Understanding Channelized Interface Clear Channels
Each port on a channelized T1/E1/ISDN PRI PIM is software configurable as a T1 or E1 clear channel. You can partition each port into up to 24 DS0 channels on a T1 interface or up to 31 DS0 channels on an E1 interface, and can insert channels from one port into another with the drop-and-insert feature. Channelized T1/E1/ISDN PRI ports can also be partitioned into channels for ISDN PRI service.
 | Note: When you configure a T1-specific or an E1-specific interface on the SRX-GP-QUAD-T1-E1 or SRX-GP-DUAL-T1-E1, the line encoding and the framing must be specified under the ct1-n/n/n interface, whereas the remaining T1 or E1 specific configuration items must be configured under the t1-n/n/n or e1-n/n/n interface, respectively. Channelized T1/E1/ISDN PRI ports can also be partitioned into channels for ISDN PRI service. |
You configure the following interface options:
- Use the device’s system clock (internal) instead of a signal received from the T1 or E1 interface (external) as the transmit clock source.
- Label the physical interface (description).
- Delay the advertisement of interface transitions (hold time) from up to and down to 500 milliseconds. Additionally, set the link hold-up time to 500 milliseconds.
- Use the interface as a single clear channel (no partition).
- Use subunit queuing on Frame Relay or VLAN IQ interfaces (per-unit-scheduler).
- Set E1 or T1 options: BERT algorithm, error rate, and period, and line buildout range, framing mode, and loopback mode.
