Juniper Networks J-series Services Router J2320 - Manual (Page 80)

■ Maximum MTU value of 4500 bytes (for channelized T1 or E1 interface) and
4098 bytes (for ISDN PRI services)
NOTE: For a clear-channel T1 or E1 interface, the maximum MTU is 9150 bytes.
■ 56-Kbps and 64-Kbps modes
■ ANSI T1.102, T1.107, and T1.403 standards compliance
■ G.703, G.704, and G.706 E1 standards compliance
■ Independent internal and external clocking system
■ Loopback, bit error rate test (BERT), T1 facilities data link (FDL), and long buildout
diagnostics
For pinouts of cable connectors for channelized T1/E1/ISDN PRI PIMs, see “ISDN
RJ-45 Connector Pinout” on page 239.
To install or remove a PIM, see “Replacing a PIM” on page 172.
Channelized T1/E1/ISDN PRI LEDs indicate PIM and port status. Table 27 on page
58 describes the meaning of the LED states.
NOTE: The STATUS LED displays channelized T1 or E1 port activity and alarms only.
It does not display ISDN PRI B-channel or D-channel status.
Table 27: LEDs for Channelized T1/E1/ISDN PRI PIMs
Description State Color Label
PIM is online and
operational. On steadily Green ONLINE
PIM is not online. Off Unlit
Port is online with no
alarms or failures, and
the physical layer is
active. On steadily Green STATUS
Port is active with a
local alarm. The
router has detected a
failure and the
physical layer is
inactive. Online Red
Port is online with
alarms for remote
failures. Online Yellow
Port is disabled. Offline Unlit
58 ■ Field-Replaceable PIMs
J2320, J2350, J4350, and J6350 Services Router Getting Started Guide