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				<h1 class="basic-info-header-docno inline-block">TIA-4957.210</h1>
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		<span>Revision A, April 18, 2017</span>
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				<h1 class="doc-title">Multi-Hop Sublayer Specification-Extension on Field Area Networks</h1>
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	<h1 id="product-details-list" class="upsell-header">Product Details:</h1>
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		<li>
			<strong>Revision:</strong>
			
		<span>Revision A, April 18, 2017</span>
		</li>
		<li>
			<strong>Published Date:</strong>
			April 18, 2017
		</li>
		<li>
			<strong>Status:</strong>
			Active, Most Current
		</li>

		
		<li>
			<strong>Document Language:</strong>
			
			
			English
		</li>
		
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				<strong>Published By:</strong>
				<a href="https://global.ihs.com/standards.cfm?publisher=TIA&csf=TIA">
					Telecommunications Industry Association (TIA)
				</a>
			</li>
		
		<li>
			<strong>Page Count:</strong>
			60
		</li>
		 <li>
			<strong>ANSI Approved:</strong>
			
				Yes
			
		</li>
		<li>
			<strong>DoD Adopted:</strong>
			
				No
			
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	<h1 id="abstract-section" class="upsell-header">Description / Abstract:</h1>
	
	<div class="abstract-section">
	
	<strong>Scope and Purpose</strong> <br><br>This document defines a Forwarding sub-layer protocol and a Routing sub-layer protocol for the Data Link layer of TR51, including processes, functions, service interfaces and externally visible frame formats. The Forwarding protocol provides data transfer services between non neighboring devices. The Routing protocol provides discovery and maintenance of multi-hop routes between certain non-neighboring devices.
	 
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					Copyright (c) 2018 IHS Markit Inc.  All Rights Reserved.
				</div>
		</div>
	</div>
</div>

		
	<script>
		/* From page_header_scripts_include.cfm */
		
		TagManager = {
			addToCart: function(productstring) {},
			removeFromCart: function(productstring) {}
		};
		
		window.name="_Global";
		
		var TimeToFade = 1000.0;
	
		function fade(eid){
			var element = document.getElementById(eid);
			if(element == null) return;
		
			if(element.FadeState == null){
				if(element.style.opacity == null || element.style.opacity == '' || element.style.opacity == '1')
					element.FadeState = 2;
			    else
					element.FadeState = -2;
			}
		
			if(element.FadeState == 1 || element.FadeState == -1){
			    element.FadeState = element.FadeState == 1 ? -1 : 1;
			    element.FadeTimeLeft = TimeToFade - element.FadeTimeLeft;
			}else{
			    element.FadeState = element.FadeState == 2 ? -1 : 1;
			    element.FadeTimeLeft = TimeToFade;
			    setTimeout("animateFade(" + new Date().getTime() + ",'" + eid + "')", 33);
			}
		}
	
		function animateFade(lastTick, eid){
			var curTick = new Date().getTime();
			var elapsedTicks = curTick - lastTick;
			var element = document.getElementById(eid);
		
			if(element.FadeTimeLeft <= elapsedTicks){
			    element.style.opacity = element.FadeState == 1 ? '1' : '0';
			    element.style.filter = 'alpha(opacity = ' + (element.FadeState == 1 ? '100' : '0') + ')';
			    element.FadeState = element.FadeState == 1 ? 2 : -2;
			    return;
			}
		
			element.FadeTimeLeft -= elapsedTicks;
			var newOpVal = element.FadeTimeLeft/TimeToFade;
			if(element.FadeState == 1) newOpVal = 1 - newOpVal;
		
			element.style.opacity = newOpVal;
			element.style.filter = 'alpha(opacity = ' + (newOpVal*100) + ')';
			setTimeout("animateFade(" + curTick + ",'" + eid + "')", 33);
		}
		
		
		function fn_submit_cart(){
			document.shopping_form_include.action = 'https://global.ihs.com/doc_detail.cfm?input_doc_number=TIA\x2D4940&input_doc_title=&item_s_key=00601800&FORCEAPPLICATIONREFRESH=0&item_key_date=820531&csf=TIA&cart_action=update';
			document.shopping_form_include.submit();
		}
	
		function fn_set_index(item_index,  discount){
			if(discount.indexOf("H") > -1 || discount.indexOf("B") > -1){
				var prev_index = item_index - 1;
				document.shopping_form_include.hdn_update_index.value = prev_index + "," + item_index;
			}else{
				document.shopping_form_include.hdn_update_index.value = item_index;
			}
			fn_submit_cart();
		}
	
		function fn_set_qty(item_index, discount){
			if(discount.indexOf("H") > -1 || discount.indexOf("B") > -1){
				var prev_index = item_index - 1;
				document.shopping_form_include.hdn_update_index.value = prev_index + "," + item_index;
			}else{
				document.shopping_form_include.hdn_update_index.value = item_index;
			}
	
			var a = eval("document.shopping_form_include.document_quantity_input" + item_index);
			a.value = 0;
			fn_submit_cart();
		}
		
		/* active_cart_include.cfm */
		
		function isNumber(evt){
		    evt = (evt) ? evt : window.event;
		    var charCode = (evt.which) ? evt.which : evt.keyCode;
		    if(charCode > 31 && (charCode < 48 || charCode > 57)){
		        return false;
		    } else if(charCode==13){
				return false;
			}
		
		    return true;
		}
		
		function fn_check_active(j,qty,total_items){
			var a=eval("document.shopping_form_include.document_quantity_input"+j);
			if (((a.value) == qty) || (a.value)=="") {
				document.getElementById('update_qty'+j).style.display = "none";
				document.getElementById('delete_qty'+j).style.display = "none";
			} else if ((a.value) > 0) {
				document.getElementById('update_qty'+j).style.display = "";
				document.getElementById('delete_qty'+j).style.display = "none";
			} else if ((a.value) == 0) {
				document.getElementById('update_qty'+j).style.display = "none";
				document.getElementById('delete_qty'+j).style.display = "";
			}
		
			var update_cart_flag = 0;
			for (var i=1;i<=total_items;i++){
				if (document.getElementById('update_qty'+i) != null){
					if ((document.getElementById('update_qty'+i).style.display == "") || (document.getElementById('delete_qty'+i).style.display == "")){
						update_cart_flag = update_cart_flag + 1;
					}
				}
			}
			if (update_cart_flag >=2){
				document.getElementById('update_cart').style.display = "";
			} else {
				document.getElementById('update_cart').style.display = "none";
			}
		}
		
		function fn_check_qty(j,qty){
			var a=eval("document.shopping_form_include.document_quantity_input"+j);
			if((a.value) == ""){
				a.value = qty;
			}
		}
	
	</script>


	<script type="text/javascript" src="/js/jquery-1.11.0.min.js"></script>
	<script type="text/javascript" src="/js/jquery-ui.min.js"></script>


<script TYPE="text/javascript">
	var $j = $;
	
	$(document).ready(function() {
		var delay=500;
		var timeout;
		
		$('.dropdown').hover(function(e) {
			var obj = $(this);
			obj.children("a").addClass("hover");
		    timeout = setTimeout(function() {
				obj.find(".dropdown-menu").show();
		    }, delay);
		}, function(e) {
			var obj = $(this);

			//check to see if current hover element is (hasAncestor) of dropdown
			if (e.target.className != 'price-label-multiuser-dropdown') {
			    clearTimeout(timeout);
			    obj.find(".dropdown-menu").hide();
				obj.children("a").removeClass("hover");
			}
		});


		$('.masthead-browse-menu-submenu-item-with-menu').hover(function() {
			var obj = $(this);

			obj.parent().siblings(".masthead-browse-menu-submenu-container").hide();
			obj.parent().siblings("#" + obj.attr("id") + "-options").show();

			obj.siblings().removeClass("hover");
			obj.addClass("hover");

		});

		$("#search-bar-searchbox").on("blur", function(e) {
		  	if (document.form_header.input_doc_number.value == "") {
				document.form_header.input_doc_number.value="";
		  		document.getElementById('search-bar-searchbox').className = '';
			}
		});

		$("#search-bar-searchbox").on("focus", function(e) {
		  	if (document.form_header.input_doc_number.value == "") {
		  		document.form_header.input_doc_number.value="";
		  		document.getElementById('search-bar-searchbox').className = 'search-bar-searchbox-query-text';
			}
		});

		$('#search-bar-publishers-select').chosen();

	});
	
</script>

<script type="text/javascript">
	function updateShoppingCartMenu(cart) {
		$("#tblShoppingCart tr.dynamic-row").remove();
		$("#trHeaderSeparator").after(cart);
		$("#tblShoppingCartEmpty").hide();
		$("#tblShoppingCart").show();
		$("#cartTotalQuantity").text($("#hdnCartTotalQuantity").val());
	}
</script>

<script src="js-image-slider.js" type="text/javascript"></script>
<script type="text/javascript" src="/js/jquery.placeholder.min.js"></script>
<script type="text/javascript" src="/js/autofill-event.js"></script>
<script type="text/javascript" src="/js/util.js?version=#request.releaseVersion#"></script>
<script src="chosen.jquery.min.js" type="text/javascript"></script>
<script type="text/javascript" src="jquery.ie-select-width.min.js"></script>


    	<script>
    		$("#documentImage").dialog({
				height:600, width:634, modal:false, autoOpen:false,
				dialogClass: "noTitleStuff",
				show: { effect: "fade", duration: 200 },
				hide: { effect: "fade", duration: 200 },
				modal: true,
				draggable: false,
				resizable: false,
				open: function() {setTimeout(enableAbsolute, 250)},
				close: function() {$(".ui-dialog").toggleClass("absolute-position", false)},
				buttons: [
					{
						text: "Close",
						"class": "dialogCloseButton",
						click: function() {
							$( this ).dialog( "close" );
							$(".ui-dialog").toggleClass("absolute-position", false);
						}
					}
				]
			});
			
			function enableAbsolute() {
				$(".ui-dialog").toggleClass("absolute-position", true)
			}
			
			$(".image-container").on('click', 'img', function() {
	        	$("#documentImage").dialog("open");
	    	});
	    	
	    	$("#documentImage").css("display", "table-cell");
	
			var $loader = getAjaxLoader();
	
			/*
				PreviewContentFactory: currently only PDF previews are expected but as per reqirements other formats may come into play in the future 
			*/
			var PreviewContentFactory = function(){}
	
			PreviewContentFactory.prototype = {
				render: function(type){
					var globalID = $('input[name=globalid]').val();
					switch(type.toLowerCase()){
						case 'pdf':
	
							if($('.btn-doc-preview').hasClass('manual-preview')){
								try{
									var pid = $('.btn-doc-preview').attr('data-id');
									var content = '';
									if(pid){
										content = '<iframe title=\'' + $('.basic-info-header-docno').text() + '\' frameborder=\'0\' src=\'preview.cfm?k=' + pid + '&m=1\' width=\'1150\' height=\'550\'></iframe>'
									}else{
										content = 'Preview id is undefined';
									}
									$('.doc-preview-dialog .ui-dialog-content').html(content);
								}catch(e){
									$('.doc-preview-dialog .ui-dialog-content').html(e.message);
								}
							}else{
								$.ajax({
									type: 'POST',
									url : 'https://global.ihs.com/ajax_proxy.cfm?method=cfc.document.Ajax.getDocumentPreview&returnformat=json',
									data : { 
										pref: 'previewtndcagaaaaaaaaaa00601800820531',
										globalid: globalID
									},
									beforeSend: function(xhr, settings){
										$('.doc-preview-dialog .ui-dialog-content').html($loader);
									},
									success: function(response, status, xhr){
										// console.log(response);
										try{
											var content = '';
											if(response.key){
												content = '<iframe title=\'' + $('.basic-info-header-docno').text() + '\' frameborder=\'0\' src=\'preview.cfm?k=' + response.key + '\' width=\'1150\' height=\'550\'></iframe>'
											}else{
												content = response.message;
											}
											$('.doc-preview-dialog .ui-dialog-content').html(content);
										}catch(e){
											$('.doc-preview-dialog .ui-dialog-content').html(e.message);
											// console.log(e.message);
										}
									},
									error: function(xhr, status, error){
										$('.doc-preview-dialog .ui-dialog-content').html(error);
										// console.log(error);
									}
								});
							}
							break;
						default:
							break;
					}
					// console.log('PreviewContentFactory:render()');
				}
			}
	
	
			$('.btn-doc-preview').on('click', function(event){
	
				var buttons = [
					{
						'text' 	: 'Close',
						'class' : 'doc-preview-x-btn',
						'click' : function(){
							$(this).dialog('destroy');
						}
					}
					/*{
						'text' 	: 'Download',
						'class' : 'doc-preview-download-btn',
						'click' : function(){
							$(this).dialog('destroy');
						}
					}*/
				];
	
	
				var content = $('#document-preview-dialog-tmpl').html();
	
				$('<div/>').html(content).dialog({
					'title' 		: $('.basic-info-header-docno').text(),
					'width' 		: 1200,
					'height' 		: 750,
					'autoOpen' 		: false,
					'dialogClass' 	: 'doc-preview-dialog global-dialog no-close',
					'show' 			: { 'effect' : 'fade', 'duration' : 200 },
					'hide' 			: { 'effect' : 'fade', 'duration' : 200 },
					'modal' 		: true,
					'draggable' 	: true,
					'resizable' 	: false,
					'buttons' 		: buttons,
					'closeOnEscape' : false,
					'show'			: { effect: "fade", duration: 200 },
					'hide'			: { effect: "fade", duration: 200 },
					'open' 			: function(event, ui){
						var factory = new PreviewContentFactory();
						
						factory.render('pdf');
					}
				}).dialog('open');
	
			});
		</script>
    

<style>
    #splash {
        position:fixed;
        top: 100px;
        left: 400px;
        height: 80px;
		width:500px;
        background:#F3F3F3;
		border:#666666 1px solid;
		font-family:Arial;
		font-size:14px;
		font-weight:bold;
		vertical-align:middle;
		text-align:center;
		color: #666666;
		border-radius: 15px;
		z-index:100000;
    }
</style>
		
		
			<script language="JavaScript" type="text/javascript">
				productsIHS=";00601800:820531:a";
				customerIDIHS="";
			</script> 
		

		<script type="text/javascript">_satellite.pageBottom();</script>
		
</body>
</html>


<script language="javascript">


	// jQuery UI Tooltip handler for upsell/cross-sell links
	jQuery(function(){
		jQuery('.doc-name').each(function(i, e){
			jQuery(e).tooltip({
				'tooltipClass': 'upsell-tooltip',
				'content': jQuery(e).next().html(),
				// delay tooltip hiding 'onmouseout'
				'close': function(event, ui){
    				ui.tooltip.hover(
        				function(){
            				jQuery(this).stop(true).fadeTo(400, 1); 
				        },
        				function(){
            				jQuery(this).fadeOut('400', function(){ jQuery(this).remove(); });
        				}
    				);
  				}
			});
		});
		
		
		jQuery('.arrow-up img').click(function(e){
			document.location.href = '#doc-details-header';
		});
		
		jQuery('.backordered').tooltip({
			'tooltipClass': 'back-ordered-pricing-tooltip',
			'content': jQuery('.backordered-label').next().html(),
			'position': { at: "left+10 top+30" },
			// delay tooltip hiding 'onmouseout'
			'close': function(event, ui){
				ui.tooltip.hover(
    				function(){
        				jQuery(this).stop(true).fadeTo(400, 1); 
			        },
    				function(){
        				jQuery(this).fadeOut('400', function(){ jQuery(this).remove(); });
    				}
				);
			}
		});
		
		jQuery('.multi-user-pdf-tooltip').tooltip({
			'tooltipClass': 'multi-user-pdf-pricing-tooltip',
			'content': jQuery('.multi-user-pdf-tooltip').next().html(),
			// delay tooltip hiding 'onmouseout'
			'close': function(event, ui){
				ui.tooltip.hover(
    				function(){
        				jQuery(this).stop(true).fadeTo(400, 1); 
			        },
    				function(){
        				jQuery(this).fadeOut('400', function(){ jQuery(this).remove(); });
    				}
				);
			}
		});
		
		jQuery('.history-button').tooltip({
			'tooltipClass': 'pricing-tooltip',
			'content': jQuery('.history-button').next().html(),
			'position': { at: "right top+30" },
			// delay tooltip hiding 'onmouseout'
			'close': function(event, ui){
				ui.tooltip.hover(
    				function(){
        				jQuery(this).stop(true).fadeTo(400, 1); 
			        },
    				function(){
        				jQuery(this).fadeOut('400', function(){ jQuery(this).remove(); });
    				}
				);
			}
		});
	});

</script>