48 port switch options are available from Acumen Technologies .
The Cisco 3850 48 Port switch with 10G Fiber connectivity rates very favourably for enterprise environments
email craig@acumentech.co.za for pricing
When it comes to 48 port switches, Cisco rates highly.
WS-C3850-48XS-S

Product Overview

   Integrated wireless controller capability with:

    Up to 40G of wireless capacity per switch (48-port RJ45 models)

    Support for up to 100 access points and 2000 wireless clients on each switching entity (switch or stack)

   24 and 48 10/100/1000Mbps data PoE+ and Cisco UPOE models with energy-efficient Ethernet (EEE)

   24 and 48 100Mbps/1/2.5/5/10 Gbps Cisco UPOE models with energy-efficient Ethernet (EEE)

   12- and 24-port 1 Gigabit Ethernet SFP-based models

   12- and 24-port 1/10 Gigabit Ethernet SFP+-based models

   48-port 1/10 Gigabit Ethernet SFP+ model with 4 fixed 40 Gigabit Ethernet QSFP+ uplinks

   Cisco StackWise-480 technology provides scalability and resiliency with 480 Gbps of stack throughput[1]

   Cisco StackPower technology provides power stacking among stack members for power redundancy1

   Five optional uplink modules[2] with 4 x Gigabit Ethernet, 2 x 10 Gigabit Ethernet, 4 x 10 Gigabit Ethernet[3], 8 x 10 Gigabit Ethernet4, or 2 x 40 Gigabit Ethernet QSFP+[4] ports

   Dual redundant, modular power supplies and three modular fans providing redundancy

   Full IEEE 802.3at (PoE+) with 30W power on all copper ports in 1 rack unit (RU) form factor

   Cisco UPOE with 60W power per port in 1 rack unit (RU) form factor

   Software support for IPv4 and IPv6 routing, multicast routing, modular quality of service (QoS), Flexible NetFlow (FNF), and enhanced security features

   Single universal Cisco IOS® Software image across all license levels, providing an easy upgrade path for software features

   Enhanced limited lifetime warranty (E-LLW) with next business day (NBD) advance hardware replacement and 90-day access to Cisco Technical Assistance Center (TAC) support

Detailed specification