T1 AND E1 FIBER MUXES
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2. Introduction
2.1 Overview
The T1 and E1 Fiber Muxes (available in 850-nm and 1310-nm versions) combine four T1(1.544 Mbps) or E1
(2.048 Mbps) channels into a single fiber optic link that boasts data rates of either 6.176 Mbps (T1 versions)
or 8.448 Mbps (E1 versions). On the fiber optic side, the multiplexor’s interface gives you a secure link that
communicates in areas susceptible to electromagnetic interference while increasing the maximum connection
range. The fiber interface also protects against the harmful effects of ground loops. The muxes can only be
used in pairs.
The T1 and E1 Fiber Muxes offer these additional features:
• A pair of the 850-nm T1 muxes offers multimode distances of up to 3 km (1.9 miles), and a pair of the
single-mode 1310-nm T1 muxes gives you a maximum range of 48 km (29.8 miles).
• Used in pairs, the E1 muxes offer multimode distances of 4 km (2.5 miles) with the 850-nm model and
single-mode distances of 44 km (27.3) with the 1310-nm model.
• Redundant power supply for all versions.
• Voice service channel for end-to-end communications between maintenance personnel.
• Transmits each of the T1 or E1 channels independently, so each channel can have its own clock source.
• T1 models conform to ITU G.956, G.703, and G.824 standards. E1 models meet ITU G.956, G.703, and
G.823 standards.
Figure 2-1. Typical application showing a pair of local and remote T1 or E1 Fiber Muxes.
(Note that the backup fiber link is possible only by adding an optional redundant fiber link board to each mux.
For more information on this modular board, contact Technical Support.)
Voice
Channel
Connection
Voice
Channel
Connection
ASCII Terminal Linked
to Supervisory Port
ASCII Terminal Linked
to Supervisory Port
(Optional) Backup Fiber Link
Fiber Link
T1 or E1 Channel Links
to Various Devices