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12 AR700 Series Router
C613-03087-00 Rev E
PIC bays and NSM
bay
The AT-AR745 chassis has two PIC bays. A further four PIC bays can be added
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.