Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual page 23

Hardware Reference
C613-03023-00 REV J
3. Remove the PIC-bay face-plate, NSM PIC-bay faceplate, or existing PIC
Loosen the thumbscrews to remove the faceplate or PIC.
Keep the face-plate for future use. If you remove the PIC, replace the face-
plate to prevent dust and debris from entering the switch or router and to
maintain proper airflow.
4. Unpack the PIC
In an antistatic environment, remove the PIC from its packing material. Be
sure to observe ESD precautions.
Do not attempt to install a PIC or any other expansion option without
observing correct antistatic procedures. Failure to do so may damage the switch
or router, PIC, or expansion option. If you are unsure what the 'correct'
procedures are, contact your authorised Allied Telesyn distributor or reseller.
5. If the PIC has jumpers, check that they are correctly set
AT-AR020 PRI E1/T1 and AT-AR021(S) BRI-S/T PICs have user-
configurable jumpers. Check that all jumpers and other hardware
configurations are set correctly on the new PIC
AT-AR026 4ETH PICs have user configurable links that set features such as
auto-negotiation, buffer size, and MAC address aging. Descriptions of the
links can be found in the PIC Hardware Reference.
Table 15: Functions of jumpers on the AT-AR020 PRI E1/T1 PIC board.
Jumper Function
J1 Selects ISDN NT mode (installed, test only) or TE mode (not
installed).
J2 Selects T1 mode (installed) or E1 mode (not installed).
Earlier versions of the AT-AT020 PIC also have a J3 interface jumper. If present,
this jumper must be installed for E1 mode and removed for T1 mode.
Table 16: Functions of jumpers on the AT-AR021(S) BRI-S/T PIC board.
Jumper Function
J1 100Ω termination for TX.
J2 100Ω termination for RX.
Do not attempt to change any jumpers, DIP switches or other hardware
configurations while the switch or router is connected to a power supply,
redundant power supply, or a 'live' network. Dangerous voltages may be
present on some parts of the board, even if the switch or router is not turned on.
6. Slide the PIC into place
PIC bays should be filled in numerical order, starting with the lowest
available bay (e.g., bay 0) followed by bays with progressively higher
numbers.
(Table 15 and Table 16).
Default
Not installed.
Not installed.
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