1. XMBTM Product 10 Gbps Backplane using Multiwire ® Technology
February 24, 2019
PCKTECHNOLOGYINC

2. The System Environment
Backplane
Ingress Line Cards
Switch Card
Egress Line Cards
System Cabinet
The number of ingress line cards and their optical capacity continues to increase the volume of data to the switch card.
Backplane channel capacity must also increase.
February 24, 2019
PCKTECHNOLOGYINC

3. Backplane Channel Capacity
Each line card requires two differential pairs (In/Out).
For 16 cards with 100 Gbps capacity, 1,280 ,2.5 Gbps differential paired channels are required.
Greater channel bandwidth is necessary.
Difficult to achieve with conventional PCB technology.
February 24, 2019
PCKTECHNOLOGYINC

4. Insertion Loss (Attenuation)
At high frequencies, a wave loses energy in several ways:
The resistance of the conductor is small , but can be significant over long lengths and will produce heat.
The dielectric may cause loss; it’s resistance is high, but not infinite and some energy is lost
The electromagnetic energy radiates at high frequencies; significant energy losses are possible as the conductor acts like an antenna.
Energy is reflected due to impedance mismatches or discontinuities.
February 24, 2019
PCKTECHNOLOGYINC

5. The Attenuated Signal
Ideal Waveform
Skin Effect
Bandwidth Limit
Low Loss Line
Noise Effect
Lossy Line
Normalized Voltage
Threshold
Time In Nanoseconds
Degradation in risetime coupled with jittery edge timing will limit channel capacity.
February 24, 2019
PCKTECHNOLOGYINC

6. XMB Multiwire Backplanes
The goal of XMB technology is to build backplanes that are able to support serial line rates of 10Gbps and are interoperable with the 10Gigabit Attachment Unit Interface (XAUI).
February 24, 2019
PCKTECHNOLOGYINC

7. XMB Performance Specification
IEEE 802.3ae is the 10 Gigabit XAUI standard and provides relevant performance criteria.
The parameters that may be used to evaluate the relative merits of any digital interconnect performance are signal loss, timing jitter and BER.
Signal Loss: No more than 14 dB total loss.
Jitter: No more than 25% of Unit Interval (UI)
Jitter: Bit Error Rate (BER): no greater than 10-12
February 24, 2019
PCKTECHNOLOGYINC

8. XMB Performance Signal Loss:
Test data from trial traces is acceptable at 14 dB loss.
February 24, 2019
PCKTECHNOLOGYINC

9. XMB Performance Unit Interval (UI) Channel 7 10.7 GHz
XAUI Requirement :
Maximum Value J p-p < 0.35 UI to achieve BER
Unit Interval (UI)
Channel 7
93 ps
10.7 GHz
J p-p
= ps
(0.18 UI)
February 24, 2019
PCKTECHNOLOGYINC