Alcatel-Lucent 9500 MXC, User Manual

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Vol. VI-E-6 Alcatel-Lucent
From this it may be determined that:
• Where all traffic on the ring is ring-protected, the number of E1/DS1 circuits
used on a 9500 MXC backplane equates to the number of circuits on the ring
plus half the number of circuits drop-inserted on the backplane. The total must
not exceed 100 or 128 respectively.
Such circuits may be dropped to a DAC as local tribs, and/or to a RAC to go to
remote tribs.
• For a north-south gateway ring, through which all circuits on the ring are
sourced, 64xE1 or 84xDS1 is the usable maximum. For example, a 75xE1
north-south capacity is not possible as 113xE1 would be needed at the gateway.
Working backwards, the maximum that can be north-south sourced is
nominally 64xE1 (leaves 4xE1 spare).
• Where there are two or more gateways on the ring, a full 75xE1 or 100xDS1
ring capability can be used, providing the backplane capacity formula is not
infringed for any node on the network.
Rings With Pt-to-Pt Traffic Overlay
This application has point-to-point traffic transported side-by-side with
ring-protected traffic:
• Ring traffic is protected by normal ring operation.
• Point-to-point traffic is not protected by the ring.
• Point-to-point traffic can be transported over one, many, or all ring hops.
Refer to the example in Figure E-6, which shows a 32xE1 ring with 32xE1
point-to-point overlay on two hops:
Co-channel ring operation is to be supported in a later release, and requires
co-located INU/INUes at each site.