IMG 1010 - Rear Panel Description (DS3 Backup)

Illustration:

Overview:

The above diagram illustrates the layout of the rear panel on the IMG 1010 DS3 (Backup I/O). An IMG 1010 with the Backup I/O is utilized in an N+1 redundancy scheme. The N+1 redundancy scheme on the IMG 1010 allows up to six IMG 1010's with DS3 Primary I/O to be backed up by one Backup I/O. If at any time one of the IMG 1010's with the Primary I/O fails, the backup node will get configured with the file used to initially configure the failed unit. The DS3 Backup I/O is used as a Backup Node only.

CTRL 0, CTRL 1 - 10/100  (Communication to GCEMS)

The Backup Node will communicate with the GCEMS server using the CTRL 0 and CTRL 1 interfaces on the Backup node. Once the CTRL0 and CTRL 1 interfaces become active they provide communication with an external GCEMS or other device that needs to be secure from the public network. The connectors do not interface with the internal Ethernet switch and are physically isolated from any network internal to the IMG 1010 . These auto-negotiating, full duplex connectors support MDIX (cable cross-over) which eliminates the need for crossover cables for point-to-point connections.

DATA 0, DATA 1 - 10/100/1000 (Data and Signaling over IP)

The DATA 0 and DATA 1 interfaces are initially configured to be in a backup/standby state. Once one of the Primary Nodes fails, the DATA 0 and DATA 1 interfaces become active and are then configured with the same IP address as the failed unit. Once the DATA 0 and DATA 1 interfaces become active they are used to communicate over the public network. All internal connections are 10/100BaseT and are aggregated to 1000BaseT, if required. These auto-negotiating, full duplex connectors support MDIX (cable cross-over) which eliminates the need for crossover cables for point-to-point connections.

SIG 0, SIG 1 - 10/100 (Signaling over IP)

The SIG 0 and SIG 1 interfaces are initially configured to be in a backup/standby state. Once one of the Primary Nodes fails, the SIG 0 and SIG 1 interfaces become active and are then configured with the same IP address as the failed unit. Once the SIG 0 and SIG 1 interfaces become active they can be used as connections to the data network. These two redundant 10/100BaseT Ethernet connectors interface to the internal Ethernet switch and can be either logically isolated from the data network or can be used to bring in signaling over IP. These auto-negotiating, full duplex connectors support MDIX (cable cross-over) which eliminates the need for crossover cables for point-to-point connections.

Signaling/Timing Ports 0 - 3 (T1/E1 Signaling and Timing Span Connectors)

The four Signaling/Timing interfaces are not redundant. Resources configured on the DS3 primary node will be lost if a switchover occurs.

BEARER Tx/Rx BNC Connectors:

Located on the rear panel of the DS3 Backup I/O are six bnc connectors. The connectors are laid out in Tx/Rx pairs. There are six Tx/Rx pairs so the DS3 Backup I/O can be a backup for each of the Primary DS3 units in the network. Once one of the primary nodes fails the Tx/Rx BNC pair on the rear of the backup unit will take over. Any calls that are in process will be lost. See IMG 1010 - N plus 1 DS3 Overview for more information on setting up the N+1 network.

Additional DS3 Bearer Information:

A DS3 line (also known as a T-3) is an ultra high-speed connection capable of transmitting data at rates up to 45 Mbps. A DS3 line is equal to approximately 672 regular voice-grade telephone lines and supports a DS3 signaling interface which is bipolar with Bit 3 Zero Substitution (B3ZS). The DS3 interface is a 75 ohm coax cable and must be made with true 75 ohm cable and connectors. The DS3 interface supports either T1 or E1 protocol but not both on same Physical IMG 1010. Support for either T1 or E1 Protocol is based on the value of the Host Flag setting in the dhcpd.conf file. See IMG 1010 - Setting Host Flags for more information on setting host flags.

Timing on Bearer Spans:

Any Bearer Span 0-27 (T1, E1, or a DS1 on a DS3) can be configured to accept a Primary or Secondary Loop Timing Source.
 

T1 Protocol on DS3 line (1.544 Mbps)

• Supports up to 672 DS3 Channels (28 Spans * 24 DS0's)

• Supports configuring 4 signaling spans as well (4 Spans * 24 DS0's)
   

E1 Protocol on DS3 line (2.048 Mbps)

• Supports up to 672 DS3 Channels (21 Spans * 32 DS0's)

• Supports configuring 3 signaling spans as well (3 Spans * 32 DS0's)
   

Ethernet Control, Signaling and Data Connector LEDs:

These Ethernet RJ-45 connectors contain two LEDs that provide the user with Ethernet status.

The figure below shows the RJ-45 Ethernet connector LEDs.