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FIBOCOM L860-GL Series Hardware Guide Page 37 of 60
serpentine line and another one of the differential lines must be less than 2 times the spacing of normal
differential lines (S1 < 2S).
PCIe Difference Pair 1
W
S
S1<2S
≥3W
≥135°
≥20mil
PCIe Difference Pair 2
≥1.5W
Figure 3-13 Requirement of PCIe line
The difference in length of two data lines in difference pair should be within 5mil, and the length match is
required for all parts. When the length match is conducted for the differential lines, the designed position
of correct match should be close to that of incorrect match, as shown in Figure 3-14. However, there is no
specific requirements for the length match of transmit pair and receiving pair, which means the length
match is only required by intra differential pair rather than inter differential pair.
Correct match
Dismatched end
Incorrect match
Matched end
Figure 3-14 Length match design of PCIe differential pair
3.5 USIM Interface
The L860 module support dual SIM card single standby, with one built-in USIM card interface, which
supports 1.8V and 3V SIM cards.
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