Allied Telesis AT-AR021 BRI-U Руководство по установке - Страница 7

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Unpack the PIC.

In an antistatic environment, remove the PIC from its packing material. Be sure

to observe ESD precautions.

Warning 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 Telesis distributor or

reseller.

If the PIC has jumpers, check they are correctly set.

Warning 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 turned off.

AT-AR020 PRI E1/T1 and AT-AR021(S) BRI-S/T PICs have user-configurable

jumpers. Check all jumpers are set correctly on the new PIC, as shown in

Table 1

jumper. If present, this jumper must be installed for E1 mode and removed for

T1 mode. The AT-AR021(S) V2 hardware revision, identified by the label

"AR021 V2" on the board, supports both TE and NT mode. Jumper J4, when

installed, selects NT mode. The PIC should be configured as a TE for normal

operation.

Table 1: Functions of jumpers on the AT-AR020 PRI E1/T1 PIC board

Jumper

Table 2: Functions of jumpers on the AT-AR021(S) BRI S/T PIC board

Jumper

and

Table

2. Early versions of the AT-AR020 PIC also have a J3 interface

Function

ISDN NT mode (installed, test only) or

TE mode (not installed).

T1 mode (installed) or E1 mode (not installed).

E1 mode (installed) or T1 mode (not installed).

Only present on earlier versions of the PIC.

Function

100Ω termination for TX.

100Ω termination for RX.

ISDN NT mode (installed) or TE mode (not

installed). Only present on V2 hardware revision

of PIC.

Port Interface Card

Default

Not installed.

Installed.

Default

Not installed.