85 
•  HMIM-4T1-F 
•  HMIM-8E1T1 
•  HMIM-8E1T1-F 
HMIM-2E1/HMIM-4E1/HMIM-4E1-F 
Introduction 
The 2-port channelized E1/PRI interface module  (HMIM-2E1) and 4-port channelized E1/PRI 
interface module (HMIM-4E1) transmit, receive, and process E1 data traffic. In addition, you can use 
these modules for CE1 access and ISDN PRI. 
The HMIM-4E1-F module is different from the HMIM-4E1 module in the following ways: 
•  The FE1 operating mode supported by the E1-F module allows only one n × 64 Kbps bundle to 
be formed on each interface, where the value range of n is 1 to 31. However, an E1 module 
allows arbitrary grouping of 31 channels and multiple bundles. 
•  The E1-F modules do not support the PRI mode. 
Interface specifications 
Table 135 Interface specifications 
Connector type  DB15  DB25 
Number of 
connectors 
2  1 
Interface 
standard 
G.703 and G.704 
Interface rate  2.048 Mbps 
Cable type 
•  E1 75-ohm unbalanced coaxial cable 
•  E1 120-ohm balanced twisted pair cable 
•  120-ohm 4E1 conversion cable (only supported by the HMIM-4E1/HMIM-4E1-F) 
•  75-ohm 4E1 conversion cable (only supported by the HMIM-4E1/HMIM-4E1-F) 
•  Coaxial connector, network interface connector, and 75-ohm to 120-ohm adapter 
(with BNC connector) 
Operating mode 
•  E1, CE1, ISDN PRI (only supported by the HMIM-2E1/HMIM-4E1) 
•  FE1 (only supported by the HMIM-4E1-F) 
Supported 
services 
•  Backup 
•  Terminal access service 
•  ISDN PRI (only supported by the HMIM-2E1/HMIM-4E1) 
 
Interface LEDs 
Figure 98 HMIM-2E1 panel 
 
 
Figure 99 HMIM-4E1 panel