PIC bays and NSM The AT-AR745 chassis has two PIC bays. A further four PIC bays can be added bay if an AT-AR040 NSM is installed in the NSM bay.
The NSM bay allows one NSM to be installed in the chassis. NSMs either have fixed ports (e.g., AT-AR041 and AT-AR042 BRI S/T NSMs) or PIC bays (e.g., the AT-AR040 4 PIC NSM). For detailed information on NSMs, see the Network Service Module Hardware Reference.
The PIC bays and the 4-PIC NSM can accommodate combinations of the following PICs (with a maximum of two E1/T1/PRI cards):
■AT-AR020 PRI E1/T1 PIC, one primary rate E1/T1 port
■AT-AR021(S) BRI-S/T PIC, one basic rate ISDN S/T port
■AT-AR021(U) BRI-U PIC, one basic rate ISDN U port
■AT-AR023 SYN PIC, one synchronous port with universal 50-way AMPLIMITE connector
■AT-AR024 ASYN4 PIC, four asynchronous ports with RJ-45 connectors
■AT-AR027 VoIP-FXS PIC, two Foreign Exchange Subscriber (FXS) ports with RJ-11 connectors
Recommendation AT-AR022 ETH PICs and AT-AR026 4ETH PICs are not recommended for use in NSM PIC bays, as performance of these interfaces is likely to be reduced and packet loss may occur. When used with an AR745 router, ETH PICs should be installed in the router’s PIC bay 0 or PIC bay 1.
Asynchronous Ports The two asynchronous serial ports can be used as general purpose ports for terminals, printers or modems. They are effectively identical and can be independently configured. The default communications settings are:
•9600 bps
•8 data bits
•1 stop bit
•no parity
•hardware flow control
PAC Slot AT-AR745 routers have a single PAC slot inside the chassis. When installed, PACs provide hardware-based encryption and or compression capability via a PCI interface. For information on PACs, including a list of compatible PACs, see “PCI Accelerator Cards (PACs)” on page 47.
!Caution PACs should only be installed by authorised service personnel. Unauthorised opening of the router lid may cause danger of injury from electric shock, damage to the router, and invalidation of the product warranty.