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Circuit Protection for T1/E1, T3/E3, xDSL, and POTS

T1/E1 and T3/E3 are the first and third generations of digitally multiplexed carrier signals. The T-carriers are prominent in N. America, Japan and S. Korea while the E carriers are used in the rest of the world. Maximum bit rates for these systems are shown in the table below.

DSL, ADSL, VDSL and various versions of these are concurrent standards for transmitting digital data on legacy phone lines. Voice (telephone) and xDSL signals are multiplexed on the same twisted pair using multi-tone frequency-division-multiplexing. An isolation transformer enables the translation of xDSL signals to the telephony voltage.

Protocol Max. Speed Voltage Range Differential Comments
T1/E1 1.54 Mbps / 2 Mbps ±5 V, ±12 V Yes Tx pair, Rx pair
T3/E3 44 Mbps / 34 Mbps ±5 V Yes Tx pair, Rx pair
ADSL2, ADSL2+ 12 Mbps down, 1 Mbps up 24 Mbps down, 3 Mbps up 8, 12, 16, 24 V Optional -
VDSL 52 Mbps down, 12 Mbps up 8, 12, 16, 24 V - -
POTS Analog, 3 kHz ±130 V When Ringing on-SLIC Ringing

T1 connector T1 connector T1 connector

 

Typical Application

T1/E1 links (< 2Mbps) and T3/E3 links (< 43Mbps) are susceptible to ESD strikes, cable-discharge events and lightning-induced transients.

xDSL lines (< 52Mbps) are susceptible to ESD strikes, cable-discharge events and lightning-induced transients.

Tertiary & Secondary Protection Used: TSPDs

Tertiary & 
Secondary Protection Used: TSPDs


Line Side: NP3100SCMC
Transformer Side: SL15 x 2
(bidirectional)
Tertiary & 
Secondary Protection Used: TSPDs


Features
Benefits


Solutions

TVS - Transient Voltage Suppressors

Transient Voltage Suppressor diagram

Device Max VDC
[V]
Surge IPP, 8/20 µs
[A]
TYP
Line-Line Capacitance [pF]
ESD Contact Rating (kV) Package
SRDA3.3 3.3 25 4.0 ±8 SOIC-8
SRDA05 5.0 23 5.0 ±8 SOIC-8
SL05 to SL24 5 to 24 5 to 17 3.5 ±8 SOT-23
LC03-6 6.7 100 8.0 ±30 SOIC-8


TSPD - Thyristor Surge Protection Devices

TSPD- Thyristor Surge Protection Device schematic TSPD- Thyristor Surge Protection Device schematic

Device VDRM
[V]
V(BO)
[V]
VT
[V]
C0 [pF] IH [mA] Surge IPP, 10/1000 µs [A] Package
NP0080TA Series 8-16 9.5-18 - 11-13 50 50 (8/20 µs) TSOP-5


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