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SER-BUS (Serial communication bus)
Issue 1 June 2005 1957
SER-BUS (Serial communication bus)
G650
Each port network of G650s has a Serial Bus that allows the TN231O2BP IPSI to communicate
with the 655A power supplies. This Serial Bus uses 2 previously unused leads in the Universal
Port Slot. SPARE3 (pin 055) now becomes serial data. SPARE4 (pin 155) now becomes serial
clock. The serial communication bus is a two-wire bi-directional half-duplex bus that is provided
on the backplane of the G650. The serial bus consists of a clock line and a data line. Data is
transferred on the data line synchronously in bit-serial fashion a byte at a time. Communication
on the serial bus is at speeds up to 100 kbits per second.
Older TDM/LAN cables did not have these 2 leads so the G650 required a new TDM/LAN cable.
These 2 leads are not terminated on the TDM/LAN Terminators (AHF110). This is an
open-collector bus where each power supply and each TN2312BP IPSI provide a pull-up
resistor to +5VDC for each of the 2 Serial Bus leads. The bus will have logic pulses extending
between 0V and 5V.
The TN2312BP IPSI in the A carrier will act as master of the serial bus and poll each of the
power supplies based on their board address. Only a TN2312BP IPSI in the A carrier can be a
bus master, even if a TN2312BP in carrier B is used for port network connectivity. Therefore,
setting the TN2312BP in the A carrier or B carrier to be active will not clear a problem if the
TN2312BP itself is the reason for the failure. The power supply’s board address is derived from
4 board address leads in the power slot of the backplane. The G650 carrier addressing paddle
card sets 3 of these 4 address leads for the power slot. A G650 can have a maximum of ten
655A power supplies on the serial bus (See Figure 114: Wiring diagram for serial bus data and
clock leads on page 1958).
Note:
Note: The serial bus is provided only to a G650 equipped with TN2312BP IPSI circuit
packs. The serial bus is not available on any other media gateway.
Figure 115: G650 Cabinet Environmental Hardware Components
on page 1959 illustrates
these components.
MO name Alarm level Initial SAT command to run Full name of MO
SER-BUS MIN test environment location sh SER communication bus
SER-BUS MAJ test environment location l SER communication bus