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Introduction
The
versatility of Cisco® 2610-51XM, 2691,
3660, and 3700 series routers is demonstrated
by their broad support of E1/ T1 connectivity
and Integrated Services Digital Network Primary
Rate Interfaces (ISDN PRI). Customers continue
to deploy E1 and T1 circuits for Wide Area
Network (WAN) connectivity, ISDN dial-backup,
and digital modem termination in the Power
Branch Office Environment. Cisco now makes
it possible to terminate T1 and E1 PRI connections
in a single network module. Available in single
and dual port models, the NM-1CE1T1-PRI and
NM-2CE1T1-PRI cards coupled with Cisco 2610-51XM,
2691, 3660, and 3700 Series routers, enhance
and simplify customers’ WAN connectivity
options (Figure 1). The Cisco E1/T1 ISDN PRI
Network Module’s integrated channel service
unit (CSU) provides direct connection to the
telecommunications network, thus allowing
customers to consolidate customer premises
equipment (CPE). This provides multifunction
dial access aggregation, routing functionality,
VPN and firewall security, and other capabilities
right inside the Cisco router in power branch
office environments. Both the 1-port and 2-port
versions offer support for balanced and unbalanced
E1 connectivity and conform easily to customers’
specific applications. The Cisco E1/T1 ISDN
PRI network modules also supply connectivity
for internal digital modems in the Cisco 3660
and 3700 series routers, with connectivity
options for PRI, T1 channel associated signaling
(T1-CAS), and E1-CAS R2 signaling. This provides
for a high concentration of V.92-compatible
modems, while still allowing expandability
for other critical services.
Features
- Cisco
IOS® Software configurable for T1 or
E1 operation
- Balanced
or unbalanced E1 termination in the same
module
- Integrated
CSU/DSU (channel service unit / data service
unit) per port
- Full
or fractional E1/T1 - can be fully channelized
- Supports
PRI for data, T1-CAS, and E1-CAS R2 signaling
- E1
unframed and framed modes (G.703/G.704)
available
- Interoperates
with NM-xDM digital modem network modules
- Bantam
(tty) jacks for easy network monitoring
- V.54
loopback compatible
- Supported
on Cisco 2610-51XM, 2691, 3660, and 3700
Series routers
- Online
insertion and removal (OIR) supported on
Cisco 3660 and 3745 routers
- On-board
expansion slot for future technologies
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