CANOGA PERKINS 3240S SNMP Managed Fiber Optic Multiplexer - Manual (Page 19)

3240S F I B E R O P T I C M U L T I P L E X E R
3240S Fiber Optic Multiplexer
2.3 Interface Module (I/O) Cards
There is a variety of I/O card options available for the 3240S. Your selection and use of each card will depend upon the
application. Figure 2-4 shows a 3240S with a standard T1 and an E1 I/O card. Managed I/O cards can be used both in a
managed domain as well as a non-managed domain. The only I/O card presently available for the 3240S that cannot be
managed is the MDSO card. All cards, managed or not, must have the time slot and physical slot properly set prior to
operation. Reference section 2.3.1, 2.3.2, and 2.3.3 for a description of I/O card jumper and switch settings.
The I/O cards are configured to test specifications, and not necessarily to your system requirements.
Check circuit board jumper and switch settings prior to installation.
Figure 2-4
3240S With Standard T1
and E1 I/O Module Installed
2.3.1 Physical Slots / Logical Time Slot
The 3240S has two physical slots which divide the total available front end bandwidth into four equal, logical time slots. The
allocation of these time slots will depend upon the I/O card as well as the configuration of each card. T1, E1, or E1 V.35, I/O
cards will occupy two time slots; whereas the MDS0 I/O card can occupy one or two time slots, depending on the speed of
the operation. Physical slots and logical slots are set with switches and jumpers and cannot be controlled via the Network
Management (NMS) System.
Typical time slot combinations of the managed E1 and T1 I/O cards can be described as any combination of I/O Interface
cards that equal four logical time slots. T1 cards utilize two time slots, E1 cards two time slots, and the unmanaged MDSO card
uses only one time slot. Reference Table 2-A on page 2-6 for logical time slot allocation (or board address). Logical addresses
can only be used once.
Physical card slots and logical time slots are not related. Each time slot has its own discrete
board address, while each card can reside in either physical card slot. The actual board
address or time slot allocation is determined by the jumpers on each card. Multiplexer A has a
card addressed for time slot one (1 & 3) and is located in physical slot two. This card can talk
to Multiplexer B’s interface card addressed similarly to time slot one (1 & 3) regardless of the
I/O card's physical location. The Network Management System (NMS) will flag a
"configuration error" if any cards within the same chassis are set to the same logical address.
2-3