and the actions required. d. The NSC should assist commercial vendors or government E&I teams as follows: Page 9 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes (1) Identifying the locations within the node cabinets to install equipment, (2) Assisting the personnel responsible for completing the circuit between the commercial vendor and the base main distribution frame (MDF) and the DISN intermediate distribution frame (IDF), or to the node. (3) Assisting in identifying the cross-connect points as appropriate, the circuit wire pairs, and the DISN-installed cabling required to complete an interswitch trunk or access circuit as ordered. e. When requested by DISA, NMC personnel, or supporting installation management contractors, the NSC should provide node site status on equipment and circuits still in the process of being installed or implemented. 2-6. Electronic Mail (E-Mail) Capability. The NSC should obtain an electronic mail capability through the supporting service component to effectively perform the functions required. 2-7. Node Relocations. Periodically there is a requirement to relocate communications and automated data processing equipment to accommodate changes and expansions at the local level. Due to the increasing reliance on DISN by operational systems and in order to schedule DISN relocation resources, policies and procedures have been developed. It is imperative to follow these procedures as outlined below. a. Advance notice of a proposed DISN relocation is required to properly plan, schedule, survey, and accomplish the relocation. Notice should be provided by the local command or agency via formal message to DISN level II (Westhem), DISA-EUR Code DED (Europe), or DISA-PAC Code DPD (Pacific) with information copy to all intermediate service telecommunications and engineering and installation commands. The message should contain, as a minimum, the following information: (1) Network, node name, and node number. (2) Node Site Coordinator. (Name, telephone number, and electronic mail address.) (3) Current node physical location. (Building, room, address.) Page 10 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes (4) Proposed node physical location. (Building, room, address.) (5) Date relocation must be completed. (6) Reason relocation required. (Include impact if not accomplished and any other information relevant to the relocation.). (7) Telecommunications service actions. (Explain, in detail, all circuit actions required). (8) Proposed schedule for cutover at the new site. b. Lack of adequate lead time may necessitate deinstallation and storage of the DISN node equipment until reinstallation actions can be scheduled and accomplished. A fast response or "expedite" process may be required for very short lead time relocation requests. This process may be accomplished by formal correspondence (message or letter) and will be based on the complexity of the proposed relocation and required TSR and TSO lead times as established in DISA Circular 310-130-1, "Submission of TSR's." For example, a shorter lead time may be possible if all actions (except for the actual deinstallation and reinstallation of the DISN provided node equipment) can be accomplished by the local command or agency and only "for record purposes TSR's" are required. c. AT NO TIME IS THE SITE AUTHORIZED TO MOVE DISN EQUIPMENT WITHOUT DISA APPROVAL. Normally, a site survey will be accomplished and relocations performed with DISA, service and local command participation. d. All organizations supporting DISN node sites are reminded that a node relocation will require a DISN node outage with various degrees of user and DISN mission impact. For example, the removal of one node may result in single thread connectivity for other nodes. Therefore, the subsequent outage of an interswitch trunk circuit or node may isolate several other nodes and all associated host connections. This potential situation underscores the need for NSC coordination with the level II NMC so as to minimize the impact of system disruption. e. NSC personnel should be able, after training or help from the government O&M team and with assistance from the NMC, to recognize what is considered to be normal operating conditions for the DISN node equipment. The NSC should report any ABNORMAL conditions to the level II NMC. Page 11 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes CHAPTER 3. NODE SITE ARCHITECTURE 3-1. Overview. This chapter discusses node site equipment components and their configuration into standard nodes. It also covers procedures and restrictions on relocating node equipment. Table 3-1 Router Node Site Equipment Equipment Description Capability Cisco Router or Cisco may use CSC3 Up to 32 Equivalent CSC4 processor Interfaces ADC Digital Patch Panel 16 RS-530 Patches Converter* Line Conditioner Various Pulse Model 3023 Crypto Housing Adapts KG-194 KG-194 Encryptor High Rate Crypto KG-84 Encryptor Rates ó 64K Larse T-1500 DSU Shelf Up to 16 T1 DSUs Codex 3500 Multiple CSU/DSUs "Low" Rate DSUs MPC-2* Protocol Converter Various *Converter and Line Amplifier type will depend on the specific application. 3-2. Rack elevation drawings for DISN "standard" nodes are included in this chapter. Each node will differ somewhat from every other node. The difference will be in the number and type of circuits, hosts, and networks terminated. This difference in these requirements will in turn affect the exact type of modules used with the router and will also often require the use of modems, CSU/DSU, and multiplexer equipment. Figure 3-1 illustrates a "typical" DISN router node. This node has a "footprint" of 66 inches across the front by 31 inches deep. A clear space of at least 24 inches behind the cabinets is required for clearance when opening the doors. The assembly is approximately 78 inches high. Each cabinet has approximately 70 inches of usable panel height. Free space shown in the typical Page 12 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes node is intended for future expansion or modification of the node. [Figure 3-1 Omitted] 3-3. Equipment Description. Refer to figure 3-1. The Standard Node depicted in figure 3-1 consists of three cabinets labeled "Processor", "Encryption", and "Communications." a. Processor Cabinet. This cabinet contains the equipment needed to provide SUBSCRIBER connections. In most cases the subscriber will be connected via a local base circuit. For example, a subscriber's ethernet LAN may be connected to one of the ethernet ports on the Cisco. Often the local base circuit will need to be "conditioned" so as to meet the DISN requirements. Presently available line amplifiers can overcome difficulties with old, lossy cable even at relatively high data rates. There is no "typical" subscriber service. Each connection can be expected to be different. 1) The most significant equipment item in the processor cabinet is the router. Its configuration is determined by the number and type of appliques installed in it and its software operating system. An AGS+ can accommodate up to 32 individual interfaces and will be configured with either a CSC3 or CSC4 processor. Current software is the 8.X version; future plans are to convert to 9.X. In some applications a Cisco model 7000 or Wellfleet router will be used in place of the AGS+. These models are similar but feature a higher backplane speed. This feature enables the router to exploit high speed serial technology such as fiber optic digital interfaces. The router needs to be programmed before it can be operated. The programming is referred to as "configuration." Configuration consists of providing operating parameters and instructions to each of the interface ports. Configuration may be accomplished by connecting a terminal to the router and entering the configuration commands through the terminal. Configuration data may also be downloaded from another router. Configuration will normally be done by the installer or remotely by the level II NMC. The routers are capable of storing more than one configuration and the storage is non-volatile so that it will not be erased at power failure. A router's configuration cannot be Page 13 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes changed without knowing two passwords. The level II network management centers will normally be the only entities having access to both passwords. 2) Just below the router is a patch panel. This patch panel, usually an ADC product, can accommodate up to 18 sets of DB-25 connectors, wired for the RS-530 physical standard. Each set has three individual connectors. The upper connector in a set is labeled "component." It will normally go to a port on the router. The middle connector in a set is marked "modem." It is connected to a local subscriber circuit; if necessary the circuit passes through a modem, amplifier, or line conditioner located further down in the cabinet. The common practice is to wire the connectors such that patch cords are not used except during troubleshooting or to "patch around" a faulty piece of equipment. The bottom of the three connectors in a set is used for monitoring purposes. It is appropriately marked "monitor." 3) The converter cages shown in the bottom of this cabinet contain the line amplifiers, modems or line conditioners mentioned above. A number of different types of equipment can be present. b. Encryption Rack. The DISN security architecture requires certain portions of the router networks to be encrypted. For example, unclassified router circuits which leave the confines of a base may need to be encrypted. Node control gateways may be encrypted to preclude unauthorized access. The DISN nodes use two types of encryption equipment: KG-194 is used for high speed and KG-84 is used for lower speeds. The encryption equipment is placed BETWEEN the secure and non secure portions of the network. At a DISN router node, the subscriber side of the circuit will be unencrypted. The logical flow is from left to right from the processor rack, through the encryption device to the communications rack on the right. The encryption device provides encryption for the communications leaving the base. Note that subscriber to subscriber communications, which passes across the router but does not leave the base, remains unencrypted. Note also that ENCRYPTION GEAR MAY NOT BE INSTALLED. In some situations the DISN security requirements may be met without the need to encrypt the signals passing through the router node. When this is the case, SPECIAL CABLES ARE USED to provide the needed interconnections within the cabinet. 1) The KG-194A is used to encrypt circuits with speeds of >64 Kb/sec up to E-1 speeds or 2.048 Mb/sec. It is Page 14 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes installed in a Pulse Engineering Model 3023 crypto housing. The model 3023 enables rack mounting of the crypto; it has a built in power supply and RS-530 interfaces. 2) The KG-84 is used at speeds of 64 Kb/sec and below. c. Communications Rack. Signals which are leaving the DISN node or are arriving from a distant node are processed by equipment in the communications rack. 1) The Larse model Access-T 1500 DSU chassis is usually placed in the top of this rack. It holds up to 15 DSU/CSU modules per chassis. Individual DSU modules plugged into the chassis can be used to terminate circuits with data rates in DS0 increments (n x 56 or 64 Kb/s) up to a full T-1. 2) A digital patch panel is included in this rack. Its function is to allow testing and equipment substitution when troubleshooting. It is the same as the unit described in paragraph a.2) above. 3) A model MPC-2 (or equivalent) signal converter is installed in the communications rack. Its function is to convert signals from commercial standards such as V.35, RS-442/3 or RS-449 to The DISN standard RS-530. 4) A Codex model 3500 DSU cage may be installed. This item is used to house modem modules for low data rate applications. The 3500 modems are remotely manageable and may be used when the network operations center needs to manage the CIRCUIT as well as the node equipment. 4. Power. The router equipment uses conventional 120V, 50/60 Hz electrical power. The DISN node is part of a large network. Therefore electrical power supplied to the router node equipment should be uninterruptible whenever such power is available. The DISN standard node does not include an uninterruptible power source (UPS); therefore UPS availability should be considered a critical factor when choosing the node's physical location. The node equipment will consume up to 3000 watts and produce up to 12,700 BTU of heat load. The NSC should consult site specific documentation during the site survey to obtain exact figures. Page 15 Supplement II to DISAC 310-70-X Node Site Coordinators Guide, DISN Router Nodes 5. Router Node Site Removal or Relocation. Router node site equipment is designed to operate continuously. A DISN node's continued operation is vital to the "health" of the network. It must not be powered down, removed, or relocated without prior coordination with Headquarters DISA or the Area Level II. In situations where the node MUST be relocated, e.g. base closure, building renovation, etc., the NSC must provide as much advance notice as possible. See also Chapter 2, paragraph 2-7. Page 16