E1-G.703/G.704 Port Adapter - Cisco 7000 Hardware Installation And Maintenance

Physical Description
Because the adapter cable determines the electrical interface type and mode of each port, you only
need to change a cable to change the interface type or mode of a port. For example, you can change
an interface from an EIA/TIA-232 to a V.35 by replacing the adapter cable, or change the mode of
an EIA/TIA-232 DTE port by replacing the EIA/TIA-232 DTE cable with an EIA/TIA-232 DCE
cable. DCE mode is the default on all ports; however, you must set the clock rate on all DCE ports
with the clockrate command.
The FSIP is shipped from the factory with two or four port adapters installed. Additional port
adapters are available as spares so that you can replace one that fails; however, you cannot upgrade
a four-port FSIP to an eight-port by adding port adapters.
(The four-port FSIP is manufactured with only one four-port module and processor.) For port adapter
replacement instructions, refer to the section "Replacing Serial Port Adapters" in the chapter
"Maintenance." The appendix "Cabling Specifications" provides adapter cable pinouts. However,
because the FSIP uses a special, high-density port that requires special adapter cables for each
electrical interface type, we recommend that you obtain serial interface cables from the factory.

E1-G.703/G.704 Port Adapter

The FSIP E1-G.703/G.704 interface connects Cisco 7000 series routers with 2.048-Mbps leased line
services. The interface eliminates the need for a separate, external data termination unit to convert a
standard serial interface (such as V.35) to a G.703/G.704/G.732 interface.
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.
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