Packet Switch Unit Model 2 (PSU2) Considerations
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Overview
This section discusses the engineering considerations for the packet
switch unit model 2 (PSU2) to support SIP for Packet Trunking.
Configuration
requirements
The SIP for Packet Trunking feature:
• is supported only on the first PSU2 of a double PSU2
configuration (only applies to wireless applications),
• requires PHE2s and PH33s, and
• requires a data fanout 2 (DF2) on each shelf equipped with
PHE2s and/or PH33s.
Note: The PH33s are not required on the DRM/VCDX.
Earlier versions of PHs, for example PH22, PH3, etc., do not support
SIP for Packet Trunking.
Recommendations
Although there are no restrictions on mixing PH types, it is
recommended not to mix applications on the same GSM.
For increased reliability, any loadshared PHs such as GQPHs should
be equipped across:
• separate fuse groups,
• power buses, and
• PSU2 shelves
Note: These recommendations do not apply to DRM/VCDX - there is
only one SM, and there are not any loadshared GQPHs.
when possible. Refer to the Administration and Engineering
Guidelines, 235-070-100 document for additional PH engineering
considerations.
Figure 4-1, “Two shelf PSU2” (4-7) layout can be referenced when
reviewing Table 4-4, “PH equipage - one shelf” (4-7) and Table 4-5,
“PH equipage - two shelves” (4-8).
Engineering Considerations
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4-6
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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