Cisco 7000 Series Hardware Installation And Maintenance Manual page 45

The FSIP can be configured to support up to eight E1-G.703/G.704 ports (four ports per module, two
modules per FSIP). FSIP bandwidth can be allocated by the user, and the maximum aggregate
bandwidth per four-port module is 16 Mbps, full duplex. We recommend that you leave one port on
each module shut down to avoid exceeding this 16-Mbps maximum per module. Each of the four
interfaces can operate up to 2.048 Mbps, which potentially presents a load greater than 16 Mbps, full
duplex, if all four interfaces are configured. Eight E1-G.703/G.704 ports can be supported up to the
16-Mbps aggregate bandwidth capability; however, it is not possible to simultaneously support eight
E1-G703/G.704 ports at 100-percent peak bandwidth utilization, without exceeding the 16-Mbps
maximum per module.
Two versions of the E1-G.703/G.704 interface are available: one supports balanced mode, and the
other supports unbalanced mode. Neither the modes nor the cables are interchangeable; you cannot
configure a balanced port to support an unbalanced line, nor can you attach an interface cable
intended for a balanced port to an unbalanced port.
The FSIP E1-G.703/G.704 interface supports both framed and unframed modes of operation, a
loopback test, and a four-bit cyclic redundancy check (CRC). The interface can operate with either
a line-recovered or an internal clock signal. The FSIP is configured at the factory with from one to
four E1-G.703/G.704 port adapters. Each port adapter provides two 15-pin D-shell (DB-15)
receptacles, which support only E1-G.703/G.704 interfaces.
The FSIP E1-G.703/G.704 interface uses a DB-15 receptacle for both the balanced and unbalanced
ports. The label adjacent to the port indicates whether the port is balanced or unbalanced; you must
connect the correct type of interface cable, or the port will not operate.
Figure 1-20 shows the 15-pin port and the label that indicates either balanced or unbalanced mode.
Figure 1-20 FSIP E1-G.703/G.704 Port Adapter
E1-G.703/G.704
The FSIP end of all E1-G.703/G.704 adapter cables is a 15-pin D-shell connector (DB-15). At the
network end, the adapter cable for unbalanced connections uses a BNC connector. The adapter
cables for balanced mode are available with several connector types to accommodate connection
standards in different countries. You must use the proprietary cables to connect the E1-G.703/G.704
port to your network.
Cables for balanced and unbalanced mode are available with the following types of network-end
connectors:
•
Balanced (120-ohm) twinax split at the network end, with separate transmit and receive cables,
each with a BNC connector
•
Balanced (120-ohm) cable with a DB-15 connector at the network endU
•
Unbalanced (75-ohm) coax with BNC connectors at the network end (used primarily for
connection in the United Kingdom)
In addition, some connections require bare-wire connections (directly to terminal posts).
Table 1-6 lists the model numbers and descriptions of the E1-G.703/G.704 port adapters and cables.
Physical Description
Product Overview 1-31