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diff --git a/indra/llmessage/llthrottle.h b/indra/llmessage/llthrottle.h
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+++ b/indra/llmessage/llthrottle.h
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+/** 
+ * @file llthrottle.h
+ * @brief LLThrottle class used for network bandwidth control
+ *
+ * Copyright (c) 2001-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LL_LLTHROTTLE_H
+#define LL_LLTHROTTLE_H
+
+#include "lltimer.h"
+
+const S32 MAX_THROTTLE_SIZE = 32;
+
+class LLDataPacker;
+
+// Single instance of a generic throttle
+class LLThrottle
+{
+public:
+	LLThrottle(const F32 throttle = 1.f);
+	~LLThrottle() { }
+
+	void setRate(const F32 rate);
+	BOOL checkOverflow(const F32 amount); // I'm about to add an amount, TRUE if would overflow throttle
+	BOOL throttleOverflow(const F32 amount); // I just sent amount, TRUE if that overflowed the throttle
+
+	F32 getAvailable();	// Return the available bits
+	F32 getRate() const				{ return mRate; }
+private:
+	F32 mLookaheadSecs;	// Seconds to look ahead, maximum
+	F32	mRate;	// BPS available, dynamically adjusted
+	F32	mAvailable;	// Bits available to send right now on each channel
+	F64	mLastSendTime;		// Time since last send on this channel
+};
+
+typedef enum e_throttle_categories
+{
+	TC_RESEND,
+	TC_LAND,
+	TC_WIND,
+	TC_CLOUD,
+	TC_TASK,
+	TC_TEXTURE,
+	TC_ASSET,
+	TC_EOF
+} EThrottleCats;
+
+
+class LLThrottleGroup
+{
+public:
+	LLThrottleGroup();
+	~LLThrottleGroup() { }
+
+	void	resetDynamicAdjust();
+	BOOL	checkOverflow(S32 throttle_cat, F32 bits);		// I'm about to send bits, TRUE if would overflow channel
+	BOOL	throttleOverflow(S32 throttle_cat, F32 bits);	// I just sent bits, TRUE if that overflowed the channel
+	BOOL	dynamicAdjust();		// Shift bandwidth from idle channels to busy channels, TRUE if adjustment occurred
+	BOOL	setNominalBPS(F32* throttle_vec);				// TRUE if any value was different, resets adjustment system if was different
+
+	void packThrottle(LLDataPacker &dp) const;
+	void unpackThrottle(LLDataPacker &dp);
+public:
+	F32		mThrottleTotal[TC_EOF];	// BPS available, sent by viewer, sum for all simulators
+
+protected:
+	F32		mNominalBPS[TC_EOF];	// BPS available, adjusted to be just this simulator
+	F32		mCurrentBPS[TC_EOF];	// BPS available, dynamically adjusted
+
+	F32		mBitsAvailable[TC_EOF];	// Bits available to send right now on each channel
+	F32		mBitsSentThisPeriod[TC_EOF];	// Sent in this dynamic allocation period
+	F32		mBitsSentHistory[TC_EOF];		// Sent before this dynamic allocation period, adjusted to one period length
+
+	F64		mLastSendTime[TC_EOF];		// Time since last send on this channel
+	F64		mDynamicAdjustTime;	// Only dynamic adjust every 2 seconds or so.
+
+};
+
+#endif