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Silver
TELECOM
AG2120
FEATURES
V2.0October 2002 Advance data Sheet
FULLY FEATURED P S T N IN T E R F A C E
* A highly featured PSTN Interface (COIC, FXO, DAA, Trunk Interface) in a single DIL or 12mm high SIL device. * +5V or +3.3V supply. * Transformer isolation providing high common mode rejection (CMRR) for use in un-grounded systems. * Highly integrated with on board loop switch and integral diode bridge. * Loop start circuit, ringing detect and loop current detection. Parallel phone detect. * Tip-ring polarity reversal detect (for Caller Line ID and remote metering) and on-hook reception. * Meets requirements of EN60950/UL1950, and FCC Pt68. Low cost power cross protection. * Programmable d.c. mask, line and network impedances. * Silver Telecom "design-in" assistance.
TIP RING
V IN
TRUNK
V OUT
Control and Supervision
DESCRIPTION
The AG2120 is a self-contained highly integrated PSTN Interface Circuit in a single SIL or DIL Module. In addition to the features listed, the AG2120 allows flexible programming of many functions, including the dc voltage mask and impedances. The AG2120 meets international safety and regulatory requirements. The device requires a minimum of external components and has been specified for ease of use, to reduce time to market. The AG2120 is designed for all applications, including those where there is a high level of common mode interference, such as PABX, long loop applications and systems without a ground.
(c) Silver Telecom 2002
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
Ordering Information
AG2120D AG2120S Fully featured Trunk in DIL package Fully featured Trunk in SIL package
AG2120
Silver TELECOM
Figure 1: AG2120D - DIL Packaging Format
AG2120
Silver
T E L EC O M
Figure 2: AG2120S - SIL Packaging Format
V CC DMa DMb
GND
Power Management 2-4 Wire Converter
Tip Ring
Line Termination & Loop Switch
Z T1 Z T2 Zb V TR Vref Vout Vin RS LC LSC F/R
Supervision
Anode
Gate
Cathode
Figure 3: Functional Block Diagram
(c) Silver Telecom 2002 Page 2
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
1.0 Pin Description 1.1 DIL Pin-Out Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Name TIP (A) RING (B) CATHODE ANODE DMa DMb GATE GND VCC ZT2 ZT1 Zb VIN nc VOUT F/R LC LSC RS VREF VTR Description Tip. Connects to the subscriber line Tip. Ring. Connects to the subscriber line Ring. Cathode. For power cross protection connect to protection device cathode. Anode. For power cross protection connect to protection device anode. DC Mask a. A resistor is connected between this pin and DMb to adjust the d.c. characteristics of the termination. DC Mask b. A resistor is connected between this pin and DMa to adjust the d.c. characteristics of the termination. Gate. For power cross protection connect to protection device gate. Analog ground. Normally connected to system ground. Positive supply. Must be connected to +5V or +3.3V. 2 Wire matching network 2. The 2 wire impedance matching network is connected between this pin and ZT1. The compensation impedance Zc is connected between this pin and Zb. 2 Wire matching network 1. The 2 wire impedance matching network is connected between this pin and ZT2. Balance network. The network balance matching components are connected between this pin, VIN and GND. Audio In. This is the analog input signal from the Codec (which is output on Tip and Ring). Connected via a 100nF capacitor. No connect. This pin is not used and can be left open circuit. Audio Out. This is the analog output signal (from Tip and Ring) to the Codec. Connected via a 100nF capacitor. Forward/reverse. A logic 1 indicates that the Tip and Ring polarities are reversed. i.e. Tip is negative with respect to Ring. Loop current. A logic 1 Indicates that loop current is flowing. Loop switch control. Applying a logic 1 closes the integral loop switch. Ringing signal. A logic 0 indicates the presence of ringing voltage on the telephone line. Toggles at ringing frequency. Reference voltage. Used with VTR to detect off-hook parallel phone. Normally left open circuit. Approx. +1.9V Tip/Ring voltage. Indicates the voltage at Tip/Ring. Divided by 50 and relative to Vref.
Page 3
(c) Silver Telecom 2002
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
1.2 SIL Pin-Out Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name RING (B) TIP (A) CATHODE ANODE GATE DMb DMa LC VIN VOUT LSC GND VCC F/R Zb ZT2 ZT1 RS VREF VTR Description Ring. Connects to the subscriber line Ring. Tip. Connects to the subscriber line Tip. Cathode. For power cross protection connect to protection device cathode. Anode. For power cross protection connect to protection device anode. Gate. For power cross protection connect to protection device gate. DC Mask b. A resistor is connected between this pin and DMa to adjust the d.c. characteristics of the termination. DC Mask a. A resistor is connected between this pin and DMb to adjust the d.c. characteristics of the termination. Loop current. A logic 1 Indicates that loop current is flowing. Audio In. This is the analog input signal from the Codec (which is output on Tip and Ring). Connected via a 100nF capacitor. Audio Out. This is the analog output signal (from Tip and Ring) to the Codec. Connected via a 100nF capacitor. Loop switch control. Applying a logic 1 closes the integral loop switch. Analog ground. Normally connected to system ground. Positive supply. Must be connected to +5V or +3.3V. Forward/reverse. A logic 1 indicates that the Tip and Ring polarities are reversed. i.e. Tip is negative with respect to Ring. Balance network. The network balance matching components are connected between this pin, VIN and GND. 2 Wire matching network 2. The 2 wire impedance matching network is connected between this pin and ZT1. The compensation impedance Zc is connected between this pin and Zb. 2 Wire matching network 1. The 2 wire impedance matching network is connected between this pin and ZT2. Ringing signal. A logic 0 indicates the presence of ringing voltage on the telephone line. Toggles at ringing frequency. Reference voltage. Used with VTR to detect off-hook parallel phone. Normally left open circuit. Approx. +1.9V Tip/Ring voltage. Indicates the voltage at Tip/Ring. Divided by 50 and relative to Vref.
(c) Silver Telecom 2002
Page 4
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
ringing signal. The LSC pin can be controlled by the output drive pins of a Codec or from a micro controller device. Once the Loop Switch has been closed confirmation that loop current is flowing is provided by the LC pin. This can be used for fault detection and for call clear detection.
2.0
Line Interfacing
The AG2120 line interface provides a flexible and robust interface to the telephone line. It has been designed to meet regulatory standards whilst providing a space and power efficient solution.
2.1
D.C. Termination.
Any equipment terminating a telephone line must present the correct d.c. resistance to the line. This ensures that the correct current flows to be able to detect the off hook condition, avoids excessive power dissipation in the Subscriber Line Interface (SLIC) and the Subscriber's equipment, and minimises the size of power supply needed to drive the SLIC. The AG2120 has been designed to meet the requirements of many network operators. This is done by making the d.c. characteristic adjustable. These are controlled by connecting the DM pins on the line side of the circuit. Table 1 shows how these are connected.
2.2.2 Ringing Detection and Sensitivity.
The terminal equipment must be capable of detecting and responding to an incoming call in the same way as a telephone set. The termination circuitry must, therefore, detect the presence of the ringing signal. The AG2120 provides an output, RS, which indicates the presence of ringing by switching from a logic 1 to logic 0. The RS output will toggle at the ringing frequency. A capacitor to ground can also be added if ringing cadence is needed rather than the ringing frequency. The sensitivity to ringing is set internally to 22VRMS when VCC is +5V, or 14VRMS when VCC is +3.3V.
Table 1 Set Up of the DM Pins
Market
North America (EIA 464, Resistive) Europe (CTR21) Far East
DMa
DMb
2.2.3 Reversal Detect
The reversal of the battery polarity is used as a signalling technique. The AG2120 can detect this condition and provides an output on the F/R pin, whether in the on-hook or off-hook state. One example of this type of signalling is in Caller Line ID in the United Kingdom, where a battery polarity reversal precedes the transmission of data before the ringing signal is applied to the line. Another example is in some systems in the US where a reversal is used to indicate far end answer.
Connect together through 390K resistor Connect together through 390K resistor Connect together through 390K resistor
2.2
Signalling and Loop Status.
The AG2120 provides facilities to monitor and control the telephone line. This allows the device to be used with a variety of loop signalling schemes and minimises the number of external components needed to implement a complete line interface. In order to implement ground start applications please contact Silver Telecom or our local representative.
3.0 The 2-4 Wire (Hybrid) Conversion.
The AG2120 transmits and receives balanced 2-wire analog signals at the Tip and Ring connections. These are converted to a ground referenced output at VOUT and from a ground referenced signal at VIN. VOUT and VIN are normally connected to a Codec (via d.c. blocking capacitors) for conversion to and from a Pulse Code Modulated (PCM) stream.
2.2.1 The On-Board Loop Switch
The AG2120 implements the loop start protocol when initiating and answering a call. This means that a switch must be closed to allow loop current to flow, signalling to the SLIC that the terminating equipment has gone "off-hook". This has been done historically by a relay. The AG2120 uses an integral optically isolated switch to do this, eliminating the need for an external relay, so space and cost is saved for the user. The on-board Loop Switch is controlled by the LSC pin. A logic 1 applied to the pin closes the loop switch. This is done when the terminating equipment wishes to begin a call or in response to the reception of the (c) Silver Telecom 2002
3.1 Transmit and Receive Gain.
The gain in both the transmit and receive directions is set at 0dB. Any gain adjustments can be made using the Codec functionality. This is either by hardware or software depending upon the Codec used.
Page 5
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
Network Balance Impedance 600 CTR21 AT&T compromise ZT ZC Zb1 Zb2 Zb3 C3 Notes USA Short Line, Far East, Middle East Europe USA Long Line
eg.
2-wire Impedance 600 CTR21 600
1 2 3
300 TBA 300
47K TBA TBA
100K TBA TBA
0R TBA TBA
--TBA TBA
--TBA TBA
Table 2: Line and Network Balance Impedance Examples
3.2 The 2 Wire Impedance
The input impedance, ZIN, of the AG2120 can be programmed. This is achieved by connecting an impedance matching network between ZT1 and ZT2. This network is the line impedance to be matched minus 300. For example to match 600, fit a 300 resistor. Other common line impedances, and the corresponding programming components are listed in Table 2. In addition to the programming network, an impedance, ZFC, must be fitted between ZT2 and Zb to provide frequency compensation. An alternative method of programming the 2 wire impedance is to choose a codec where the internal filter characteristics can be programmed to provide the correct matching. In order to generate the filter
V CC ZT ZC Z b1 V CC DMa R1 DMb TIP Z T1 Z T2 Zb V IN V OUT C1
coefficients a model of the AG2120 must be used. This file, in .CIR format is available on request from Silver Telecom or one of our representatives. Full details on how the Codec is programmed must be obtained from the Codec manufacturer.
3.3
Network Balance Impedance
The setting of the network balance impedance is very similar to that of the 2 wire impedance. Again this can be done by programming of the Codec, using the .CIR file, or it can be done by hardware components.
3.4
On-Hook Reception
The need to provide the facility for data exchange On-Hook is becoming increasingly common, whether for Caller Line I.D. or for telemetry purposes. The
Z b2 Z b3 C3 GND
AG2120
C2
Codec
RS LC
RING
For 600 application: R1 = 390K Zb1 = 100K Zb2 = 0R Zb3 = NF ZT = 300R ZC = 47k C1, C2 = 100nF C3 = NF
GATE ANODE
Silver
TELECOM
LSC F/R
CATHODE
GND
GND
Figure 4: Line Impedance and Network Balance Components
(c) Silver Telecom 2002 Page 6
V2.0 October 2002 Advance Data Sheet AG2120 can receive signals On-Hook, presenting a high impedance to the line, i.e. while drawing a very small current (5A approx) from the line.
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
Examples of suitable devices are:Joyin JVR-14N201K; Walsin VZ14D201KBS Note: If varistors to ground are used for added protection (e.g. more than 1500V) customers should be aware that the FCC test generator for longitudinal tests is rated at up to 1000A. 10 2W wire wound surge limiting resistors will also be needed.
3.5
Ringer Load Networks
The "dummy ringer" is usually a capacitive/resistive load which is connected across TIP/RING. During a call it is of sufficiently high impedance not to affect the operation of the interface. The AG2120 meets the dummy ringer requirements for CTR21 (Europe), USA and Asia.
4.2
UL1459 and UL1950 Protection.
4.0
Device Protection.
As with many of the requirements which must be met by the AG2120 the device protection is dependent upon regulatory standards in the market in which the equipment is deployed. Some examples are given below, but these are not exhaustive. For a more comprehensive overview of protection refer to the Silver Telecom protection applications note, which is available directly form Silver Telecom, via our web-site (www.silvertel.com), or through our local representative.
To meet the UL1459 and UL1950 mains cross test 22 2W wire wound surge resistors and 0.35A special fuses (Bussman C515 or Littelfuse 220003) in a balanced configuration are required. Alternatively a Teccor F1250T fuse may be used without surge limiting resistors. It is also possible to use PTC thermistors to meet these tests. The Raychem TR600-150 is designed for this application. See Raychem application notes for further details. A typical application is shown in figure 6a.
4.1
FCC Pt 68 Requirements.
4.3
Other Standards.
To withstand the FCC Pt68 longitudinal voltage surge of 1500V no protection is required as the barrier will withstand 1500V peak voltage to GND. To withstand the FCC Pt68 metallic surges at 800V requires a 130V AC varistor (which clamps at 300V which is the rating of the loop switch transistor). A 14mm device should be used to withstand the two 100A 10/560us surges.
ZT
The AG2120 has provision for low cost mains cross protection (CCITT K21): a 47 2W wire wound surge resistor and a PTC thermistor are sufficient to meet regulatory approvals. A suitable device is the Walsin PTD3A350H26. (Metallic protection with a single device is all that is required as the AG2120 will withstand longitudinal voltages up to 1000Vrms to ground without additional protection). As an option, for improved off-hook power cross
ZC Z T1 DMa R1 DMb Z T2 Zb Z b2 C3 0V VoicePump DSP shown for illustration purposes. AG2120 can interface to any codec C1
LOUT LIN
AG2120
Z b1 VIN VOUT
C2
VoicePump VP140 DSP
AGPIO
Processor Interface
RS LC TIP PTC X1 RING Protection Circuit Protection circuit depends upon precise application GND C5 Typical protection: C4 +
Silver TELECOM
V CC
LSC F/R
For 600R line and balance impedance: V CC
R1 = 390k Z b1 = 100k Z b2 = 0R Z T = 300 Z C = 47k C1, C2, C4 = 100nF C3 = NF C5 = 10uF PTC = TR600-150 (Raychem) X1 = TVB200SA (Raychem)
Figure 5: Typical Application
(c) Silver Telecom 2002 Page 7
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
AG2120 AG2120
PTC TIP TIP
PTC
Central Office Line
X1 RING
Central Office Line
RING
TPP250
GATE GATE hook ANODE CATHODE ANODE
CATHODE
Fig 6a: Standard Protection
Fig 6b: Protection for Off-hook
Figure 6: Protection Options
protection, the AG2120 has been designed to interface directly to the STM TPP25011. This protection arrangement is shown in figure 6b. User/Network safety from mains power voltage (UL1950/EN60950 paragraphs 2.1.1 and 6.2.1.4) must be provided externally by a power supply with reinforced or double insulation.
5.0
Regulatory Standards
6.0 Layout
Signal tracks should be kept as short as possible. Special attention should be paid to DMa and DMb, as these are sensitive nodes.
There are some aspects of international standards which are not fully met by the AG2120. These are shown below. It is Silver Telecom's policy to bring to the attention of customers all known exceptions. The AG2120 meets the requirements of EN60950 (1992) paragraph 6.2.1.2 for all countries except Norway and Sweden. Please contact Silver Telecom if the product is needed for Norway or Sweden.
(c) Silver Telecom 2002
Page 8
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
7.0
Absolute Maximum Ratings*
Parameter Sym VCC VTR -0.3 PTRUNK PTOT ILOOP IRING TS -40 Min -0.3 Max 6.0 300 6.0 0.75 3.0 90 185 +100 Units V V V W W mA mA
O
All Voltages are with respect to ground unless otherwise stated.
1 DC supply voltage 2 DC battery voltage present between Tip and Ring (on-hook) 3 Maximum voltage on programmable pin, LSC 4 Maximum power dissipation per trunk @ 25C 5 Maximum power dissipation per module @ 25C 6 Maximum loop current 7 Maximum ringing current (for 0.5 second) 8 Storage Temperature
C
*Exceeding the above ratings may cause permanent damage to the product. Functional operation under these conditions is not implied. Maximum ratings assume free air flow.
8.0
Recommended Operating Conditions*
Parameter Symbol VCC VCC VTIP VRING ILOOP TOP Min 4.75 3.0 0 0 0 0 Typ 5.0 3.3 0 -48 25 25 Max 5.25 3.6 -120 -120 85 70 Units V V V V mA
O
All Voltages are with respect to ground unless otherwise stated.
1 2 3 4 5
DC supply voltage (+5V operation) DC supply voltage (+3.3V operation) DC battery voltage on Tip and Ring (on-hook) DC loop current Operating Temperature
C
*Typical figures are at 25C with nominal +5V supplies and are for design use only.
(c) Silver Telecom 2002
Page 9
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
9.0 DC Electrical Characteristics.
Characteristic 1 2 3 Supply current (per trunk), 3 on-hook Loop current range Status outputs, RS, F/R Output low voltage Output high voltage Status outputs, RS, F/R Output low voltage Output high voltage Control input, LSC Input low voltage Input high voltage Control input, LSC Input low current Input high current Control input, LSC Input low voltage Input high voltage Control input, LSC Input low current Input high current Status output LC Output low voltage Output high voltage Status outputs LC Output low voltage Output high voltage Off-hook DC voltage Leakage current, Tip and Ring to analog ground Leakage current on-hook, Tip to Ring ILA ILTR Sym ICC ILOOP VOL VOH VOL VOH VIL VIH IIL IIH VIL VIH IIL IIH VOL VOH VOL VOH 14.0 Min Typ 2.5
2
Max 4.0 85.0 0.4
Units Test Comments mA mA V V V V V V A A V V A mA V V V V V +5V operation @ 50A @ -50A +3.3V operation @ 50A @ -50A +5V operation
1
4.5 0.4 2.8 0.3 4.5 500 100 0.3 2.8 500 100 0.5 4.5 0.5 2.8 5.7 35 35
4
5
6
+5V operation
7
+3.3V operation
8
+3.3V operation +5V operation @ 50A @ -50A +3.3V operation @ 50A @ -50A ILOOP = 20mA DMa-DMb = TBA 100VDC
3
4 9 10 11
A A
All DC Electrical Characteristics are over the Recommended Operating Conditions with VCC at +5.0V +5%, unless otherwise stated. 1 For test circuit details please contact Silver Telecom 2 Typical figures are at 25C with nominal +5V supply and 25mA loop current, unless otherwise stated. These figures are for design aid only. 3 Operating currents are dependant on the users application.
(c) Silver Telecom 2002
Page 10
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
1
10.0 AC Electrical Characteristics.
Characteristic Sym VRD VRD FR Min Typ* Max Units VRMS VRMS Hz k
Test Comments
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Ringing voltage: detect Ringing voltage: no detect Ringing voltage: detect Ringing voltage: no detect Ringing frequency Input Impedance at VIN Output impedance at Vout Absolute voltage gain, 2 Wire to VOUT Absolute voltage gain, VIN to 2 Wire On-hook gain, 2 Wire to VOUT Relative gain, referenced to 1kHz. 2Wire - Vout, Vin - 2Wire Total harmonic distortion @ 2Wire and Vout Overload distortion @2 Wire and 2 Vout Common mode rejection ratio Common mode overload level Idle channel noise
3
26 18 15
22 22 14 14
18 10 68
+5V operation
+3.3V operation
100 10 -0.5 -0.5 -0.5 -0.5
THD OD CMRR CMOL NC PSRR RL
dB dB dB dB % % dB
+0.5 +0.5 +0.5 +0.5 0.1 0.5 1.0 5.0
Off-hook Off-Hook
200 - 3400 Hz @0dBm, 1kHz @+3dBm, 1kHz 50 - 500Hz VCM = 60VRMS 50 - 60Hz @2 Wire & VOUT Ripple 0.1V, 1kHz on VCC 300-3400Hz 300-3400Hz 500-2500Hz 200-1000Hz 1000-4000Hz 1000V ac
70
75 250 12.0 300
VRMS dBrnC dB dB dB dB
Power supply rejection ratio at 2 Wire and Vout Return loss
4
25 18 18 21 60 40 70 70 5
Transhybrid loss
4
THL
Metallic to longitudinal balance Leakage current, Tip or Ring to analog ground
ILA
dB mARMS
All AC Electrical Characteristics are over the Recommended Operating Conditions with VCC at +5.0V +5%, unless otherwise stated. *Typical figures are at 25C with nominal 5V supply and 25mA loop current unless otherwise stated. These figures are for design aid only. 1 For test circuit details please contact Silver Telecom. 2 These figures fpr+5V operation. For +3.3V operation, OD is typically 5% at +3dBm. 3 In the off-hook condition 4 Into a 600 impedance
(c) Silver Telecom 2002
Page 11
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
11.0 Mechanical Specification and Pin Assignation 11.1 AG2120D - DIL Package
3.5mm 5.0 mm
1 7
19.0
Bottom View
42.0m 54.0
Not To Scale
21
2.0mm
20
9 8
5.0 mm 2.0mm 11.00
V REF LSC F/R NC Zb ZT2 GND
20 21
89
V TR RS LC V OUT V IN ZT1 V CC
1
Pin Names Bottom View
7
Tip (A) Ring (B) Cathode Anode DMa DMb Gate
GND ZT2 Zb NC F/R LSC V REF
89
20 21
V CC ZT1 V IN V OUT LC RS V TR
7
Pin Names Top View
1
Gate DMb DMa Anode Cathode Ring (B) Tip (A)
Silver Tel ecom recommends t he use of 2m m sockets, especially on prototype and pre-production boards . Recommended PCB hole diameter = 0.9 0.05 mm
(c) Silver Telecom 2002
Page 12
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
11.1 AG2120S - SIL Package
11.0mm
61mm
1.6mm 2.8mm
AG2120S
1
12.0mm
0.6 0.05 2.54 0.25 0.6 0.05 pin 1 12.7 0.25 Ring (B) Tip (A) Cathode Anode Gate DMb DMa 1.6mm
4.0
AG2120S
LC VIN VOUT LSC GND VCC F/R ZB ZT2 ZT1 RS VTR VREF
Silver Telecom recommends the use of 2.54mm sockets, especially on prototype and pre-production boards. Recommended PCB hole diameter = 1.1 0.05 mm
Information published in this data sheet is believed to be correct and accurate. Silver Telecom assumes no liability for errors which may occur or for liability otherwise arising out of use of this information or infringement of patents which may occur as a result of such use. No license is granted by this document under patents owned by Silver Telecom or licensed from third parties by Silver Telecom. The products, their specifications and information appearing in this document are subject to change by Silver Telecom without notice.
(c) Silver Telecom 2002
Page 13
V2.0 October 2002 Advance Data Sheet
AG2120
F U L L Y F E A T U R E D P S T N IN T E R F A C E
Change implemented CB CB SE
12.0 Change Sheet
Date of Change 8 Aug 2002 27 Sept 02 7 Oct 2002 Version Number V1.0 V1.1 V2.0 Description of Change First issue. Include VREF on DIL, and VREF and VTR on SIL Fill in various TBA's
(c) Silver Telecom 2002
Page 14

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