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How the IOM Is Organized
7017 6300–005 5–3
0710A
MSM
KIUB
CIOM
IOM
4 CSBs
*
*
2 of 4 busses can drive Internal and External Channels.
Domain 0
Domain 1
CIOMCIOM
4 CSBs
4 CSBs
MSM
CIOM
4 CSBs
CIOM CIOM
IOM
4 CSBs
*
CIOMCIOM
4 CSBs
4 CSBs
CIOM
4 CSBs
KIUB
**
CIOM CIOM
CIOM
***
**
Optionally dedicated for Multi-IOU functionality
Optionally dedicated for TCU functionality
***
4 CSBs 4 CSBs
Figure 5–2. NX5820 K IOM Organization
IOM Physical Organization
Each NX5820 and NX5820 K domain contains a front and rear card module assembly with
specific locations for the IOB or KIUB, CIOMs, and internal channel rack. See Figure 5–3
for card module assembly for the NX5820 and Figure 5–4 for NX5820 K.
The front card module assembly contains:
• One card slot per domain accepts a 6U IOB or KIUB card (slot A5 for Domain 0, slot
B5 for Domain 1).
The rear card module assembly contains:
• One card slot per domain accepts the first 9U CIOM card (slot A4 for Domain 0, slot
B4 for Domain 1).
• For NX5820, one card slot per domain for the middle 9U CIOM card dedicated for IOU
functionality (slot A6 for domain 0, slot B6 for domain 1). Optional card slots per
domain for the second, third, and fourth 9U CIOM cards (slot A5, A7, and A8 for
Domain 0, slot B5, B7, and B8 for Domain 1).
• For NX5820 K, optional card slots per domain for the second, third, fourth, fifth, and
sixth 9U CIOM cards (slot A5, A6, A7, A8 and A9 for Domain 0, slot B5, B6, B7, B8, and
B9 for Domain 1).
• Twelve 3U card slots per domain within the internal channel rack to accept channel
cards. Eight 3U card slots (lower rows) can be converted into 6U card slots.
• Each CS-bus interface can support up to sixteen channel loads (see ”Assigning
Channel Loads”).
• The first CIOM per domain (slot A4 for Domain 0, slot B4 for Domain 1) can support
up to four CS-Busses plus two internal busses as follows: