This section describes how to replace the TN18EFI board in a universal platform subrack.
You are an NMS user with " NE operator" privilege or higher.
Before removing a TN18EFI board, set the subrack ID using the DIP switches on the new TN18EFI board. The subrack ID must be the same as that on the TN18EFI board to be replaced.
Replacement of the EFI interrupts alarm signal input and output, communication among subracks, and communication between NE and U2000. In addition, services may be interrupted.
Tools, Equipment, and Materials
ESD bag, Philips screwdriver and U2000
Method for Setting the Subrack ID
In a master/slave configuration, the ID of each subrack must be set for easy identification.
For a universal platform subrack, the subrack ID is configured using the two DIP switches on the TN18EFI board and is displayed on the front panel of the TN18EFI board. There are two types of the TN18EFI boards, which have the same functions but different network interface quantities and DIP switches.
· Type A
§ Panel schematic diagram:
§ Network management interface: NM_ETH/ETH1/ETH2/ETH3
§ DIP switches: eight DIP switches within the board
· Type B
§ Panel schematic diagram:
§ Network management interface: NM_ETH1/NM_ETH2/ETH1/ETH2/ETH3
§ DIP switches: five DIP switches on the board panel
DIP switches within the board (type A): Figure 1 shows the position of the DIP switches on the EFI board.
· The TN18EFI board has a set of eight DIP switches. ID1-ID4 correspond to bits 1-4 of SW2, and ID5-ID8 corresponding to bits 1-4 of SW1. Among these ID values, only ID1-ID5 are valid. ID6-ID8 are reserved. The bits from high to low are ID5-ID1. Each DIP switch can be used to set a binary digit, 0 or 1. When the DIP switch is toggled to ON, the value of the corresponding bit is set to 0.
· A maximum of 32 states can be set. The value is 00000 by default. "0" indicates the master subrack. The other values indicate slave subracks. As shown in Figure 1, the value represented by the ID5-ID1 is 00001, which is 1 in decimal system. That is, the subrack ID is 1.
Figure 1 Position of the DIP switches within
the board (type A)
DIP switches on the board panel (type B): Figure 2 shows the position of the DIP switches on the EFI board.
· The TN18EFI board has a set of five DIP switches whose IDs are ID1-ID5 from the lower bit to the higher bit. Each DIP switch can be used to set a binary digit, 0 or 1. When the DIP switch is toggled to 0, the value of the corresponding bit is set to 0. DIP switches must be toggled to the topmost or the bottommost. Otherwise, the subrack ID cannot be intuitively identified.
· A maximum of 32 states can be set. The value is 00000 by default. "0" indicates the master subrack. The other values indicate slave subracks. As shown in Figure 2, the value represented by the ID5-ID1 is 00001, which is 1 in decimal system. That is, the subrack ID is 1.
Figure 2 Position of the DIP switches on the
board panel (type B)
When it is the first time that the EFI board is installed in an universal platform subrack or when the changed subrack ID is the same as the previous subrack ID, the subrack_ID LED on the SCC and EFI boards will display the newly specified subrack ID.
If the newly specified subrack differs from the previous subrack ID, the subrack_ID LED on the SCC and EFI boards will alternately display the previous subrack ID and the EE value. When this occurs, determine whether the newly specified subrack ID is correct. If it is correct, power-cycle all the PIU boards inside the subrack to make it take effect. If it is incorrect, configure the DIP switches again to recover the previous subrack ID.
