Allied Telesis AT-AR040, Справочник по аппаратуре

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Hardware Reference 7
C613-03022-00 REV F
AT-AR040 NSM
The AT-AR040 provides four Port Interface Card (PIC) slots (Figure 2 on
page 7).
Figure 2: AT-AR040 NSM with three PICs.
This NSM supports combinations of the following PICs (with a maximum of
two E1/T1/PRI cards):
• AT-AR020 PRI E1/T1 (Primary Rate ISDN)
1
• AT-AR021 (S) BRI-S/T (Basic Rate ISDN S/T)
• AT-AR021 (U) BRI-U (Basic Rate ISDN U)
• AT-AR023 SYN (Synchronous RS-232/X21/V35 DCE/DTE to 2Mps)
• AT-AR024 ASYN4 (Four Asynchronous ports)
1. Up to two PRI E1/T1 PIC cards (AT-AR020) can be installed in the NSM. A
maximum of 32 TDM slots are allowed in each NSM row, and the maximum
aggregate bandwidth for each row is 2.6 Mbps. If two PRI E1/T1 PICs are
installed, the first must be in the lower row (bay 0 or 1), and the second must be
in the upper row (bay 2 or 3). If an AT-AR020 E1/T1 PRI PIC is installed in one
of the rows in the NSM and operating in E1 mode, then this row cannot also
have an AT-AR021(S) BRI-S/T PIC or an AT-AR021(U) BRI-U PIC installed.
AT-AR022 ETH PICs and AT-AR026 4ETH PICs are not recommended for use in the
NSM PIC bays, as performance of these interfaces is likely to be reduced and packet loss
may occur.
Interface numbering for AT-AR040 NSMs
Interface numbering for each interface type (e.g., BRI, PRI, SYN, ETH, PORT)
begins at 0 on the base switch or router and continues until all interfaces of that
type on the base unit are numbered. For AR700 Series routers, the numbering
then continues with the PIC interfaces installed directly in the router’s PIC
bays, starting at PIC bay 0. For switches and routers, the numbering then
continues with the interfaces installed in the NSM, starting with NSM PIC bay
0, and ending with NSM PIC bay 3.
It is recommended that PICs be installed in the router’s PIC bays and NSM’s
PIC bays in the above sequential order, so that interface numbering is not
changed when a new PIC is installed.
nsm4pic3
ASYN
3 0
SYN
Tx
Rx
AT-AR
023
SYN PIC
Blank face-plate
AT-AR
020
PRI E
1
/T
1
PIC
AT-AR
024
ASYN
4
PIC
Active D Data
B Data
PRI E1/T1
N