Specifications

Copyright © AMETEK
8
8.1 Description
There are three Framer module versions available.
Each is designed for use with a specific
Maintenance Module version.
T1 Framer – MV2 or MV3 (T1 system)
E1 Framer – MV4 (E1 system)
TE1 Framer – MV5 (T1 or E1 selectable, via
jumper on MV5)
8.1.1 Framers Used in T1 Systems
(T1, TE1)
The Framer Module multiplexes the 24 FOCUS
(voice, data, or relay) channels, or time slots, into
one 1.544 Mbps data stream. In doing so, it
provides a multiplexing, or framing, interface
between the transceiver module(s) and the
Maintenance Module.
As an input signal comes in from the transceiver
module, the Framer Module lines it up per channel
(channels 1–24) and puts the information into the
proper frame format. It then sends the framed
information to the Maintenance Module for
processing. After processing the information, the
Maintenance Module sends it back to the Framer
Module at a 2.048 Mbps signal rate, along with
any signals originating in the local chassis. The
Framer Module puts the information into the
proper frame format for transmitting to another
chassis, and then sends it out through the trans-
ceiver module.
The Framer Module has four framers (east, west,
north, and south), also known as T1 ports. Each
framer provides 24 channels, or time slots. The
framing circuitry supports the Extended Super
Frame (ESF) format.
The T1 ports give the module four interfaces for
bi-directional links in the east, west, north, and
south directions. These correspond to transceivers
1-1, 1-2, 2-1, and 2-2, respectively. Each trans-
ceiver provides communications along a T1 line to
the network.
All of these interfaces operate in the same manner,
which allows ESF format users to use the system
in loop operation. All data and control information
is communicated by 2.048 Mbps serial streams
conforming to Mitel’s ST-BUS format.
The ST-BUS is a time division multiplexing
(TDM) serial bus. The serial streams are divided
into 125µs frames of 32 8-bit channels.
The Framer Module’s technical specifications for
T1 are shown in Table 8-1.
8.1.2 Framers Used in E1 Systems
(E1, TE1)
The Framer Module multiplexes the 30 FOCUS
(voice, data, or relay) channels, or time slots, into
one 2.048 Mbps data stream. In doing so, it
provides a multiplexing, or framing, interface
between the transceiver module(s) and the
Maintenance Module.
As an input signal comes in from the transceiver
module, the Framer Module lines it up per channel
(channels 1–30) and puts the information into the
proper frame format. It then sends the framed
information to the Maintenance Module for
processing. After processing the information, the
Maintenance Module sends it back to the Framer
Module at a 2.048Mbps signal rate, along with
any signals originating in the local chassis. The
Framer Module puts the information into the
proper frame format for transmitting to another
chassis, and then sends it out through the trans-
ceiver module.
The Framer Module has four framers (east, west,
north, and south), also known as E1 ports. Each
framer provides 30 channels, or time slots.
The E1 ports give the module four interfaces for
bi-directional links in the east, west, north, and
south directions. These correspond to transceivers
1-1, 1-2, 2-1, and 2-2, respectively. Each trans-
8. Framer Module