Mitel SX 200 ML PABX Instructions Guide
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8 Loss and Level Plan General 8.1 This part describes the loss and level plan for North American applications. A large number of interconnections are possible, ranging from interconnections between on-premises (ONS) line circuits, to the interconnection of remotely located satellite PABXs with this PABX. This part describes the principles of the loss and level plans, their application to the PABX, and the arrangements for setting the transmission levels. North American Loss and Level Plans 8.2 The purpose of a transmission loss and level plan is to provide an acceptable transmission grade of service to all subscribers in the telephone network. At present, two loss plans exist for the public switched network in North America. They are the VIA NET LOSS (VNL) plan and the SWITCHED DIGITAL NETWORK (SDN) plan. VNL Plan The VNL plan consists of two parts: a fixed loss portion and a variable loss portion as follows: l Fixed Portion. A minimum fixed amount of loss is introduced into all Toll con- nections. This loss is equal to 5 dB and is split equally between the two end trunks connected to the Toll network. 0 Variable Portion. In addition to the fixed portion, a variable loss is introduced into all trunks involved in a connection. This loss, known as VNL, is proportional to the trunk length and its propagation delay. The loss ranges from a minimum of 0.5 dB to a maximum of 3.0 dB, and covers trunk lengths from 0 to about 2900 km (0 to 1800 miles). Trunks in excess of this length employ echo suppressors and are designed to zero loss. The loss objectives for Toll connections that use the VNL plan range from a minimum of 5.5 dB to a maximum of 8.0 dB between end-to-end CO offices (CL5 to CL5), as illustrated in Table 8-2. SDN Loss Plan The Switched Digital Network (SDN) loss plan was developed to meet the needs of the evolving digital public switched network. This plan does not assign losses to inter- mediate links in a connection. Under the plan, the local area public network (local CO to local CO) is operated at zero loss. This feature eliminates the need to introduce digital padding on intermediate digital trunk links and maintains data transparency throughout the network. Control of echo and noise with this plan is achieved by inserting fixed amounts of loss at the end points where the conversion to analog takes place. A compromise value of 6 dB was selected for line-to-line connections over the Toll net- work. This loss is inserted in the receive (RX) direction of transmission (D-A) under software control. This is illustrated in Figure 8-2. March 1997 Issue 1 Revision 0 8-l
Engineering Information LOCAL TOLL (OR HIGHER) TOLL (OR MGHER) LOCAL co OFFICE OFFICE co TOLL-CONNECTING INTER TOLL TRUNKS TOLL-CONNECTING TRUNK (2W ANALOG) TRUNK (2W ANALOG) cc0100 Figure 8-l Local to Local Central Offices VNL Objectives LOCAL LOCAL co Figure 8-2 Local to Local Central Offices Fixed Loss Plan Objectives Loss And Level Plan The loss and level plan used for the PABX is illustrated in Figure 8-3. This layout is not intended to be a typical network, but is drawn to show the different types of trunk and line interfaces which the PABX will accommodate. 8-2 Issue 1 Revision 0 March 1997
Loss and Level Plan Table 8-i explains the terms used for the different types of peripheral interfaces. Circuit Ref ONS ONS(D) OPSS OPSL AC0 ACO(D) ACO( D) AT0 ATO ATO ATT Dl-r Tl Trunk Cll- sAlT This designation refers to a “satellite” tie trunk which connects a Main PBX sD-i-r to a Satellite PBX. The type of trunk cards used to interface are the same scn- as those for the AlT, DTT, and ClT interfaces described above. Table 8-l Interface References Description Card Type (Part No.) An industry-standard telephone set may be connected to the PABX by means of the following card types: ONS Line Card 9109-010 An industry-standard telephone set located off premises may be connected 9109-020 via the OPS Line Card. An industry-standard telephone set located outside the range of the ONS 9109-020 circuit (over 2 kilometers) may be connected to the PABX via the OPS Line Card. An Analog CO (ACO) trunk can be connected to the PABX by means of one of the following types of trunk interface cards: LS/GS Trunk Card 9109-011 DID Trunk Card 9109-031 An Analog Toll Office (ATO) trunk may be connected to the PABX by means of one of the following trunk interface cards: LWGS Trunk Card 9109-011 E&M Trunk Module 9109-013 An Analog Tie Trun k (AlT) can be connected between this PABX and another PBX, over a 2- or 4-wire analog trunk by means of one of the following trunk cards: E&M Trunk Module DID Trunk Card . 9109-013 9109-031 A Digital Ceniral Office Trunk (DCO) connects a Digital CL5 office over digital facilities. A Digital Toll Office Trunk (DTO) connects a Digital PABX to a Digital CL4 or higher office over digital facilities. A Digital Tie Trunk (Dl’T) connects a Digital PABX to a Digital PABX over digital facilities. Digital Tl Trunk Card. 9109-021 A Combination Tie Trunkconnects a Digital PABX to a remote channel bank over digital facilities. The remote channel bank usually interfaces to an analog PBX and provides the A/D & D/A conversion. To implement the required loss objectives (Table 8-2) of the plan, combinations of fixed and software selectable analog and digital transmission pads are provided. All analog padding is provided by Mite1 8960 series combined Codec/Filter integrated circuits, over a 7 dB range in I dB increments. Padding is provided in both the Transmit (TX) and Receive (RX) directions (see Part C). March 1997 Issue 1 Revision 0 8-3
Engineering Information Satellite PABX 8-4 A satellite PABX (shown in Figure 8-3) is defined as a PABX which has no direct connection to the serving central office for incoming traffic. It has no directory number, and receives all incoming calls through the main PABX over satellite trunks. The sat- ellite PABX is usually in the same local area as its main PABX. Note that the Loss Plan differs for SATELLITE” trunks in the main PABX from “SATELLITE” trunks in the satellite PABX. Analog Transmission Pad Arrangements - Digital Interfaces The analog transmit pad (A/D) setting defines the input level required to produce a 0 dBm0 digital signal, as well as the overload point of the interface (approximately 3 dB above the 0 dBm0 signal level), The TX pad comprises a fixed portion and a variable portion. The fixed portion is incorporated into the analog interface to the codec/filter. The variable portion (0 to 7 dB) is incorporated into the codec/filter. The analog receive pad (D/A) defines the output level produced by a digital milliwatt input signal. The Rx pad comprises a fixed portion which is part of the analog interface to the codec/filter, and a variable portion (0 to -7 dB) which is incorporated into the codec/filter. This pad arrangement is illustrated in Figure 8-4. Issue 1 Revision 0 March 1997
Loss and Level Plan ONS OPS SSA TOLL sx-200 MAIN PABX SAi7 - OFFICE - ONS SAlT cc0097 ONS 4 Ops+ S;L22E 1 ss4 ATN March 1997 Figure 8-3 Types of Trunk and Line interfaces Issue 1 Revision 0 8-5
Engineering Information Table 8-2 PABX Loss Plan Originating Circuit Connecting Circuit Loss (dB) TX Loss (dB) Rx Direction Direction ONS(D) -6.0 -6.0 ONS(D) OPSS -6.0 -6.0 OPSL -3.0 -3.0 ACO( D) 0 0 AT-WI -3.0 -3.0 ATO -6.0 -6.0 DC0 -3.0 -3.0 DTO -3.0 -9.0 D-I-T -3.0 -9.0 SAlT -3.0 -3.0 sDll- -3.0 -3.0 SCl-T -3.0 -9.0 ONS(D) -6.0 -6.0 OPSS OPSS -6.0 -6.0 OPSL -3.0 -3.0 ACO(D) 0 0 AT-W) -3.0 -3.0 ATO( D) -6.0 -6.0 DC0 -3 -3 DTO -3 -9 sA-i-r -3.0 -3.0 SC-I-T -3.0 -9.0 sDl-r -3 -3 ONS(D) -3.0 -3.0 OPSL OPSL 0 0 OPSS -3.0 -3.0 ACO( D) 0 0 AT-WI -2.0 -2.0 ATO( D) -3.0 -3.0 DC0 0 0 DTO 0 -6 D-I-T 0 -6 sAl-r -2.0 -2.0 sDTT -2 -2 scl-r 0 -6 Page 1 of L 8-4 Issue 1 Revision 0 March 1997
Loss and Level Plan Table 8-2 PABX Loss Plan (continued) Originating Circuit Connecting Circuit Loss (ciB) TX Loss (ciB) Rx Direction Direction ONS(D) 0 0 ACO(D) OPSS 0 0 OPSL 0 0 ACO( D) 0 0 ~J--W~ -2.0 -2.0 ATO( D) -3.0 -3.0 DC0 0 0 DTO 0 -6 D-l-r 0 -6 SAT 0 0 SD-IT 0 0 S3-r 3 -3 ONS(D) -0.2 -0.2 ONS(D) -3.0 -3.0 AT-W) OPSS -3.0 -3.0 OPSL -2.0 -2.0 A-WW 0 0 DC0 -2 -2 DTO 3 -3 D-l-r 3 -3 sATT 0 0 ACO(D) -2.0 -2.0 ATO( D) 0 0 SD-I-~ 01-2 o/-2 SCTT 3 -3 ONS(D) -6.0 -6.0 ATO( D) OPSS -6.0 -6.0 OPSL -3.0 -3.0 ACO( D) -3.0 -3.0 ATU 0 0 ATO( D) 0 0 DC0 -3 -3 DTO 3 -3 DV 3 -3 sAl-r -3.0 -3.0 SD-~-F -3 -3 SC-l-r 3 -3 Page 2 of 4 March 1997 Issue 1 Revision 0 a-7
Engineering Information Table 8-2 PABX Loss Plan (continued) Originating Circuit Connecting Circuit Loss (dB) TX Loss (dB) Rx Direction Direction ONS(D) -3.0 -3.0 s ATT OPSS -3.0 -3.0 OPSL -2.0 -2.0 ACO(D) 0 0 ~-WY 0 0 ATO( D) -3.0 -3.0 DC0 0 0 DTO 0 -6 D-i-r 0 -6 . SATT 0 0 sDl-r 0 0 SC-l-r 0 -6 ONS(D) -3 -3 DC0 OPSS -3 -3 OPSL 0 0 ACO(D) 0 0 AT-W) -2 -2 ATO( D) -3 -3 DC0 0 0 DTO 0 -6 D-t-r 0 -6 sAl-r 0 0 sDTT 0 0 SCTT 0 -6 ONS(D) -9 -3 DTO OPSS -9 -3 OPSL -6 0 ACO(D) -6 0 AT-W) -3 3 ATO( D) -3 3 DC0 -6 0 DTO 0 0 D-I-T 0 0 sAlT -6 0 SD-IT -6 0 scl-r 0 0 Page 3 of 4 8-8 Issue 1 Revision 0 March 1997
Loss and Level Plan Table 8-2 PABX Loss Plan (continued) Originating Circuit Connecting Circuit Loss (dB) TX Loss (dB) Rx Direction Direction ONS(D) -9 -3 DTT OP.% -9 -3 OPSL -6 0 ACO(D) -6 0 AT-W) -3 3 ATO( D) -3 3 DC0 -6 0 DTO 0 0 DTO 0 0 D-IT 0 0 sATI- -6 0 sDTT -6 0 SCTT 0 0 ONS(D) -9 -3 scll- OPSS -9 -3 OPSL -6 0 ACO( D) -3 3 AJ-UW -3 3 ATO( D) -3 3 DC0 -6 0 DTO 0 0 DTO 0 0 Dll- 0 0 sA-i-r -6 0 SD-IT -6 0 SC-l-r 0 0 ONS(D) -3 -3 SD-I-T OPSS -3 -3 OPSL -2 -2 ACO(D) 0 0 AJ-UW 01-2 01-2 ATO( D) -3 -3 DC0 0 0 DTO 0 -6 D-i-r 0 -6 sATT 0 0 sDTT 0 0 SC-i-r 0 -6 Page 4 of 4 March 1997 Issue 1 Revision 0 8-9
Engineering Information AID CONV. e FIXED q VARIABLE - sx-200 VARIABLE - PABX , CIRCUIT N CONNECTING TIP/RING CIRCUIT D/A CONV. FIXED - VARIABLE - SWITCHING VARIABLE - NETWoRK - cc0099 Figure 8-4 Analog Pad Arrangements - Configuration A Conferencing Loss Plan 8.3 Any system will have at least one 18-port conference circuit (Digital Signal Processor). The conferencing circuit, on a frame-by-frame basis, compares the level of all conferees and sends the loudest signal to all other parties in the conference. The party which is the loudest receives audio from the second loudest party. The conference loss plan is outlined in Table 8-3. Table 8-3 Conferencing Loss Plan Originating Circuit ONS(D) Connecting Circuit Loss (dB) TX Direction Loss (dB) Rx Direction ONS(D) -6.0 -6.0 OPSS -6.0 -6.0 OPSL -3.0 -3.0 ACO(D) -4.0 -4.0 AT-W) -5.0 -5.0 ATO( D) -6.0 -6.0 DC0 -3.0 -3.0 DTO -3.0 -9.0 Page 1 of 5 Issue 1 Revision 0 March 1997