Juniper J2300 Getting Started Manual page 76

J2300, J4300, and J6300 Services Router Getting Started Guide
Figure 27: Channelized T1/E1 PIM
The Dual-Port Channelized T1 or E1 PIM provides the following key features:
NOTE: For a clear-channel T1 or E1 interface, the maximum MTU is 9150 bytes.
For pinouts of cable connectors for channelized T1 and E1 PIMs, see
"E1 and T1 RJ-48 Cable Pinouts" on page 211.
For alarms, see the configuring and monitoring alarms information in
the J-series Services Router Administration Guide.
For installing and removing a PIM, see "Replacing a PIM" on page 164.
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Field-Replaceable PIMs
Onboard network processor
Two-port channelization
Interfaces that are software configurable as T1 or E1
Clear-channel, fractional, and channelized operation
Lower latency due to the addition of a Freescale processor
Maximum MTU value of 4500 bytes (for channelized T1 or E1 interface)
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