87
Supported services
• Backup
• Terminal access service
• ISDN PRI
Interface LEDs
Figure 101 HMIM-8E1 (75-ohm) panel
Figure 102 LED description
LINK/ACT
• On means carrier signal has been received.
• Flashing means data is being received or/and transmitted.
• Off means no carrier signal has been received.
LP/AL
• On means the interface is in a loopback.
• Off means no loopback or alarm is present.
• Flashing means an alarm indication signal (AIS), loss of frame alignment
(LFA) signal, or remote alarm indication (RAI) signal is present.
Interface cables and connection methods
For more information about E1 interface cables, see "E1 interface."
HMIM-2T1/HMIM-4T1-F
Introduction
The 2-port channelized CT1/PRI interface module (HMIM-2T1) transmits, receives, and handles T1
data streams. In addition, you can use the module for CT1 access and ISDN PRI.
The 4-port fractional T1 interface module (HMIM-4T1-F) differs from the HMIM-CT1 module in the
following ways:
• FT1 operating mode supported by T1-F modules allows only one bundle. The time slots can
only be bundled into one n × 64 Kbps/56 Kbps channel, where the value range of n is 1 to 24.
However, a CT1 module allows of arbitrary grouping of the 24 channels.
• T1-F does not support the PRI mode.
For a T1 module, the system automatically creates a serial interface for each timeslot bundle formed
on a controller T1 interface.
Interface specifications
Table 138 Interface specifications
Connector type RJ45
Number of connectors
• 2 (HMIM-2T1)
• 4 (HMIM-4T1-F)
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