ds26518 Maxim Integrated Products, Inc., ds26518 Datasheet - Page 81

• Manufacturer Part Number: ds26518
• Description: 8-port T1/e1/j1 Transceiver
• Manufacturer: Maxim Integrated Products, Inc.

Figure 9-19. Network Connection—Longitudinal Protection
S3, S4, S5,
T1 and T2
T3 and T4
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
F1 to F4
S1, S2
S7, S8
NAME
S6
R
T
RING
RING
TIP
TIP
RX
TX
TX
RX
Changing S7 and S8 to P1800SC devices provides symmetrical voltage suppresion between tip, ring, and ground.
The layout from the transformers to the network interface is critical. Traces should be at least 25 mils wide and separated
from other circuit lines by at least 150 mils. The area under this portion of the circuit should not contain power planes.
Some T1 (never in E1) applications source or sink power from the network-side center taps of the Rx/Tx transformers.
The ground trace connected to the S3/S4 pair and the S5/S6 pair should be at least 50 mils wide to conduct the extra current
from a longitudinal power-cross event.
Alternative component recommendations and line interface circuits can be found by contacting
[e-mail]
The 1PF capacitor in series with TTIPn is only necessary for G.703 clock sync applications.
The 560pF on TTIPn/TRINGn must be tuned to your application.
1.25A Slow Blow Fuse
1.25A Slow Blow Fuse
25V (max) Transient Suppressor
180V (max) Transient Suppressor
40V (max) Transient Suppressor
Transformer 1:1CT and 1:2CT (3.3V, SMT)
Dual Common-Mode Choke (SMT)
Termination Resistor (120:, 110:, 100:, or
75:)
F2
F3
F4
F1
S8
S7
DESCRIPTION
S3
S4
S5
S6
or in Application Note 324, which is available at www.maxim-ic.com/AN324.
T3
T4
81 of 286
1:1
T1
2:1
T2
S1
S2
P1800SC MC
P0300SC MC
P0080SA MC
PE-65857
SMP 1.25
PE-68678
F1250T
R
PART
560 pF
T
1 uF
—
RTIPn
TTIPn
TRINGn
RRINGn
DS26518 8-Port T1/E1/J1 Transceiver
DS26518
MANUFACTURER
Teccor Electronics
Teccor Electronics
Teccor Electronics
Teccor Electronics
Pulse Engineering
Pulse Engineering
Bel Fuse
—
NOTES
1, 4, 5
2, 3, 5
1, 5
1, 5
—
5
5
5